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土壤环境中LLDPE地膜残余物的高温索氏提取及堆肥降解评价

DOI: 10.3969/j.issn.1001-8395.2015.03.020, PP. 418-423

Keywords: 分离,高温索氏提取,LLDPE,土壤,降解,评价

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Abstract:

可降解LLDPE地膜降解后以粉末形式进入土壤的“降解”存在很大的争议,为了探究进入土壤的高分子残余物是否继续降解,通过高温索式提取法采用混合溶剂(V(正庚烷)∶V(二甲苯)=1∶4)对土壤中的LLDPE(Mw=120000)残余物进行分离提取,分别考察提取时间和土壤类型对LLDPE提取率及结构和热性质的影响,同时做堆肥实验并进行相对分子质量的测定.结果表明,对LLDPE的提取率随提取时间的增加而增大,最佳提取时间为4h,提取率75%;提取时间对LLDPE的分子结构\,结晶及平均重均相对分子质量均无明

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