Novel speciation method based on diffusive gradients in thin-films for in situ measurement of Cr<sup>VI</sup> in aquatic systems
- Pan, Yue
- Guan, Dong-Xing
- Zhao, Di
- Luo, Jun
- Davison, William
- Ma, Lena Q.
DOIAbstract
Hexavalent chromium (CrVI) is much more toxic and mobile than the trivalent species (CrIII) and consequently, in situ monitoring of CrVI can improve the understanding of Cr biogeochemistry and toxicity in ecosystems. The passive diffusive gradients in thin-films (DGT) technique is a powerful tool for determining metal(loid) speciation, but a binding phase that absorbs only one specific species of Cr is needed. N-Methyl-d-glucamine (NMDG) functional resin was incorporated into the DGT binding phase for selective measurement of CrVI. This NMDG-DGT sampler exhibited a theoretically linear accumulation of CrVI, with negligible accumulation (<5%) of CrIII, even after 72 h deployment. The good prediction of CrVI concentration in synthetic freshwa...
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