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Toxicity, silver accumulation and metallothionein induction in freshwater rainbow trout during exposure to different silver salts
Author(s) -
Hogstrand Christer,
Galvez Fernando,
Wood Chris M.
Publication year - 1996
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620150713
Subject(s) - rainbow trout , gill , silver nitrate , metallothionein , bioaccumulation , chemistry , silver chloride , trout , toxicity , nuclear chemistry , chloride , freshwater fish , environmental chemistry , fish <actinopterygii> , cadmium , biology , fishery , organic chemistry , electrode
Static‐renewal 168‐h toxicity tests of silver nitrate (AgNO 3 ), silver chloride (AgCl n ), and silver thiosulfate (Ag(S 2 O 3 ) n ) with juvenile rainbow trout (Oncorhyncus mykiss) were performed by standard methods. Because of low solubility of AgCl(s), bioassays for AgCl n were performed in two separate ways. In one test series, AgCl(s) was added to freshwater and in another, AgCl n (aq) was generated by adding AgNO 3 to freshwater supplemented with 50 mM NaCl. Concentrations of Ag and metallothionein (MT) were analyzed in gills and livers offish that survived the exposures. Although Ag added as AgNO 3 was found to be highly toxic to rainbow trout (168‐h LC50 = 9.1 μg Ag L −1 ), the toxicities of the other Ag salts were low. The 168‐h LC50 for Ag(S 2 O 3 ) n was 137,000 μg Ag L −1 and no mortality was observed in AgCl n (100,000 μg Ag L −1 ). Exposure to AgNO 3 , Ag(S 2 O 3 ) n , or AgCl n caused accumulation of Ag and induction of MT. Highest Ag levels were found in livers of trout exposed to 164,000 μg Ag L −1 as Ag(S 2 O 3 ) n . In these fish, the hepatic Ag concentration was increased 335 times from the control value. The MT levels in gills and liver increased with the water Ag concentration and the highest level of MT was found in liver of fish exposed to Ag(S 2 O 3 ) n .