4种类型土壤中十溴二苯乙烷的光降解行为  

Photodegradation of Decabromodiphenyl Ethane in Four Different Soils

作　　者：高佳楠 王树涛 齐虹 单德鑫[1] 尤宏 GAO Jianan;WANG Shutao;QI Hong;SHAN Dexin;YOU Hong(College of Resources and Environment,Northeast Agricultural University,Harbin 150030,China;School of Environment,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]东北农业大学资源与环境学院,黑龙江哈尔滨150030 [2]哈尔滨工业大学环境学院,黑龙江哈尔滨150090

出　　处：《环境科学与技术》2021年第10期66-74,共9页Environmental Science & Technology

基　　金：黑龙江省自然科学基金(LH2020D010)。

摘　　要：为研究自然环境中十溴二苯乙烷(DBDPE)的光降解效果,文章以DBDPE为研究对象,紫外光和模拟自然光为光源,对比研究了来自不同地区4种典型类型土壤中DBDPE的光降解效果,并对四氢呋喃介质中的DBDPE降解机制进行分析。结果表明:紫外光对DBDPE的降解效果明显强于模拟自然光;土壤污染时间越长,越不利于DBDPE的紫外光降解;不同土壤类型中,光解速率由快到慢的顺序依次为风沙土>潮土>水稻土>黑钙土;DBDPE的光降解速率与p H和光强呈正相关,而与初始浓度和腐殖酸浓度呈负相关。通过液相色谱-三重四级杆质谱法鉴定了DBDPE的紫外光降解产物,主要包括脱溴和氧化产物的形成,并对降解途径(还原脱溴、乙基的C-C键的氧化和羟基取代)进行了推测。In order to study the photodegradation of decabromodiphenyl ethane(DBDPE) in natural environment, DBDPE was taken as the research object, UV and simulated natural light were used as light sources to study the photodegradation effects of DBDPE in four typical types of soils from different regions and the degradation mechanism of DBDPE in tetrahydrofuran was analyzed. The results show that the degradation of DBDPE by UV is better than that by simulating natural light. The longer the time of soil pollution, the more disadvantageous to the UV photodegradation of DBDPE. Among different soil types, the order of photolysis rate from fast to slow is eolian sandy soil > aquic soil > paddy soil > chernozem.The photodegradation rate of DBDPE was positively correlated with pH and light intensity, but negatively correlated with initial concentration and humic acid concentration. The UV degradation products of DBDPE were identified by liquid chromatography-triple quadrupole mass spectrometry(LC-MS/MS), mainly including the formation of debromination and oxidation products and the degradation pathways(reduction debromination, oxidation of C-C bond of ethyl group and hydroxyl substitution) were speculated.

关 键 词：十溴二苯乙烷 光降解 土壤修复 新型溴代阻燃剂 

分 类 号：X53[环境科学与工程—环境工程]