Sulphide is quantitatively accumulated on a DGT binding layer of AgI. The light yellow of the silver iodide changes to black as the sulphide accumulates. The resulting grey scale image allows simple quantification of sulphide concentration in a two dimensional map using a normal scanner and laptop. S can also be destructively analysed, for example by laser ablation ICP-MS. Suitable DGT passive samplers are available for deployment in sediments and soils.
For deployment in soilsA you will need device LSLH-NP
For deployments in sedimentsB you will need LSPH-NP
The distribution of sulphide in sediments is often very relevant to the distribution of other analytes. Probes that incorporate binding layers for both sulphide and cationic and/or anionic substances can be fabricated on request.
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).
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