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Öğe First usage of ostracod species (Herpetocypris brevicaudata) carapace as a biosorbent with XAD-4 resin to determine Co(II), Cu(II) and Mn(II) trace metal ions(ELSEVIER, 2021) Topuz, Berrin; Batmaz, Filiz; Külköylüoğlu, Okan; Çapraz, ÇağatayPowdered ostracod carapace of the species (Herpetocypris brevicaudata), an invertebrate aquatic crustacean, loaded on Amberlite XAD-4 resin, were tested as a biosorbent to determine concentrations of trace metal ions (Cu (II), Co(II), Mn(II)) in water samples prior to UV-VIS spectrophotometric analyses. Effects of sample pH, volume, type and volume of eluent, matrix interference, and flow rate of sample and eluent were examined to investigate optimum biosorption conditions of the trace metal ions. Optimum pH values for Cu(II), Co(II) and Mn(II) were around 10.0. Metals were desorbed with 1 M HCl (recovery, 90-100% and high precision; SD < 5%). Sorption capacity of AXAD-4 resin loaded with H. brevicaudata was 0.71, 0.23 and 0.64 mmol g(-1) for Cu(II), Co(II) and Mn (II), respectively. Performances of the new sorbent were evaluated using certified reference material (TMDA-70.2 Ontario Lake Water).Öğe İlaç ve çevre numunelerinde eser miktardaki CU(II) iyonunun seçici UV-VIS spektrofotometrik tayini(2019) Topuz, BerrinMikrokristal naftalin (MN) üzerinde pH 3.0-8.0 aralığında potasyum 2,6-dimetilmorfolinditiyokarbamat (KMDMMDTC) ligantı kullanılarak büyük hacimli sulu çözeltilerden Cu(II) iyonu önderiştirilmiştir. Cu(II)- DMMDTC kompleksi içeren MN, 5 mL asetonda çözülerek Cu(II) iyonu kör çözeltiye karşı 431 nm’de spektrofotometrik metot ile tayin edildi. pH, numune çözeltisinin hacmi, DMMDTC yüklü MN miktarı, çalkalama süresi, yabancı iyon etkisi gibi katı faz ekstraksiyon (SPE) metodunun temel parametreleri incelendi. Aseton çözeltisinde 0,09 µgmL-1 tayin sınırı ile lineer kalibrasyon aralığı 0,05-5,0 µgmL-1’dir. Sudaki potansiyel yabancı iyonların etkisi araştırıldı ve önerilen metot ilaç ve çevresel numunelerden Cu(II) iyonunun tayini için uygulanarak % 90 üzerinde geri kazanım değerleri elde edildi. Doğruluk, sertifikalı referans madde NW-TMDA-70.2 analizi ve geri kazanım deneyleri ile değerlendirildi.Öğe Kobalt(II)’nin Amberlit XAD-4/SCHD reçinesi kullanılarak yeni bir katı-faz ekstraksiyon yöntemi ile zenginleştirilmesi ve spektrofotometrik tayini(2018) Topuz, Berrin; Pakdil, Nazlı Baldan; Solmaz, AyselBu çalışmada, çevresel su numunelerinden eser miktardaki Co(II)’nin, Amberlit XAD–4-N,N-bis(salisilidin)-siklohegzandiamin (SCHD) reçinesi kullanılarak katı faz ekstraksiyon yöntemiile ön deriştirilmesi, ayrılması ve UV-VIS spektrofotometrik yöntemle tayini için yeni bir metot önerilmiştir. Bu amaçla, Co(II) için XAD–4-SCHD reçinesi ile sorpsiyon ve elüsyon parametreleri (pH, elüent tipi ve konsantrasyonu, elüent hacmi, maksimum numune hacmi, numune akış hızı, elüent akış hızı) incelenmiştir. Box Behnken Dizayn Programı kullanılarak katı faz ekstraksiyonu ile Co(II)’nin geri kazanımı için sorpsiyon ve elüsyon bağımsız değişkenleri optimize edilmiştir. Önerilen yöntemin kalibrasyon grafiğinin 0.06–3??gmL?1 aralığında doğrusal olduğu tespit edilmiştir (r2?=?0.9980). Önderiştirme faktörü ve gözlenebilme sınırı sırasıyla 100 ve 8.4 µgL-1’dir. Yöntemin doğruluğu, sertifikalı standart su numunesinin (NW-TMDA-70.2) analizi ile kontrol edilerek % 90’ın üzerinde geri kazanım değerleri elde edilmiştir. Ayrıca, bu çalışmada önerilen metot kullanılarak eser miktarda Co(II) içeren farklı çevresel su numunelerinden elde edilen ölçüm sonuçları, ICP-MS ölçüm sonuçları ile benzer bulunmuştur. Önerilen metot, çevresel su numunelerinde eser miktardaki Co(II)’nin tayini için başarıyla uygulanmıştır.Öğe A new method for simultaneous determination of trace amounts of Cu(II) and Ni(II) ions by preconcentration and spectrophotometric analysis(2017) Topuz, Berrin; Adanur, Şennur Merve; Yalçuk, ArdaImmediate preconcentration and spectrophotometric methods have been developed for the determination of trace amounts of cupric ion (Cu(II)) and nickel ion (Ni(II)) through a solid phase extraction with XAD-4-N,N’-bis- (salicylidene) cyclohexanediamine (XAD-4-SCHD) resin and a complex color reaction of the ions with 2,6-dimethylmorpholine dithiocarbamate (DMMDTC) in Triton X-100 media. A high preconcentration factor of 125 was achieved. The spectrophotometric method was based on the measurements of the absorption of colored chelates of ions complexing with DMMDTC, and the adsorptions of the complex solutions were measured at their maximum absorption peaks at 460 and 328 nm for Cu(II) and Ni(II) ions, respectively. The impact of the complexing reaction variables including type and amount of surfactant, pH, amount of ligand, and complexation time on the sensitivity of the proposed method was optimized. Calibration graphs were found to be linear in the ranges of 0.02–3 and 0.02–2.5 mg L−1 with detection limits of 5 and 7 µg L−1 for Cu(II) and Ni(II), respectively. The accuracy of the developed method was calculated by recovering all Cu(II) and Ni(II) ions in synthetic and TMDA-70.2 certified reference water samples. Results of the proposed method were also compared with inductively coupled plasma-mass spectrometry results for the determination of trace Cu(II) and Ni(II) ions in water samples.Öğe A novel method for the simultaneous determination of Pb (II), Cd (II) and Zn (II) in environmental water samples(Taylor & Francis Ltd, 2019) Topuz, Berrin; Kabadayı, Filiz; Solmaz, AyselA novel UV-VIS spectrophotometric method was developed in this study by using solid phase extraction procedure for the simultaneous preconcentration, separation and determination of trace levels of Pb (II), Cd (II) and Zn (II) ions in various water samples by using Amberlite N,N-bis(salicylidene)cyclohexanediamine (SCHD) resin. This study presents the results of experimental procedures carried out like the adsorption of analytes to the resin, influences of some analytical parameters that effect the recovery such as pH, sample volume, sample flow rate, eluent type and concentration, eluent volume, eluent flow rate and the effects of alkaline metals, earth alkaline metals and some other transition metals. The analytes in the samples with the adjusted pH range of 4-7 were adsorbed on XAD-4-SCHD resin and eluted by using 1.0 mol L-1 nitric acid. The amounts of ions were determined by using UV-VIS spectrometer. The limits of detection were 0.03, 0.07 and 0.05 mu g mL(-1) for Pb (II), Cd (II) and Zn (II), respectively. The accuracy of the method was assured by the analysis of the certified standard water sample NW-TMDA-70.2 and the observed recoveries were above 93%. Different environmental water samples that contain trace amounts of Pb (II), Cd (II) and Zn (II) were analysed by using the method developed in this study. Same samples were also analysed by ICP-MS for comparison and almost the similar results were observed. The method developed in this study was successfully applied to the various environmental water samples to determine the trace levels of Pb (II), Cd (II) and Zn (II) ions.Öğe Preconcentration and separation of Mn(II) from environmental water samples on N,N-bis (salicylidene) cyclohexanediamine functionalized amberlite XAD-4 resin and Its spectrophotometric assessment(Pleiades Publishing Inc, 2020) Topuz, Berrin; Yakut, Şennur MerveA new and sensitive preconcentration procedure was developed for the determination of trace amount of Mn(II) in environmental water samples. Amberlite XAD-4 resin was functionalized with N,N-bis(salicylidene)cyclohexanediamine (SCHD) to preconcentrate and separate Mn(II) at the trace level concentrations. Mn(II) ion in environmental water samples was determined by the formaldoxime spectrophotometric method. The influences of analytical parameters including pH and volume of sample, type and concentration of elution solution, flow rate of sample and elution solution, etc. were investigated on the recoveries of Mn(II) ion. The adsorption was achieved quantitatively for Mn(II) on XAD-4-SCHD resin at the pH range of 3-10 and 3 mL min(-1) sample flow rate. Elution was performed with 0.5 mol L-1 nitric acid solution. Under the optimized conditions, calibration curve was found to be linear in the concentration range of 0.1-5 mg L-1 with a limit of detection of 0.65 mu g L-1. The effect of foreign ions on the perconcentration and determination of Mn(II) was studied and no adversely affecting ion was observed even at high ionic media. The recovery value was above 90%, with an enrichment factor of 100. The per cent relative standard deviation (%) value was found to be 1.8 for twenty repetitive measurements containing 1 mg L-1 of Mn(II). Sorption capacity of the Mn(II) ion on the XAD-4-SCHD resin was found to be 29.217 mu g. The accuracy of the presented preconcentration and determination method was checked by the analysis of TMDA-70.2 Ontario lake Water certified reference material and synthetic water sample. The method was applied for the analyses of tap water and industrial wastewater samples for Mn(II). Almost the similar results were observed for the Mn(II) determination in different environmental water samples using both the proposed and ICP-MS methods.Öğe Selective solid phase extraction and preconcentration of ultra-trace inorganic mercury in water samples using 2,6-dimethyl-morpholine dithiocarbamate(Taylor & Francis Ltd, 2019) Topuz, BerrinA sensitive and selective solid-phase spectrophotometric method for the determination of trace amounts of Hg(II) cation in water is described. A complex was created with Hg(II) using 2,6-dimethyl-morpholine dithiocarbamate (DMMDTC) to form Hg(II)-(DMMDTC) and this complex was adsorbed onto microcrystalline naphthalene (MN) and then eluted with 5% acetic acid (in ethanol) solution. A preconcentration factor of 187 and a recovery of 95% were observed at pH of 5.0 and for 10 min. of extraction. The separated Hg(II) ions were quantified by using ultraviolet-visible spectrophotometer at 490.0 nm by creating a colored complex with dithizone in Triton X-100 surfactant media. Molar absorptivity and sandell's sensitivity for the Hg(II)-dithizone were determined as 4.96 x 10(5) Lmol(-1)cm(-1) and 0.4032 mu g cm(-2), respectively. The detection limit (LOD) was 1.7 mu g L-1 under the optimized conditions of the analytical method.Öğe Simultaneous preconcentration and determination of Cu(II), Ni(II), and Co(II) in food and environmental samples by the application of chelate adsorption on amberlite XAD-1180(Springer, 2023) Topuz, Berrin; Altınışık, Ece TalyaA simultaneous preconcentration and determination procedure for solid phase extraction on AXAD-1180 as 2,6-dimethylmorpholinedithiocarbamate (DMMDTC) chelates and spectrophotometric determinations of Cu (II), Ni (II), and Co (II) in food and environmental samples is proposed in the present work. The effect of some SPE parameters, such as reagent amount, sample pH, eluent type, concentration, and volume, sample and eluent flow rate, and sample volume, on trace metal ion recovery (R%) for the method developed in the standard model solution medium was investigated. Cu(II), Ni(II), and Co(II) retained as DMMDTC complexes on Amberlite XAD-1180 were eluted with 10 mL of 1 M HNO3 (in acetone). Foreign ions were also studied individually on the recovery of trace metal ions using the developed method. Cu(II), Ni(II), and Co(II) ions were preconcentrated and separated from the sample using the developed SPE method, and their concentrations were simultaneously determined using the UV-Vis spectrophotometric method. The spectrophotometric determination was made by measuring the absorbance of colored chelates of metal ions complexed with DMMDTC in a surfactant medium (1% Triton X-100) at wavelengths of 460, 328, and 342 nm for Cu(II), Ni(II), and Co(II), respectively. To test the method's accuracy, certified reference materials (CRM 1204 waste water and TMDA-70.2 Ontario lake water) were analyzed using the proposed method, and metal recoveries were calculated to be between 97.1 and 100.7%. The proposed method worked well with the wheat flour sample. Wheat flour has Cu(II) and Ni(II) contents of 2.16 mu gmL(-1) and 0.56 mu gmL(-1), respectively.Öğe Simultaneous spectrometric determination of Cu(II), Co(II), and Ni(II) in pharmaceutical and environmental samples with XAD-4/DMMDTC solid-phase extraction system(Humana Press Inc, 2020) Topuz, BerrinA method for the preconcentration of Cu(II), Co(II), and Ni(II) based on their complex formation with the potassium salt of 2.6-dimethyl-morpholinedithiocarbamate (DMMDTC) and the Amberlite XAD-4 resin as a solid support in a column was suggested. Cu(II), Co(II), and Ni(II) were detected by using the suggested spectrophotometric method in Triton X-100 media. The analytes were adsorbed as DMMDTC complexes on Amberlite XAD-4 column at the pH range of 4-6 and eluted with 0.5 M HNO3 in acetone. The best possible enrichment factors for trace metal ions were achieved by optimizing the experimental conditions including reagent amount, eluent type, sample and eluent flow rates, sample volume, and the effects of matrix ions. The detection limits of Cu(II), Co(II), and Ni(II) were found to be 11.2, 26.1, and 1.37 mu g L-1, respectively. The accuracy of the proposed method was confirmed by determining the analytes in two Certified Reference Materials (TMDA-70.2 Ontario Lake Water and BCR-715 Waste Water) with the recoveries of more than 90%. The proposed method was successfully applied to the environmental and pharmaceutical samples.
