中南大学学报（自然科学版）2011，Vol.42Issue(2)：546-554,9.
烃基黄药捕收剂的生物降解性评价
Evaluation of biodegradability of alkyl xanthates flotation collecters
摘要
Abstract
The biodegradability of alkyl xanthates was evaluated by the methods of BODs/CODCr, static-flasks test and OECD-301B(ISO 9439) according to the testing standard for biodegradability of surfactants and other organic compounds. Meanwhile, the influence of molecular structure on biodegradability was studied. Finally, the biodegradation mechanism ofalkyl xanthates was preliminarily explored. The results show that the mass concentration rate of BOD5 and CODCr of ethyl xanthate, butyl xanthate, amyl xanthate, isopropyl xanthate and isobutyl xanthate are all less than 0.25,the biodegradation extent can reach 39.54％, 36.88％, 34.09％, 29.17％ and 26.79％, respectively. The index of biodegradability can reach 101.020 0, 99.019 9, 88.717 5, 79.125 6, and 71.897 5, respectively in 28 d, and they have some inhibiting effects on microorganisms, the suppressed time is 12, 13, 15, 17, 18 d, respectively. Xanthates are difficult to degrade by microorganisms, and the order from strong to weak of the magnitude of the biodegradability is as follows: ethyl xanthate, butyl xanthate, amyl xanthate, isopropyl xanthate and isobutyl xanthate. Compared to alkyl chain length, the branched chains have more significant effects on the degradability of xanthates. CS2, xanthic acid and thiocarbonate are the main product of biodegradation of xanthates, in which a small amount of oil-like droplet dixanthate is produced.关键词
烃基黄药/生物降解性/分子结构/机理分类
资源环境引用本文复制引用
陈绍华,龚文琪,梅光军,陈晓东,鄢恒珍..烃基黄药捕收剂的生物降解性评价[J].中南大学学报（自然科学版）,2011,42(2):546-554,9.基金项目
国家高技术研究发展计划("863"计划)项目(2007AA06Z123) （"863"计划）
武汉理工大学自主创新研究基金资助项目(2010-YB-16) （2010-YB-16）
