Selective separation of tri- and pentavalent arsenic in aqueous matrix with a macrocycle-immobilized solid phase extraction system
Selective separation of tri- and pentavalent arsenic in aqueous matrix with a macrocycle-immobilized solid phase extraction system
复制标题
利用大环固定化固相萃取系统选择性分离水基体中的三价和五价砷
DOI：
10.1007/s11270-013-1526-0
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H. Hasegawa
中科院分区：
文献类型：
--
作者：
I. M. M. Rahman;Z. A. Begum;Y. Furusho;S. Mizutani;T. Maki;H. Hasegawa
建立了一种简单的基于流动的方法，用于使用大环固定化固相萃取（SPE）系统（通常称为分子识别技术（MRT）凝胶）选择性分离砷物种（+3和+5）。随后用石墨炉原子吸收光谱法对溶液或洗脱液中的砷物种进行定量。研究了砷（Ⅲ）和砷（Ⅴ）在MRT-SPE上的分离行为。结果表明，在pH 4 ~ 9范围内，As（V）可被固相萃取系统选择性地捕集，而As（III）则通过MRT-SPE。发现MRT-SPE材料对As（V）的保留容量为0.25 ± 0.04 mmol g−1。方法的检出限为0.06 μg L−1，相对标准偏差为2.9%（n= 10，C= 1 μmol L−1）。研究了基质离子的干扰。为了验证方法的有效性，对工业废水和地下水样品进行了标准物质分析，测定值与标准值吻合较好。方法用于天然水中三价和五价砷的形态分析，回收率≥ 98.7%。
A simple flow-based method was developed for the selective separation of arsenic species (+3 and +5) using a macrocycle-immobilized solid phase extraction (SPE) system, commonly known as molecular recognition technology (MRT) gel. Arsenic species in solution or in the eluent were subsequently quantified with graphite furnace atomic absorption spectrometry. The separation behaviors of As(III) and As(V) on MRT–SPE were investigated. It was found that As(V) can be selectively collected on the SPE system within the range of pH 4 to 9, while As(III) was passed through the MRT–SPE. The retention capacity of the MRT–SPE material for As(V) was found to be 0.25 ± 0.04 mmol g−1. The detection limit of the method for As(V) was 0.06 μg L−1, and the relative standard deviation was 2.9 % (n= 10,C= 1 μmol L−1). Interference from the matrix ions was studied. In order to validate the developed method, certified reference materials of effluent wastewater and groundwater samples were analyzed, and the determined values were in good agreement with the certified values. The proposed method was successfully applied to the speciation analysis of tri- and pentavalent arsenic in natural water samples showing satisfactory recoveries (≥ 98.7 %).