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The oxidation of H 2 S in Framvaren Fjord
Author(s) -
Millero Frank J.
Publication year - 1991
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1991.36.5.1007
Subject(s) - anoxic waters , fjord , seawater , chemistry , environmental chemistry , analytical chemistry (journal) , mineralogy , geology , oceanography
The oxidation of H 2 S with O 2 was measured in Framvaren Fjord at 25°C. The measurements were made on mixtures of surface waters and waters collected from below the anoxic interface (20 m). Measurements were also made on deep waters after a rapid equilibration with air. Oxidation rates varied according to the concentration of Fe(II) and Mn(II) in the solutions, in agreement with earlier studies. For waters collected at the particle maximum (22 m) t 1/2 = 20 min for poisoned and unpoisoned samples. The intermediates SO 3 2‒ and S 2 O 3 2‒ were followed along with the disappearance of H 2 S during the course of oxidation. The formation of the intermediates was modeled with the overall rates of oxidation of ( k 1 ) and SO 3 2‒ ( k 2 ) and the formation of S 2 O 3 2‒ ( k 3 ). The values were all larger than found for seawater. These results indicate that Fe(II) and Mn(II) also affect the oxidation of SO 3 2‒ and the formation of S 2 O 3 2‒ in anoxic waters. The deep waters contained concentrations of H 2 S as high as 6,000 µ M . Low levels of SO 3 2‒ and S 2 O 3 2‒ were found near the anoxic interface. Quite variable levels (1–35 µ M) of what is thought to be S 2 O 3 2‒ were found in the deep waters. No SO 3 2‒ was detected below the interface.