摘要
为了解天然水体沉积物中六六六(HCHs)的自然生物降解行为,采集海河沉积物进行了实验室研究.结果表明:HCHs在海河表层沉积物及水/沉积物界面层中的生物降解均符合一级动力学方程,α-HCH、β-HCH、γ-HCH和δ-HCH的生物降解速率常数分别为1.45×10-2~6.02×10-2 d-1、9.8×10-3~3.39×10-2 d-1、2.00×10-2~8.58×10-2 d-1和1.42×10-2~5.40×10-2 d-1;4种HCH异构体的降解顺序为γ-HCH>α-HCH>δ-HCH>β-HCH;厌氧条件下HCHs的降解速率高于好氧条件,温度升高降解速率增大;水/沉积物界面层中HCHs的生物降解速率,除好氧条件下α-HCH和γ-HCH外,均高于表层沉积物.
In order to understand the natural biodegradation behavior of hexachlorocyclohexane (HCHs) in sediments of natural water, laboratory experiments were performed with sediments collected from Haihe River. The results show that the biodegradation process of HCHs in surface sediments and water-sediment interface of Haihe River fitted well with the first-order equation,and biodegradation rate constants were in the range of 1.45×10^- 2-6.02×10^- 2 d^-1 for α-HCH,9.8×10^- 3-3.39×10^- 2 d^- 1 for β-HCH,2.00×10^- 2- 8.58×10^-2 d^-1 for γ-HCH,and 1.42×10^- 2-5.40×10^-2 d^-1 for δ- HCH,respectively. The order of the biodegradability of the 4 HCH isomers is γ-HCH〉α-HCH〉δ-HCH〉β-HCH. Biodegradation rates of HCHs under anaerobic condition were higher than those under aerobic condition, and increased with the increase of temperature. Biodegradation rates of HCHs in water-sediment interface were higher than those in surface sediments except for α-HCH and γ-HCH under aerobic condition.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2010年第4期329-332,共4页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金资助项目(20677042
20777052)
关键词
六六六
沉积物
生物降解
海河
hexachlorocyclohexane (HCHs)
sediments
biodegradation
Haihe River