Measurement of in situ rates of selenate removal by dissimilatory bacterial reduction in sediments

Environmental Science & Technology
By: , and 

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Abstract

A radioisotope method for measurement of bacteria respiratory reduction of selenate to elemental selenium in aquatic sediments was devised. Sediments were labeled with [75Se]selenate, incubated, and washed, and 75Se0(s) was determined as counts remaining in the sediments. Core profiles of selenate reduction, sulfate reduction, and denitrification were made simultaneously in the sediments of an agricultural wastewater evaporation pond. Most of the in situ selenate reduction (85%) and all the denitrificatation activities were confined to the upper 4-8 cm of the profile, whereas sulfate reduction was greatest below 8 cm (89% of total). The integrated areal rate of selenate reduction was 301 mol m-2 day-1, which results in a turnover of water column selenate in 82.4 days.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Measurement of in situ rates of selenate removal by dissimilatory bacterial reduction in sediments
Series title Environmental Science & Technology
DOI 10.1021/es00078a001
Volume 24
Issue 8
Year Published 1990
Language English
Publisher ACS
Contributing office(s) Toxic Substances Hydrology Program
Description 8 p.
First page 1157
Last page 1164