Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Merdan, Mehmet(9)
- Yildirim, Ahmet(7)
- Gezen, Cem(5)
- Memetoglu, Mehmet Erdem(5)
- Oncel, Mustafa(5)
- Altuntas, Yunus E.(4)
- Duran, Celal(4)
- Kement, Metin(4)
- Kömürcü, Murat Ihsan(4)
- Okkabaz, Nuri(4)
- Vural, Selahattin(4)
- Akkan, Yasar(3)
- Akpinar, Adem(3)
- Aksakal, Nihat(3)
- Ashyralyyev, Charyyar(3)
- Ayaydin, Hasan(3)
- Cakir, Zafer(3)
- Can, İbrahim(3)
- Cihan, Hamit(3)
- Gökdogan, Ahmet(3)
- Gökdoǧan, Ahmet(3)
- Kalkan, Asim(3)
- Kaya, Elif Çelenk(3)
- Kaygusuz, Abdullah(3)
- Kuzudisli, Ali(3)
- Maden, Nafiz(3)
- Orhan, Salih(3)
- Sipahi, Ferkan(3)
- Ural, Dilek(3)
- Çatak, Adem(3)
- Adanur, Suleyman(2)
- Akbulut, O.(2)
- Akkan, Yaşar(2)
- Akpinar, A.(2)
- Aksakal, V.(2)
- Aksakal, Vecihi(2)
- Alemdag, Selcuk(2)
- Altunisik, Ahmet Can(2)
- Arslan, Mehmet(2)
- Ashyralyev, A(2)
Yayınlar
- MakaleYalnız künye2012Coupling of homotopy perturbation, Laplace transform and Padé approximants for nonlinear oscillatory systems
Merdan, Mehmet; Yildirim, Ahmet; Gökdogan, Ahmet; Mohyud-Din, Syed Tauseef
In this article, homotopy perturbation method coupled with Laplace transform and Padé 0approximants is applied on the re-formulated nonlinear oscillatory systems. Numerical results and graphical represenations explicitly reveal the complete reliability and effeicincy of the suggested algorithm.
- MakaleYalnız künye2012A multistage differential transformation method for approximate solution of Hantavirus infection model
Gökdoĝan, Ahmet; Merdan, Mehmet; Yildirim, Ahmet
The goal of this study is presented a reliable algorithm based on the standard differential transformation method (DTM), which is called the multi-stage differential transformation method (MsDTM) for solving Hantavirus infection model. The results obtanied by using MsDTM are compared to those obtained by using the Runge-Kutta method (R-K-method). The proposed technique is a hopeful tool to solving for a long time intervals in this kind of systems.
- MakaleAçık Erişim2012Results after multivisceral resections of locally advanced colorectal cancers: An analysis on clinical and pathological t4 tumors
Gezen, Cem; Kement, Metin; Altuntas, Yunus E.; Okkabaz, Nuri; Seker, Mesut; Vural, Selahattin; Gumus, Mahmut; Oncel, Mustafa
Background: Locally advanced colorectal cancers are best treated with multivisceral resections. The aim of this study is to evaluate early and late results after multivisceral resections.Methods: All patients operated for primary colorectal cancer between 2001 and 2010 were -reviewed. These were compared within the patients underwent single organ and multivisceral resections: demographics, tumor and procedure related parameters, perioperative results, early oncological outcomes and 5-year survival.Results: A total of 354 patients (59.6 ± 13.8 years old, 210 [59.3%] males) were abstracted. Ninety (25.4%) patients underwent multivisceral resections for clinical T4 tumors and en-bloc R0 resection was achieved in 82 (91.1%). Only 31 (34.4% and 8.8% of clinical T4 and all cancers, respectively) cases had actual adjacent organ invasions (pT4). Males (20%) had lower risk for locally advanced tumors than females (33.3%) (p < 0.05). PT4 cancers were more common, if the clinical T4 tumor is located in the colon (48.8% vs 21.3%; p < 0.01). Laparoscopy was seldom initiated and the risk of conversion was higher in clinical T4 tumors (p < 0.05). The rates of sphincter-saving procedures were not different. Operation time, bleeding and transfusion requirements increased when multivisceral resections were necessitated (p < 0.05), but hospital stay, complications and 30-day mortality rates were similar. The 5-year survival rates were identical (p > 0.05).Conclusions: Clinical T4 tumors are not rare and more common in women. An actual invasion (pT4) may be observed in one third of all clinical T4 tumors, and more frequent in colon cancers. An en-bloc, R0, multivisceral resection may be achieved in most cases. Multivisceral resections do not alter the rates of sphincter-saving procedures, morbidity and 30-day mortality; do not worsen survival but increase operation time, intraoperative bleeding and perioperative transfusion requirements.
- MakaleYalnız künye2012A multistage variational iteration method for approximateanalytic solution of avian-human influenza epidemic model
Gökdoǧan, Ahmet; Merdan, Mehmet; Ertürk, Vedat Suat
In this paper, the approximate solution of avian-human influenza epidemic model is obtained by a reliable algorithm based on an adaptation of the standard variational iteration method (VIM), which is called the multi-stage variational iteration method (MVIM). A comparison between MVIM and the Runge-Kutta method (RK-method) reveals that the proposed technique is a promising tool to solve the considered problem.
- MakaleYalnız künye2012Aggression and violence towards health care providers, and effects thereof
Eker, Hasan Hüseyin; Özder, Aclan; Tokaç, Mahmut; Topçu, Ibrahim; Tabu, Abdulkadir
Objectives. This study aims to examine the frequency of exposure of health care providers to aggression and violence at work, and the effective factors thereon, as well as the effects of violence on health care providers. Materials and Methods. This cross-sectional type study has been conducted in Istanbul Training and Research Hospital (IEAH) (219) and Bayrampasa State Hospital (BDH) (64) in April 2010. The questionnaire prepared by researchers has been filled in through face-to-face meetings with a total of 283 health care providers, who accepted to take part in the study. The resulting data have been assessed and evaluated through SPSS 11.5 package program. Results. 66.8% of the respondents reported that they had been exposed to violence and aggression during the recent one year, the most frequent type thereof being verbal violence (86.8%). 90.2% of the health care providers exposed to violence at work stated that the applicable current laws do not protect the staff against violence, and 88.3% thereof stated that their institution have not supported them upon an act of violence. A statistically significant difference in the frequency of exposure to violence has been detected between age, seniority at work, place of exposure to violence, and profession of the health care staff (p<0.05). Approximately half of the health care providers opine that their behavior towards patients has been negatively affected from violence. It is noted that such negative behavior change is even higher in females, staff with a frequency of violence > 5, assistants, and staff who believe that security at work is at risk in their institution (p<0.05). Conclusions. Around 1/3rd of the health care providers have reported that they have been exposed to violence at least once during the recent one year, and half of those exposed to violence have stated that their behavior towards patients has been negatively affected therefrom.
- MakaleAçık Erişim2012On the solutions fractional Riccati differential equation with modified Riemann-Liouville derivative
Merdan, Mehmet
Fractional variational iteration method (FVIM) is performed to give an approximate analytical solution of nonlinear fractional Riccati differential equation. Fractional derivatives are described in the Riemann-Liouville derivative. A new application of fractional variational iteration method (FVIM) was extended to derive analytical solutions in the form of a series for these equations. The behavior of the solutions and the effects of different values of fractional order α are indicated graphically. The results obtained by the FVIM reveal that the method is very reliable, convenient, and effective method for nonlinear differential equations with modified Riemann-Liouville derivative
- MakaleYalnız künye2012The role of group education on quality of life in patients with a stoma
Altuntas, Y.E.; Kement, M.; Gezen, C.; Eker, H.H.; Aydin, H.; Sahin, F.; Okkabaz, N.; Oncel, M.
Stoma education has been traditionally given in a one-to-one setting. Since 2007, daily group education programmes were organised for stoma patients and their relatives by our stoma therapy unit. The programmes included lectures on stoma and stoma care, and social activities in which patients shared their experiences with each other. Patients were also encouraged to expand interaction with each other and organise future social events. A total of 72 patients [44 (61.1%) male with a mean (±SD) age of 56.8 ± 13.6 years] with an ileostomy (n= 51, 70.8%), a colostomy (n= 18, 25.0%) or a urostomy (n= 3, 4.2%) were included in the study. Patients were asked to answer a survey (SF-36) face-to-face before the initiation of the programme, which was repeated 3 months later via telephone call. The comparison of pre-education and post-education SF-36 scores revealed a statistically significant improvement in all 8-scale profiles, but not in vitality scale, and both psychometrically-based and mental health summary measures. Analyses disclosed that married patients and those who were living at rural districts seem to have the most improvement in life quality particularly in bodily pain, general health and role-emotional scales and mental health summary measure. In our opinion, group educations may be beneficial for stoma patients, and stoma therapy units may consider organising similar activities.
- MakaleAçık Erişim2012Stability of difference schemes for fractional parabolic PDE with the Dirichlet-Neumann conditions
Cakir, Zafer
The stable difference schemes for the fractional parabolic equation with Dirichlet and Neumann boundary conditions are presented. Stability estimates and almost coercive stability estimates with ln (1 / ( + | h |)) for the solution of these difference schemes are obtained. A procedure of modified Gauss elimination method is used for solving these difference schemes of one-dimensional fractional parabolic partial differential equations.
- MakaleYalnız künye2012The determinations of fruit features in the Tombul hazelnut (Corylus avellana L.) clone
Kalkişim, Özgün; Balik, Hüseyin Irfan
This study was carried out between Çarşi{dotless}başi{dotless}/Trabzon and Piraziz/Giresun region which is assumed to be the best ecology for Tombul hazelnut cultivation. Visual pre-selection was performed in the region and the clones that may exhibit different characteristics were detected and marked. Later fruit samples were taken from those clones at the time of harvest and the superior clones were determined as a result of the examinations performed on the fruits. The efficiency and fruit features were analyzed for selected Tombul hazelnut clones. The study showed that the differences between efficiency, yield, kernel weight, fruit weight, shell thickness and bundle fruit number were significant (P<0.05) among Tombul hazelnut clones. On the other hand, differences of navel cavity, splitting fruit ratio, whitening and healthy kernel ratio among clones were not significant. The highest and lowest values of efficiency were 13.45 and 168.47 g/cm2, respectively, for clones 61V11 and 28M16, yield was 45.11-54.07%, respectively, for clones 61V11 and 28M17, kernel weight 0.89-1.19 g, respectively, for clones 61V11 and 28G16, fruit weight 1.67-2.19 g, respectively, for clones 61B08 and 28ES04, shell thickness 0.89-1.10 mm, respectively, for clones 28G08 and 28ES04 and bundle fruit number 2.15-4.38, respectively, for clones 61B08 and 28EY12. The clones 28ES01 (53.86), 61Ç07 (53,88%), 61V25 (53.90%) and 28M17 (54.07%) had more superior characteristics in terms of yield compared to others.
- MakaleYalnız künye2012Effects of plant growth-promoting rhizobacteria on some morphologic characteristics, yield and quality contents of Hungarian vetch
Yolcu, Halil; Gunes, Adem; Gullap, M.Kerim; Cakmakci, Ramazan
This research study was designed to determine the effects of plant growth-promoting rhizobacteria (PGPR) on some morphological characteristics, yield and quality contents of Hungarian vetch (Vicia pannonica Crantz.) in the Kelkit Aydi{dotless}n Dogan Vocational Training School Research Area during 2008-2009 and 2009-2010 plant growing season. The research consisted of a control (without plant growth-promoting rhizobacteria) and 12 different plant growth-promoting rhizobacteria (Pseudomonas putida PPB310, Bacillus cereus BCB51, Pantoea agglomerans PAB58, Pseudomonas fluorescens PFC82, Pseudomonas fluorescens PF84, Arthrobacter mysorens AM235, Paenibacillus polymyxa PP315, Pantoea agglomerans PAA362, Bacillus atrophaeus BA361, Bacillus megaterium BMA424, Bacillus megaterium BMA479 and Bacillus subtilis BS521) seed inoculations and three replicates. Some morphological characteristics (stem diameter, plant height and leaf number), dry matter yield, crude protein, crude protein yield, ADF, NDF, macro and micro-elements (B, Ca, Na, K, Mg, P, S, Cu, Fe, Mn and Zn) were tested in the research study. According to the results of the research study, some of the PGPR treatments had positive effect on morphological characteristics (especially PFC82, BA361 and PAB58), dry matter yield (very little PAA362), crude protein (very little PFC82), ADF and NDF (especially BA361) and macro and micro-elements (especially PAA362) of Hungarian vetch.
- MakaleYalnız künye2012Geochronological evidence and tectonic significance of Carboniferous magmatism in the southwest Trabzon area, eastern Pontides, Turkey
Kaygusuz, Abdullah; Arslan, Mehmet; Siebel, Wolfgang; Sipahi, Ferkan; Ilbeyli, Nurdane
The northern and southern zones of the eastern Pontides (northeast Turkey) contain numerous plutons of varying ages and compositions. Geochemical and isotopic results on two Hercynian granitoid bodies located in the northern zone of the eastern Pontides allow a proper reconstruction of their origin for the first time. The intrusive rocks comprise four distinct bodies, two of which we investigated in detail. Based on LA-ICP-MS U-Pb zircon dating, the Derinoba and Kayadibi granites have similar 206Pb/ 238U versus 207Pb/ 235U Concordia ages of 311.1 2.0 and 317.2 3.5 million years for the former and 303.8 1.5 million years for the latter. Aluminium saturation index values of both granites are between 0.95 and 1.35, indicating dominant peraluminous melt compositions. Both intrusions have high SiO 2 (74-77 wt.%) contents and show high-K calc-alkaline and I-to S-type characteristics. Primitive mantle-normalized element diagrams display enrichment in K, Rb, Th, and U, and depletion in Ba, Nb, Ta, Sr, P, and Ti. Chondrite-normalized rare earth element patterns are characterized by concave-upward shapes and pronounced negative Eu anomalies with L acn/Y bcn=4.6-9.7 and E ucn/Eu*=0.11-0.59 (Derinoba), and L acn/Y bcn=2.7-5.5 and E ucn/Eu*=0.31-0.37 (Kayadibi). These features imply crystal-melt fractionation of plagioclase and K-feldspar without significant involvement of garnet. The Derinoba samples have initial Nd values between-6.1 and-7.1 with Nd model ages and T DM between 1.56 and 2.15 thousand million years. The Kayadibi samples show higher initial Nd (I) values,-4.5 to-6.2, with Nd model ages between 1.50 and 1.72 thousand million years. This study demonstrates that the Sr isotope ratios generally display negative correlation with Nd isotopes; Sr isotope ratios were lowered in some samples by hydrothermal interaction or alteration. Isotopic and petrological data suggest that both granites were produced by the partial melting of early Palaeozoic lower crustal rocks, with minor contribution from the mantle. Collectively, these rocks represent a late stage of Hercynian magmatism in the eastern Pontides.
- MakaleYalnız künye2012Virtual or physical: In-service and pre-service teacher's beliefs and preferences on manipulatives
Akkan, Yasar
Although the use of physical manipulatives, which have been emphasized to use in preschool education program and primary and secondary mathematics curriculum, in classroom environments is old, it is very new to use virtual manipulatives in classroom environments. The selection, preparation, and the integration to learning environments of both types of manipulatives are the most basic duties of teachers. However, the experiences, of using the physical and virtual manipulatives in course environments, of teachers and pre-service teachers are influenced by beliefs about the nature, teaching and learning of mathematics. The aim of this study is to determine and compare the beliefs of teachers and pre-service teachers in different branches for the use of virtual and physical manipulatives in mathematics education. For this purpose, 148 teachers, in the provinces of Trabzon, Kars and Gümüşhane, and 228 pre-service teachers, in the Education Faculties of Karadeniz Technical University and Kafkas University, have been applied two types of scales and interviews have been conducted with 40 teachers and pre-service teachers selected from that sample. Frequencies, percentages and arithmetic averages have been used to analyze the data. As a result, the majority of teachers and pre-service teachers have been identified to carry positive beliefs for the use of virtual and physical manipulatives in mathematics education and they have expressed that they desire to use both types of manipulatives more in the future.
- MakaleYalnız künye2012Remote sensing and GIS-based landslide susceptibility mapping using frequency ratio and analytical hierarchy methods in Rize province (NE Turkey)
Reis, S.; Yalcin, A.; Atasoy, M.; Nisanci, R.; Bayrak, T.; Erduran, M.; Sancar, C.; Ekercin, S.
The northeast part of Turkey is prone to landslides because of the climatic conditions, as well as geologic and geomorphologic characteristics of the region. Especially, frequent landslides in the Rize province often result in significant damage to people and property. Therefore, in order to mitigate the damage from landslides and help the planners in selecting suitable locations for implementing development projects, especially in large areas, it is necessary to scientifically assess susceptible areas. In this study, the frequency ratio method and the analytical hierarchy process (AHP) were used to produce susceptibility maps. Especially, AHP gives best results because of allowing better structuring of various components, including both objective and subjective aspects and comparing them by a logical and thorough method, which involves a matrix-based pairwise comparison of the contribution of different factors for landslide. For this purpose, lithology, slope angle, slope aspect, land cover, distance to stream, drainage density, and distance to road were considered as landslide causal factors for the study area. The processing of multi-geodata sets was carried out in a raster GIS environment. Lithology was derived from the geological database and additional field studies; slope angle, slope aspect, distance to stream, distance to road and drainage density were invented from digital elevation models; land cover was produced from remote sensing imagery. In the end of study, the results of the analysis were verified using actual landslide location data. The validation results showed satisfactory agreement between the susceptibility map and the existing data on landslide locations.
- MakaleAçık Erişim2012Exergetic evaluation of speed and load effects in spark ignition engines; [Évaluation exergétique des effets de la vitesse et de la charge dans les moteurs à allumage par étincelle]
Sezer, I.; Bilgin, A.
This study investigates the effects of various operating conditions in spark ignition engines via an exergy analysis. A thermodynamic cycle model including compression, combustion and expansion processes was used for investigation. Induction and exhaust processes were computed with a simple approximation method. The principles of the second law were applied to the cycle model to perform the exergy analysis. Exergetic variables, i.e., the exergy transfers with heat and work, irreversibilities, thermomechanical exergy, fuel chemical exergy and total exergy were calculated in the exergy analysis. Variation of the exergetic parameters and the distribution of them into the fuel exergy were determined for various operating conditions, i.e., engine speed and load. The first and second law efficiencies and specific fuel consumption were also computed to reveal the optimum operating conditions. The results show that the exergy transfer with heat decreases and the exergy transfer with exhaust gases increases with increasing engine speed. Engine speed of 3 000 rpm gives the maximum exergy transfer as work, the minimum irreversibility and the best efficiency and fuel consumption. Exergy transfers with heat, work and exhaust and irreversibilities increase with increasing engine load. Additionally, the first and second law efficiencies increase and fuel consumption decreases with increasing engine load, so a high engine load gives the best efficiency and fuel consumption.
- MakaleYalnız künye2012Statistical correlation between b-value and fractal dimension regarding Turkish epicentre distribution
Öztürk, Serkan
This study was aimed at analysing the relationship between seismic b-value and fractal dimension Dc-value for Turkish epicentres. The earthquake catalogue consisting of 99,737 instrumentally-registered Turkish events was analysed for the period between 1970 and 2011; Turkey was divided into 55 tectonic zones for making a detailed comparison. The b-values were calculated by the maximum likelihood method and the Dc-values were obtained with 95% confidence limits by linear regression. The results showed that higher Dc-values were associated with lower b-values and this could have been an indication of relatively high stress intensity and stronger epicentre clustering in these regions. Orthogonal regression was used to estimate a suitable statistical correlation between two seismotectonic parameters; the Dc = 2.44 - 0.30*b relationship was obtained with a strong negative correlation (r = -0.82) between b-value and Dc-value for Turkish earthquake distribution. This seemed to agree with other regional results obtained for different parts of Turkey and the rest of the world.
- MakaleAçık Erişim2012New considerations for empirical estimation of tensile strength of rocks
Gurocak, Zulfu; Solanki, Pranshoo; Alemdag, Selcuk; Zaman, Musharraf M.
In this paper, a combined laboratory and modeling study was conducted to develop a database for predicting tensile strength of rocks. Six hundred eighty six rock samples from 24 different sites throughout eastern Turkey were collected and tested for the development of this database and evaluation of models. A total of 512 samples were used for developing the models and the remaining 174 samples were used as control dataset. The material parameters selected in the development of the models include tensile strength (σ t), point load index (Is (50)), Schmidt rebound number (N) and unit weight (γ). A total of four models, two regression models, namely, simple linear regression and multiple regression, and two feed forward-type artificial neural network (ANN) models, namely, radial basis function network (RBFN) and multi-layer perceptron network (MLPN) are developed. A commercial software, Statistica 8.0, is used to develop these models. The strengths and weaknesses of the developed models were assessed by comparing the predicted σ t values with the experimental values with respect to the R 2 values. Overall, the MLPN model was found to be the best model for the present development and evaluation datasets. As a result of these analyses, an equation was suggested based on ANN model to estimate the tensile strength of rocks.
- MakaleYalnız künye2012One-dimensional thermal modeling of the eastern pontides orogenic belt (NE Turkey)
Maden, Nafiz
The eastern Pontides orogenic belt is one of the most complex geodynamic settings in the Alpine-Himalayan belt due to the lack of systematical geological and geophysical data. In this study, 1D crustal structure and P-wave velocity distribution obtained from gravity modeling and seismological data in the area has been used for the development of the thermal model of the eastern Pontides orogenic belt. The computed temperature-depth profiles suggest a temperature of 590 ± 60°C at a Moho depth of 35 km indicates the presence of a brittle-ductile transition zone. This temperature value might be related to water in the subducted crust of the Tethys oceanic lithosphere. The Curie temperature depth value of 29 km, which may correspond to the crustal magma chambers, is found 5-7 km below the Moho depth. Surface heat flow density values vary from 66.5 and 104.7 mW m -2. High mantle heat flow density value of 48 mW m -2 is obtained for the area should be related to melting of the lithospheric mantle caused by upwelling of asthenosphere.
- BildiriYalnız künye2012Acetohydrazide derivative for selective separation and preconcentration of Cu(II) ions by coprecipitation method without using a carrier element
Ozdes, Duygu; Duran, Celal; Bektaş, Hakan; Tufekci, Mehmet; Soylak, Mustafa
A simple and rapid procedure based on the combination of carrier element free coprecipitation (CEFC) and flame atomic absorption spectrometric (FAAS) determinations has been developed for selective separation and preconcentration of Cu(II) ions in some environmental solid (Turkish and import coffee) and liquid (sea and stream waters) samples. In this method, acetohydrazide derivative was used as an organic coprecipitant without adding any carrier element for coprecipitation of Cu(II) ions. The preconcentration factor was found to be 50, the limit of detection (LOD) was 0.31 μgL -1, while the relative standard deviation (RSD) was found to be 1.6% for Cu(II) ions.
- MakaleAçık Erişim2012Probabilistic sensitivity analysis of two suspension bridges in Istanbul, Turkey to near- and far-fault ground motion
Çavdar, Ö.
The aim of this paper is to compare the near-fault and far-fault ground motion effects on the probabilistic sensitivity dynamic responses of two suspension bridges in Istanbul. Two different types of suspension bridges are selected to investigate the near-fault (NF) and far-fault (FF) ground motion effects on the bridge sensitivity responses. NF and FF strong ground motion records, which have approximately identical peak ground accelerations, of the Kocaeli (1999) earthquake are selected for the analyses. Displacements and internal forces are determined using the probabilistic sensitivity method (PSM), which is one type of stochastic finite element method. The efficiency and accuracy of the proposed algorithm are validated by comparison with results of the Monte Carlo Simulation (MCS) method. The displacements and internal forces obtained from the analyses of suspension bridges subjected to each fault effect are compared with each other. It is clearly seen that there is more seismic demand on displacements and internal forces when suspension bridges are subjected to NF and FF ground motion.
- MakaleAçık Erişim2012Optimization of a new cloud point extraction procedure for the selective determination of trace amounts of total iron in some environmental samples
Duran, Celal; Özdeş, Duygu; Çelenk Kaya, Elif; Kantekin, Halit; Bulut, Volkan Numan; Tüfekçi, Mehmet
A new, simple, and rapid cloud point extraction (CPE) procedure system, combined with flame atomic absorption spectrometry (FAAS), was developed for selective separation, preconcentration, and determination of trace amounts of total iron in some environmental samples. The complexing agent, N,N-(2,2 - (ethane-1,2-diylbis(oxy))bis(ethane-2,1-diyl))bis(2-chloroacetamide) (EDBOCA), is selective at pH 5.0 for only Fe(II) and Fe(III) ions in the presence of Cu(II), Pb(II), Cd(II), Mn(II), Co(II), Cr(III), Cr(VI), Ni(II), Zn(II), Al(III), Mo(VI), Pd(II), Pt(IV), Au(III), and V(V) ions. The procedure is based on the complexation of Fe(III) ions with EDBOCA reagent in the presence of Triton X-114 (TX-114) as a non-ionic surfactant. The optimum conditions for the CPE of Fe(III) ions were investigated with respect to several experimental parameters such as pH of the solution, TX-114 and EDBOCA concentrations, incubation time and temperature, and centrifugation rate and time. The detection limit for Fe(III) ions based on the 3 times the standard deviation of the blanks (N:10) was found to be 1.22 μg L ?1 , while the relative standard deviation (RSD) was 4.2%. Environment Canada TM-25.3 and CRM-SA-C Sandy Soil C, as certified reference materials, were used, and spike tests were applied to validate the method. The method was applied to some real environmental samples to evaluate their total iron levels.