Sulfate concentration

Sulfate is analyzed by ion chromatography in pore water samples fixed with ZnCl₂ 2% or ZnAc 2% (see method for measurement of sulfide concentration). The Zn₂⁺ fixes the dissolved sulfide to ZnS and prevents its oxidation to sulfate.





Laboratory

Depending on sulfate concentrations

pore water samples (or the centrifuged supernatants of the fixed samples) are diluted 20-100 fold (in 5-10 ml of dist. H2O). Dilution is essential because the Cl- and Ac--ions interfere with the detection of sulfate and peaks might overlap when samples are diluted less than 20 x.

Alternatively


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