Speciation analysis of inorganic selenium in wastewater using a highly selective cellulose-based adsorbent via liquid electrode plasma optical emission spectrometry,
Speciation analysis of inorganic selenium in wastewater using a highly selective cellulose-based adsorbent via liquid electrode plasma optical emission spectrometry,
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使用高选择性纤维素基吸附剂通过液体电极等离子体发射光谱法对废水中的无机硒进行形态分析，
DOI：
10.1016/j.jhazmat.2021.127250
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
H. Hasegawa
中科院分区：
文献类型：
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作者：
K.Nakakubo;T. Nishimura;F.B. Biswas;M. Endo;K. H. Wong;A. S. Mashio;T. Taniguchi;T. Nishimura;K. Maeda;H. Hasegawa
硒 (Se) 的形态通常是在使用吸附剂预浓缩后使用复杂的技术（例如 ICP-MS）进行的；然而，在含有高浓度SO42-的溶液中，尚未实现无机Se的分离和富集。本研究使用二硫代氨基甲酸酯改性纤维素 (DMC) 对废水中的无机硒进行选择性萃取和预浓缩，并采用便携式液体电极等离子体发射光谱法 (LEP-OES) 进行定量。研究发现 DMC 在较宽的 pH 范围（1.0–8.0）内可以选择性、定量地吸附亚硒酸盐 (SeIV)；然而，在 pH 值 3.0-11 范围内，只有不到 3.0% 的硒酸盐 (SeVI) 被吸附。即使在 3.5 mol L–1SO42– 存在的情况下，也能实现 SeIV 的定量萃取。 10 mg DMC 可以定量提取 SeIV 的最大样品体积为 500 mL。 KOH (0.60 mL, 1.5 mol L–1) 可以定量解吸吸附剂上保留的 SeIV，富集系数为 833。在浓度为 5.0 µmol L–1 的 SeIV 和 SeVI 合成烟气脱硫废水中，Se 的回收率为 96.2 ± 1.8% 和 105.8 ± 1.8%，分别。
Speciation of selenium (Se) is typically carried out using a sophisticated technique such as ICP-MS after preconcentration using an adsorbent; however, the separation and preconcentration of inorganic Se has not been realized in the solutions containing high concentrations of SO42–. A dithiocarbamate-modified cellulose (DMC) was used in this study for the selective extraction and preconcentration of inorganic Se in wastewater, with a portable liquid electrode plasma-optical emission spectrometry (LEP-OES) being employed for quantification. DMC was found to selectively and quantitatively adsorb selenite (SeIV) over a wide range of pH (1.0–8.0); however, less than 3.0% of selenate (SeVI) was adsorbed in a pH range of 3.0–11. Quantitative extraction of SeIVwas achieved even in the presence of 3.5 mol L–1SO42–. The maximum sample volume from which 10 mg of DMC could quantitatively extract SeIVwas found to be 500 mL. KOH (0.60 mL, 1.5 mol L–1) was found to quantitatively desorb SeIVretained on the adsorbent and yielded an enrichment factor of 833. The recovery of Se species from synthetic flue-gas desulfurization wastewater containing SeIVand SeVIat concentrations of 5.0 µmol L–1was 96.2 ± 1.8% and 105.8 ± 1.8%, respectively.