Selective speciation and determination of inorganic arsenic in water, food and biological samples.
Selective speciation and determination of inorganic arsenic in water, food and biological samples.
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DOI：
10.1016/j.fct.2009.09.012
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Tuzen;K. O. Saygi;I. Karaman;M. Soylak
中科院分区：
文献类型：
--
作者：
M. Tuzen;K. O. Saygi;I. Karaman;M. Soylak
本文建立了天然水样中砷（Ⅲ）和砷（Ⅴ）的形态分析方法。在pH为7的条件下，砷（III）在Diaion HP-2 MG树脂上可定量回收，而砷（V）的回收率低于10%。用KI和L（+）抗坏血酸溶液还原含As（III）和As（V）混合溶液中的砷（V），然后测定总砷。砷（V）计算为总砷含量与As（III）含量之间的差值。采用氢化物发生原子吸收光谱法测定砷。研究了碱金属、碱土金属和过渡金属对生物吸附砷的影响。预富集系数为35。As（III）（N=20，k=3）的检测限为11ngL−1。测定的相对标准偏差和相对误差分别小于7%和4%。该方法的准确度用经认证的参考物质进行了确认。该方法已成功应用于水、食品和生物样品中无机砷的测定和形态分析。
A procedure for the speciation of arsenic(III) and arsenic(V) in natural water samples has been established in the presented work. Arsenic(III) ions were quantitatively recovered on Alternaria solani coated Diaion HP-2MG resin at pH 7, while the recoveries of arsenic(V) was below 10%. Arsenic(V) in the mixing solution containing As(III) and As(V) was reduced by using KI and L(+) ascorbic acid solution, then the procedure was applied to determination of total arsenic. Arsenic(V) was calculated as the difference between the total arsenic content and As(III) content. The determination of arsenic was performed by using hydride generation atomic absorption spectrometry. The influences of some alkali, earth alkali and transition metals on the biosorption of arsenic(III) were investigated. The preconcentration factor was 35. The detection limits for As(III) (N=20, k=3) was found as 11ngL−1. The relative standard deviation and relative error of the determinations were found to be lower than 7% and 4%, respectively. The accuracy of the method was confirmed with certified reference materials. The method was successively applied for the determination and speciation of inorganic arsenic in water, food and biological samples.