Arsenic Biogeochemistry Affected by Eutrophication in Lake Biwa, Japan

Autor:	Hiroshi Hasegawa, Munetsugu Kawashima, Masashi Hojo, Masakazu Matsui, Yoshiki Sohrin
Rok vydání:	1997
Předmět:	Chlorophyll a Ecology Phosphorus media_common.quotation_subject chemistry.chemical_element Biogeochemistry General Chemistry Biology chemistry.chemical_compound Speciation chemistry Environmental chemistry Environmental Chemistry Photic zone Eutrophication Arsenic Arsenite media_common
Zdroj:	Environmental Science & Technology. 31:2712-2720
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es960846w
Popis:	The seasonal variations of arsenic species in lake water were studied in the mesotrophic northern and eutrophic southern basins of Lake Biwa in Japan. Within the euphotic zone, arsenite [As(III)] increased in spring and fall, and dimethylarsinic acid [DMAA(V)] became the dominant form in summer. Measurable concentrations of monomethylarsonic acid [MMAA(V)] and trivalent methylarsenic species [monomethylarsonous acid, MMAA(III), and dimethylarsinous acid, DMAA(III)] also appeared, although they were always minor fractions. The total arsenic concentration in the euphotic zones remained constant in the northern basin throughout the year. However, it was increased by 2−4 times in the southern basin in summer. The enhancement was caused by the increase of As(V), which was accompanied by the increase of iron, manganese, and phosphorus. The concentration of methylarsenicals per chlorophyll a was lower in the southern basin. These results indicate that the variations of arsenic species in lake water largely depen...
Databáze:	OpenAIRE
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