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Seasonal Variation of Selenium in Outdoor Experimental Stream‐Wetland Systems
Author(s) -
Allen Kathleen N.
Publication year - 1991
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1991.00472425002000040026x
Subject(s) - wetland , streams , environmental science , hydrology (agriculture) , deposition (geology) , water column , seasonality , selenium , environmental chemistry , ecology , sediment , geology , chemistry , biology , computer network , geotechnical engineering , computer science , paleontology , organic chemistry
Two outdoor experimental stream‐wetland systems were exposed continuously to 10 µ g/L Se(IV) over a 2‐yr period. A seasonal variation in the water column Se concentration was found in wetlands; a comparable variation was not observed in the stream segments. Water column Se was never reduced by more than 20% in the streams, but was reduced by greater than 90% in midsummer in the wetlands. Accumulation of Se in plants was much higher in the wetlands than in the streams, particularly in duckweed ( Lerana minor ). The deposition of Se in sediments was extremely variable within the wetlands.