A nano-structured material for reliable speciation of chromium and manganese in drinking waters, surface waters and industrial wastewater effluents
A nano-structured material for reliable speciation of chromium and manganese in drinking waters, surface waters and industrial wastewater effluents
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DOI：
10.1016/j.talanta.2012.03.022
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发表时间：
2012-05-30
期刊：
影响因子：
6.1
通讯作者：
Sadeghi, G. H.
中科院分区：
文献类型：
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作者：
Abdolmohammad-Zadeh, H.;Sadeghi, G. H.
以镍铝层状双氢氧化物（Ni-Al LDH）为纳米吸附剂，建立了一种简单的固相萃取火焰原子吸收光谱法（FAAS）测定铬和锰的形态分析方法。该方法是基于这样一个事实，即Cr（VI）和Mn（VII）含氧阴离子可以吸附在Ni-Al（NO3-）LDH和/或交换LDH层间NO3-离子在pH 6.0，而Cr（III）和Mn（II）阳离子通过LDH填充柱没有保留。总Cr和Mn的测定，从而间接地Cr（III）和Mn（II）的测定，涉及分别用H2 O2和KIO 4的酸性溶液将Cr（III）和Mn（II）预氧化成Cr（VI）和Mn（VII）。对影响截留率的几个重要因素进行了考察和优化。在最佳实验条件下，Cr（VI）和Mn（VII）的检出限（3S（B）/m）分别为0.51和0.47 ng mL（-1），相对标准偏差分别为2.5和3.2%（C = 30.0 ng mL（-1），n = 6）。所提出的方法进行了验证，通过分析认证的参考物质，并适用于饮用水沃茨，地表水沃茨和工业废水中的铬和锰的形态。(C)2012爱思唯尔有限公司版权所有。
A simple solid phase extraction system based on the applying the nickel-aluminum layered double hydroxide (Ni-Al LDH) as a nano-sorbent was developed for the speciation analysis of chromium and manganese by flame atomic absorption spectrometry (FAAS). The method is based on the fact that Cr(VI) and Mn(VII) oxyanions could be adsorbed on the Ni-Al(NO3-) LDH and/or exchanged with LDH interlayer NO3- ions at pH 6.0, whereas Cr(III) and Mn(II) cations pass through the LDH-packed column without retention. The determinations of total Cr and Mn, and hence indirectly Cr(III) and Mn(II), involve the pre-oxidations of Cr(III) and Mn(II) to Cr(VI) and Mn(VII) with H2O2 and acidic solution of KIO4, respectively. Several important factors affecting the retention efficiency were investigated and optimized. In the optimum experimental conditions, the limits of detection (3S(b)/m) for Cr(VI) and Mn(VII) were 0.51 and 0.47 ng mL(-1), and the relative standard deviations were 2.5 and 3.2% (C = 30.0 ng mL(-1), n = 6), respectively. The presented method was validated by the analysis of a certified reference material, and applied to the speciation of Cr and Mn in drinking waters, surface waters and industrial wastewater effluents. (C) 2012 Elsevier B.V. All rights reserved.