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A new, rapid and reliable method for the determination of reduced sulphur (S2−) species in natural water discharges

Author:
Giordano Montegrossi   Franco Tassi   Orlando Vaselli   Eva Bidini and Angelo Minissale  


Journal:
Applied Geochemistry


Issue Date:
2006


Abstract(summary):

The determination of reduced S species in natural waters is particularly difficult due to their high instability and chemical and physical interferences in the current analytical methods. In this paper a new, rapid and reliable analytical procedure is presented, named the Cd–IC method, for their determination as ΣS2− via oxidation to after chemical trapping with an ammonia–cadmium solution that allows precipitation of all the reduced S species as CdS. The S2−–SO4 is analysed by ion-chromatography. The main advantages of this method are: low cost, high stability of CdS precipitate, absence of interferences, low detection limit (0.01 mg/L as SO4 for 10 mL of water) and low analytical error (about 5%). The proposed method has been applied to more than 100 water samples from different natural systems (water discharges and cold wells from volcanic and geothermal areas, crater lakes) in central-southern Italy.


Page:
849-857


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