摘要
构建"铁/腐殖质还原菌(Comamonas koreensis,CY01)、腐殖质模式物、铁氧化物、2,4-D"厌氧反应体系,研究2,4-D转化效率与转化途径,探讨2,4-D转化促进机制。结果表明,CY01对2,4-D的直接脱氯效果微弱,蒽醌-2,6-二磺酸钠(AQDS)与针铁矿(α-FeOOH)的加入可有效促进2,4-D厌氧转化,25 d时降解率提高2倍,达33.3%。CY01/AQDS/α-FeOOH/2,4-D体系中,AQDS、Fe(Ⅲ)及2,4-D微生物还原3种过程同时存在,AQDS和Fe(Ⅲ)充当电子穿梭体,加速胞内电子向胞外2,4-D的转移,协同促进2,4-D还原脱氯。本研究可为难降解有机氯农药污染土壤的修复研究提供借鉴。
The biotransformation of 2,4-D was studied in an anaerobic system of Fe（Ⅲ）/humus-reducing bacteria（Comamonas koreensis,CY01）/humus analog/iron oxide/2,4-D.The results showed that the CY01 biotic system alone exhibited low 2,4-D dechlorination rate,and the rate was significantly accelerated by the presence of iron oxide（α-FeOOH） and humus analog（sodium anthraquinone-2,6-disulphonate,AQDS）.On the 25th day,2,4-D biodegradation efficiency increased two times to 33.3% in the CY01/AQDS/α-FeOOH treatment than in CY01 biotic treatment.Fe（Ⅲ）/AQDS reduction and 2,4-D biodegradation by strain CY01 occurred simultaneously.AQDS and α-FeOOH could severed as the electron shuttles between the strain CY01 and 2,4-D to facilitate 2,4-D reductive dechlorination.The study would be helpful for exploring in-situ remediation strategies of organic chlorine pesticides-contaminating sites in iron oxide or humus-rich environments.
出处
《现代农药》
CAS
2012年第5期15-19,共5页
MODERN AGROCHEMICALS
基金
国家自然科学基金资助项目(41101477)
关键词
铁/腐殖质还原菌
2
4-D
电子穿梭体
还原脱氯
Fe（Ⅲ）/humus-reducing bacteria
2
4-D
electron shuttle
reductive dechlorination
