PBS基共聚物及其模拟降解产物对赤子爱胜蚓急性生态毒性的研究

采用滤纸接触法和自然土壤法,通过急性毒性实验分别研究了20℃时不同分子量PBS（聚丁二酸丁二醇酯poly（butylene succinate））基聚合物及其模拟降解产物二元酸、二元醇对赤子爱胜蚓（Eisenia foetida）的存活和生长的影响。研究结果表明：48 h内二元酸、二元醇质量浓度在低于3 400 mg.L-1时对蚯蚓的存活没有影响,滤纸接触法测得丁二酸、己二酸、1,4-丁二醇、1,6-己二醇对蚯蚓的LC50分别为：3 523、3 402、74 907、18 160 mg.L-1;在自然土壤实验中,相比空白实验,蚯蚓在含有不同分子量、不同质量分数的PBS及PBS-co-HS、PBS-co-BA土壤中经过14 d的培养,体质量明显增加,且所有的蚯蚓没有任何病状或伤口出现。以上结果表明PBS基聚合物对该物种是安全的。

The effect of acute ecotoxicity of PBS-based copolymer and its simulated degradation products on earthworm Eisenia fetida

Contact filter paper test and natural soil method were used to investigate the effects of acute ecotoxicity of poly（butylene succinate）-based copolymer and its simulated degradation products（diacids and diols） on earthworms Eisenia fetida at 20 ℃.The results showed that diacids and diols with concentration less than 3400 mg·L-1 had no effect on survival of earthworms within 48 h.The LC50 of succinic acid,adipic acid,1,4-butanediol and 1,6-hexanediol to earthworms Eisenia fetida by contact filter paper test were 3523,3402,74907,and 18160 mg·L-1,respectively.Comparing with the control test,the natural soil method showed weights of earthworms were significantly increased in soil which containing PBS-based copolymer with different Mn and different mass fraction（the mass percent of PBS、PBS-co-HS、PBS-co-BA were 15000、10000、5000、1000、0 mg·kg-1,respectively） after cultured for 14 days,and there were no indication of any pathology on earthworms.These results showed that PBS-based copolymer was safe for this specie.