Cationic Metals

Most cations are best measured with DGT passive samplers that incorporate Chelex resin in the binding layer, the standard DGT passive samplers for cations. The exceptions are: Al, Hg and methyl mercury, and U.

For advice on the specialist DGT device you need, please click on:

Al            Hg and methyl mercury         U

All other analytes you have selected can be measured using standard DGT 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

Note that for most waters it is only possible to measure Ca and Mg using very short deployment times (<24 hours) because their high concentrations soon saturate the resin (see Dahlqvist, 2002, Jiménez-Piedrahita, 2017).

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).