Chromium

While Cr(III) can be measured using the standard DGT passive sampler for cations with a Chelex binding layer, the oxyanion Cr(VI) cannot. A specialist binding layer of N-methyl-D- glucamine (DMDG) is required to measure Cr(VI). It can be used to selectively measure Cr(VI) in the presence of Cr(III).

For deployments in all types of waters you will need device LSNE-NP

For deployment in soils^A you will need device LSLE-NP

For deployments in sediments^B you will need LSPE-NP

For measurement of Cr(III) you will need the standard devices for cations.

For deployments in all types of waters you will need device LSNM-NP

For deployment in soils^A you will need device LSLM-NP

For deployments in sediments^B you will need LSPM-NP

Detailed instructions for the use of most DGT passive samplers are available.

^AThese soil devices are designed for deployment in homogenised hydrated soil samples.

^BThe sediment probes can be inserted directly into sediment and have a large enough area (exposure window 150 x 18 mm) to be capable of providing spatial information, e.g. vertical profiles or 2-D images. They have also been used to obtain similar information in hydrated soils (e.g. Luo et al., 2013).