采用聚季铵盐作为扩散梯度薄膜技术中的结合剂，对水中六价铬进行选择性采样和测量。
Selective sampling and measurement of Cr (VI) in water with polyquaternary ammonium salt as a binding agent in diffusive gradients in thin-films technique.
机构信息
College of Chemistry, Chemical Engineering and Food Safety, Bohai University, China; Research Institute of Food Science, Bohai University, China; Food Safety Key Lab of Liaoning Province, Jinzhou 121013, China.
College of Chemistry, Chemical Engineering and Food Safety, Bohai University, China; Research Institute of Food Science, Bohai University, China; Food Safety Key Lab of Liaoning Province, Jinzhou 121013, China.
出版信息
J Hazard Mater. 2014 Apr 30;271:160-5. doi: 10.1016/j.jhazmat.2014.02.022. Epub 2014 Feb 25.
A diffusive gradients in thin films (DGT) device with polyquaternary ammonium salt (PQAS) as a novel binding agent (PQAS DGT) combined with graphite furnace atomic absorption spectrometry (GFAAS) was developed for the selective sampling and measurement of Cr (VI) in water. The performance of PQAS DGT was independent of pH 3-12 and ionic strength from 1 × 10(-3) to 1 molL(-1). DGT validation experiments showed that Cr (VI) was measured accurately as well as selectively by PQAS DGT, whereas Cr (III) was not determined quantitatively. Compared with diphenylcarbazide spectrophotometric method (DPC), the measurement of Cr (VI) with PQAS DGT was agreement with that of DPC method in the industrial wastewater. PQAS-DGT device had been successfully deployed in local freshwater. The concentrations of Cr (VI) determined by PQAS DGT coupled with GFAAS in Nuer River, Ling River and North Lake were 0.73 ± 0.09 μg L(-1), 0.50 ± 0.07 μg L(-1) and 0.61 ± 0.07 μg L(-1), respectively. The results indicate that PQAS DGT device can be used for the selective sampling and measurement Cr (VI) in water and its detection limit is lower than that of DPC method.
一种以聚季铵盐（PQAS）为新型结合剂的扩散梯度薄膜（DGT）装置（PQAS DGT）与石墨炉原子吸收光谱法（GFAAS）相结合，用于选择性采样和测量水中的六价铬（Cr（VI））。PQAS DGT 的性能不受 pH 值 3-12 和离子强度 1×10(-3)至 1 molL(-1)的影响。DGT 验证实验表明，PQAS DGT 可以准确、选择性地测量 Cr（VI），而 Cr（III）则不能定量测定。与二苯碳酰二肼分光光度法（DPC）相比，在工业废水中，用 PQAS DGT 测量 Cr（VI）与 DPC 法一致。PQAS-DGT 装置已成功部署在当地淡水中。用 PQAS DGT 耦合 GFAAS 测定怒尔河、灵河和北湖中的 Cr（VI）浓度分别为 0.73±0.09 μg L(-1)、0.50±0.07 μg L(-1)和 0.61±0.07 μg L(-1)。结果表明，PQAS DGT 装置可用于选择性采样和测量水中的 Cr（VI），其检测限低于 DPC 法。
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