有机硅助剂Breakthru S240对大型溞的毒性研究

参照OECD推荐的化学品对水生生物的标准试验方法,测定了有机硅助剂Breakthru S240对大型溞Daphnia magna的急性、慢性毒性和胚胎毒性,以期综合评价有机硅助剂对大型溞的毒性效应.结果表明:有机硅助剂对大型溞的48h-LC50值为1.218mg/L,为中毒.21d慢性毒性结果显示,有机硅助剂对大型溞的产溞量、产溞胎数、21d体长和蜕皮次数都有显著的影响,且随着处理浓度的增大而更加明显.母溞暴露Breakthru S240后,对F1(1st)代的生长和繁殖没有显著影响,但F1(3rd)代的恢复比F1(1st)代差,虽然Breakthru S240对F1(3rd)代生长影响不大,但对其繁殖有显著影响.这可能与母溞的暴露时间有关.另外,高浓度有机硅助剂对大型溞胚胎发育也存在一定的威胁,孵化抑制率高达68.50%.

Toxicity of organic silicon adjuvant Breakthru S240 to Daphnia magna

In order to evaluate the safety of the organic silicon adjuvant Breakthru S240 on Daphnia magna, this study investigated the acute toxicity, chronic toxicity and embryo toxicity, according to the commendatory standard test method namely experimental guideline for environmental safety evaluation of chemical pesticide. The 48h-LC50 value of the organic silicon adjuvant to D. magna was 1.218 mg/L, which belongs to the medium toxicity. The 21day chronic toxicity test showed that, the organic silicon adjuvant could significantly affect the breeding, length and sex differentiation, and the efficiency was more evident with the increase of concentration. The impact was not obvious for the growth and of F1(1st) after F0 being exposed to the organic silicon adjuvant. But it still showed significant differences for reproduction of F1(3rd) compared with the control group. It maybe have relationship with the exposed time. In addition, the organic silicon adjuvant had potential hazard to the development of embryo of D. magna and the inhibition rate reached to 68.50%.