Sulphate reduction in the sediment of the Venice canals (Italy).

Abstract:

:The sulphur cycle in the sediment of the Venice canal network was investigated by considering the sulphate reduction rate (SRR) and the distribution of sulphur compounds, in both pore water and sediment. Sulphate reduction (SR) is the main process in the metabolism of the organic matter supplied to the network by untreated urban effluents. Although it might account for the decomposition of only a limited percentage of the total organic-C inputs, the estimated rates are among the highest observed in coastal sediments. Measured rates range from 0.26 to 0.99 micromolcm(-3)d(-1), while mean annual values, estimated by a diagenetic model, vary from 0.16 to 0.43 micromolcm(-3)d(-1). The speciation of S in the sediment reveals that pyrite-S is the most abundant component of the total reduced S pool, whereas acid volatile sulphides and elemental sulphur together account for less than 45%. A preliminary budget indicates that the rate of burial of solid-phase S is small compared to the S produced by SR (from 10 to 25%). A large amount of reduced S is then lost from the canal deposits to be re-oxidised at the sediment-water interface or in the overlying water column.

journal_name

Mar Pollut Bull

authors

Zaggia L,Rosso J,Zonta R

doi

10.1016/j.marpolbul.2007.09.004

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

415-24

issue

10-12

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(07)00316-5

journal_volume

55

pub_type

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