Abstract
The two main conditions for the formation of sulphidic seawater are the restriction of water exchange and the input of decomposable organic matter. The stoichiometry of sulphate reduction gives a relation between titration alkalinity and sulphide concentration, which, however, is not the one found experimentally in the Black Sea. Computer analysis of the potentiometric titration of sulphide with mercury chloride elucidates the two equivalence points. The difference between them gives the concentration of thiols. The concentrations of trace metals should increase with increasing sulphide concentration, owing to the formation of disulphide complexes. Scavenging by iron sulphide may explain the low concentrations of trace metals in sulphidic seawater. Calculations on titration alkalinity indicate a slow build-up of excess alkalinity in stagnant sulphidic basin waters.
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