Simultaneous Measurements of Eight Oxyanions Using High-Capacity Diffusive Gradients in Thin Films (Zr-Oxide DGT) with a High-Efficiency Elution Procedure
Simultaneous Measurements of Eight Oxyanions Using High-Capacity Diffusive Gradients in Thin Films (Zr-Oxide DGT) with a High-Efficiency Elution Procedure
复制标题
使用薄膜中的高容量扩散梯度（Zr-氧化物 DGT）通过高效洗脱程序同时测量八种氧阴离子
DOI：
10.1021/acs.est.6b00206
复制
发表时间：
2016
影响因子：
11.4
通讯作者：
Zhang Chaosheng
中科院分区：
文献类型：
--
作者：
Ding Shiming;Xu Di;Wang Yanping;Wang Yan;Li Yangyang;Gong Mengdan;Zhang Chaosheng
A zirconium oxide binding gel-based diffusive gradients in thin films (Zr-oxide DGT) was developed for simultaneous measurements of P(V), As(V), Cr(VI), Mo(VI), Sb(V), Se(VI), V(V), and W(VI). All of the oxyanions were rapidly bound to Zr-oxide gel with differences in binding affinity. The eight bound oxyanions were successfully recovered by one-step elution using a mild reagent of 0.2 M NaOH–0.5 M H2O2by overcoming the problems in analyses of the oxyanions. The optimized elution time was reduced to 3–5 h from 24–48 h required by other DGTs. DGT uptakes of all the oxyanions were independent of pH (4.42–8.45) and ionic strength (0.1–500 mM). The DGT capacities for six oxyanions detected in multioxyanion solution were only 0.19 to 0.35 times of those detected in single-oxyanion solution, reflecting a strong competition among the oxyanions during DGT uptake. Except for Se(VI) in seawater, Zr-oxide DGT accurately measured all of the oxyanions in synthetic freshwater and seawater, with the capacities ∼29 to >2397 times and ∼7.5 to 232 times those of two commonly used DGTs (Metsorb and precipitated ferrihydrite (PF) DGTs) in freshwater and seawater, respectively. Measurements by Zr-oxide DGT in contaminated sediments were in agreement with only two oxyanions with the two commonly used DGTs; the two DGTs accumulated less or no mass of other oxyanions. This study demonstrates significant advantage of Zr-oxide DGT over the other DGTs in simultaneous measurements of the eight oxyanions due to the former’s high capacity and a wide tolerance to environmental interferences, together with a high efficiency in elution.
