An evaluation of ferrihydrite- and Metsorb™-DGT techniques for measuring oxyanion species (As, Se, V, P): Effective capacity, competition and diffusion coefficients
An evaluation of ferrihydrite- and Metsorb™-DGT techniques for measuring oxyanion species (As, Se, V, P): Effective capacity, competition and diffusion coefficients
复制标题
DOI：
10.1016/j.aca.2013.07.001
复制
发表时间：
2013-11-25
影响因子：
6.2
通讯作者：
Jolley, Dianne F.
中科院分区：
文献类型：
--
作者：
Price, Helen L.;Teasdale, Peter R.;Jolley, Dianne F.
本研究调查了几个知识差距方面的扩散梯度薄膜（DGT）技术测量含氧阴离子（As（III），As（V），Se（IV），Se（VI），PO 43-，和V（V））使用的ferrihydrite和Metsorb（TM）的结合层。各结合层的洗脱效率在1：20稀释时更高，因为ICP-MS的分析干扰最小化。扩散池和DGT时间序列实验测得的扩散系数一致，并普遍同意与以前报道的值，虽然一个范围内的扩散系数已被报道为无机砷和硒物种。水铁矿和Metsorb（TM）的相对结合亲和力为PO 43-近似于As（V）> V（V）近似于As（III）> Se（IV）Se（VI），并且在单离子溶液中测量了有效结合能力，并掺入了合成淡水和海水，为DGT监测的实际决策提供了建议。在测试的条件下，水铁矿和MetsorbTM结合层的性能对于As（V）、As（III）、Se（IV）、V（V）和PO 43-在部署跨度上是直接可比的。
This study investigated several knowledge gaps with respect to the diffusive gradients in thin films (DGT) technique for measurement of oxyanions (As(III), As(V), Se(IV), Se(VI), PO43-, and V(V)) using the ferrihydrite and Metsorb (TM) binding layers. Elution efficiencies for each binding layer were higher with 1:20 dilutions, as analytical interferences for ICP-MS were minimised. Diffusion coefficients measured by diffusion cell and by DGT time-series experiments were found to agree well and generally agreed with previously reported values, although a range of diffusion coefficients have been reported for inorganic As and Se species. The relative binding affinity for both ferrihydrite and Metsorb (TM) was PO43-approximate to As(V) > V(V)approximate to As(III) > Se(IV) Se(VI) and effective binding capacities were measured in single ion solutions, and spiked synthetic freshwater and seawater, advising practical decisions about DGT monitoring. Under the conditions tested the performance of both ferrihydrite and MetsorbTM binding layers was directly comparable for As(V), As(III) Se(IV), V(V) and PO43- over a deployment spanning