Flame atomic-absorption spectrometry (FAAS) is one of the most popular techniques for the determination of trace metals in industrial fertilizers or some environmental samples, due to being useful, inexpensive and selective.However, for extremely low analyte concentrations and matrix effects (such as PO4 3-, Cl -and SO4 2-ions) a preliminary preconcentration or separation technique is required.The solid phase extraction method (SPE) is generally used for the preconcentration of metal ions in various matrices. [1][2][3][4][5][6] In this technique, the dithiocarbamate extraction method is a useful means of enrichment, and dithiocarbamates do not react with many metals that are fairly abundant in environmental samples. To the preconcentration of trace metals, it has been applied prior to their determination by UV-VIS spectrophotometry, [7][8][9][10][11][12][13][14][15] AAS, [16][17][18][19][20][21]23 and electroanalytical method. 24,25 In these studies, sodium diethyldithiocarbamate (NaDDTC), ammonium pyrolidinedithiocarbamate (APDC) or ammonium hexamethylenedithiocarbamate (HMDC) reagent was added to an aqueous phase containing several metals. Then, metaldithiocarbamate complexes were formed and all of them were extracted on a solid phase, such as activated carbon, polyurethane foam, silica gel or amberlite XAD resins. In these applications, there were some difficulties, such as dithiocarbamate anions that decomposed in aqueous acidic medium. The selective extraction of the metal ions could not be achieved.On the other hand, several dithiocarbamate reagents have been used prior to an atomic-absorption spectrometric determination for the preconcentration of trace metals, as a coprecipitant with a carrier element, such as Ni(II) 26 and Bi(III). 27 In this method, the selective extraction of the metal ions is not possible because some ions in solution simultaneously precipitate when the precipitation occurs with a carrier element.In our preceding work, freshly precipitated metal diethyldithiocarbamates (Mn(DDTC)2, Zn(DDTC)2, Cd(DDTC)2, Fe(DDTC)3, Co(DDTC)2, Cu(DDTC)2, Ni(DDTC)2, Pb(DDTC)2 and Hg(DDTC)2) were tested as reagents for the selective extraction of Mn(II), Zn(II), Cd(II), Fe(III), Co(II), Cu(II), Ni(II), Pb(II) and Hg(II) ions from aqueous solution. It was found that these reagents show excellent selectivity for the extraction of metal ions. 28 In this present study, a new application of these reagents was carried out, where freshly precipitated Mn(DDTC)2 was used for the preconcentration of Cd and Zn in an aqueous system prior to their determination by FAAS. The aim of this work was to investigate the optimum conditions for the selective extraction and atomic-absorption spectrophotometric determination of Cd and Zn in some fertilizer samples. Experimental Apparatus and reagentsAn ATI-UNICAM 929 Model flame atomic-absorption spectrophotometer was used for the determination of metal ions. pH measurements were performed with a JENWAY 3040 Model digital pH-meter. C, H, N and S analyses were carried out by CHNS...
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