有机锡化合物对底栖动物的急性毒性研究

研究有机锡化合物的摇蚊幼虫等４种底栖动物的急性毒性作用，包括致死浓度（ＬＣ）和致死时间（ＬＴ）。结果表明：①３种丁基锡化合物的毒性依次是三丁基锡（ＴＢＧ）＞二丁基锡（ＤＢＴ）＞单丁基锡（ＭＢＴ）。②ＴＢＴ对羽摇蚊幼虫的２４ｈＬＣ５０为２６．８６×１０＾－９；对六附器毛突摇蚊幼虫的２４ｈＬＣ５０为２４１．５５×５０－９；对苏氏尾鳃蚓的２４ｈＬＣ５０为１４５．５５×１０＾－９；对霍甫水丝蚓的２４ｈＬＣ

Acute Toxicity of Organotin Compounds to Benthos

The acute toxicities of three organotin compounds, i.e., monobutyltin (MBT ), dibutyltin (DBT ) and tributyltin (TBT ), to benthos (Chironomid larvae and tubificids) were reported. The results show that (1 ) the toxic effects of these compounds in a decreasing order were TBT > DBT > MBT; (2 ) the median lethal concentration (24h LC_(50)) of TBT to 4species of benthos was 26. 85 ppb for chironomid larvae (Cllironomlis plumosus ), 241. 55 ppb for chironomid larvae (Chaetocladius sexpapilosus ),145. 55 ppb for tubificids (Branchiura sowerbyi), and 355. 63 ppb for tubificids (Limnodrilus hoffmesteri);(3) there was a strong negative correlation between the concentration of TBT and the median lethal time (LT_(50)) for B. sowerbyi.