高锰酸钾及氯化锰对日本青鳉的急、慢性毒性

Toxic Effects of Potassium Permanganate and Manganese Chloride on the Early Life Stage of Japanese Medaka(Oryzias latipes)

饮用水生产中投加高锰酸钾可能引起高锰酸钾及其副产物二价锰的毒性效应.利用日本青鳉的胚胎-幼鱼发育阶段评价了以高锰酸钾为预氧化剂的饮用水生产工艺安全性.结果表明,高锰酸钾对日本青鳉的LC50-96h为1.48mg·L-1.慢性暴露中,对孵化时间影响的最低可观察效应浓度(LOEC30d)为0.1mg·L-1;暴露于0.4mg·L-1的高锰酸钾对30d后日本青鳉的体长、体重、累计死亡率均有显著影响,但对孵化率率无显著影响.氯化锰(Mn2+)对日本青鳉的LC50-96h为550mg·L-1,对体重影响的LOEC30d为3.2mg·L-1.当高锰酸钾的使用浓度在0.5～1.5mg·L-1之间,其在滤后水中的高锰酸钾残余浓度低于检出限,而降解中间体产物Mn2+浓度小于0.5mg·L-1,均低于本文报道的LOECs数值.

In this study, the early stage development of Japanese medaka （Oryzias latipes）was used to assess the toxic effects of potassium permanganate and its byproduct Mn2＋ in the drinking water process. Results showed that the 96-h LC50 for potassium permanganate （LC50-96h）was 1.48mg·L-1 in the acute exposure and the 30-d lowest observed effect concentration （LOEC30d）regarding to incubation time was 0.1mg·L-1 in the chronic exposure. In chronic exposure, significant changes in length, weight and cumulative mortality rate of fish was observed at concentrations higher than 0.4mg·L-1, but no effect on hatchability. For manganese chloride, the LC50-96h was 550mg·L-1 and LOEC30d regarding to body weight was 3.2mg·L-1. When 0.5～1.5mg·L-1 of potassium permanganate was applied in the drinking water process, its residual in finished water was under detection limit and its byproduct Mn2＋ was less than 0.5mg·L-1, both were lower than the reported LOECs.