岩矿测试Issue(6)：863-870,8.DOI:10.15898/j.cnki.11-2131/td.2014.06.017
应用单体碳同位素分析技术探析农田土壤中多环芳烃的植物降解过程
Study on the Phytodegradation of PAHs from Farmland Soil Using Compound-Specific Isotope Analysis Technique
摘要
Abstract
For the research on degradation and remediation of soil polycyclic aromatic hydrocarbons (PAHs ) pollutants,researchers have been trying to find an effective method to quantitate the dynamic processes.Many approaches have been designed,such as spiked experiment,concentrations comparison before and after the degradation,and modeling calculations.However,all of this culminates in contradictory results and lack of corroboration of the actual environment.Compound-Specific Isotope Analysis (CSIA)technique is used in this study to investigate the phytodegradation process of soil PAHs with maize as the testing plant.Total concentrations of 1 6 PAHs in the blank soil,rhizosphere soil and the controlled soil samples were (299.8 ±37.9)ng/g,(272.2 ±1 1 .6)ng/g,and (281 .5 ±34.7)ng/g,respectively,all lower than the original cultivating soil (380.8 ng/g). The soil PAHs concentrations did not show significant decline tendency during the maize growing period,except for PAHs compounds below 3-ring which was consistent with the accumulation effect of the 3-ring PAHs in maize roots and leaves.The δ13C value of 6 PAHs compounds ranged from -34.31‰to -23.95‰with fluctuations between-9.0‰ --0.6‰,and all δ13 C values turned lighter with maize plants growing except that of pyrene.No significant correlation between δ1 3 C and the concentration of 4-,5-ring PAHs was observed during the maize cultivating process. Most research indicates that PAHs and other macromolecular compounds strongly resist phytodegradation,which illustrates less obvious carbon isotope fractionation.PAHs compounds below 3-ring would degrade more easily and the isotope fractionate more significantly than those of other macromolecular compounds, thus maing CSIA technique more advantageous for understanding the transportation pathway of these compounds.关键词
单体碳同位素技术/农田土壤/多环芳烃/植物降解/同位素分馏Key words
Compound-Specific Isotope Analysis (CSIA )/farmland soil/polycyclic aromatic hydrocarbons (PAHs)/phytodegradation process/isotopic fractionation分类
化学化工引用本文复制引用
焦杏春,王广,叶传永,曹红英,王晓春,杨永亮,刘晓端..应用单体碳同位素分析技术探析农田土壤中多环芳烃的植物降解过程[J].岩矿测试,2014,(6):863-870,8.基金项目
国家自然科学基金项目（40703029，41171370）；中国地质调查局工作项目 （）
