北京东南郊化工区土壤和植物中氯苯类有机物的残留及分布特征

对2003-11采自北京东南郊化工区的土壤、植物样品中11种氯苯类有机物进行了分析测定. 结果表明,土壤（干重）中氯苯类有机物（CBs）的总量范围为0.232～51.15 ng·g^-1,均值为18.16 ng·g^-1,其中1,2-DCB、1,4-DCB和HCB分别占45.2％、15.3％和17.1％;植物（干重）中CBs的总量范围为5.635～31.99 ng·g^-1,均值为12.36 ng·g^-1,其中1,4-DCB和HCB分别占51.5％和14.9%. 土壤中∑CBsi>与土壤有机质含量的皮尔森（Pearson）相关系数为0.544（P≤0.05）,呈弱正相关关系. 此外,除1,4-DCB和1,2,4-TCB外,云杉针叶中CBs的土壤-植物富集因子（BCFs）随CBs挥发能力［lg(V_P/K_OW)的增强而降低,随CBs辛醇/空气分配系数（K_OA）的增大而升高.

Residues and Distribution Characters of Chlorobenzenes in Soil and Plants from Beijing Southeast Chemical Industry Zone

Eleven chlorobenzenes (except MCB of a total of 12 in the congener series, CBs) in soil and plant samples collected from Beijing southeast chemical industry zone were analyzed. The range of total chlorobenzenes was 0.232 - 51.15 ng x g(-1) in soil (dry weight), among which 1,2-DCB, 1,4-DCB and HCB occupy 45.2%, 15.3% and 17.1% respectively; while 5.635 - 31.99 ng x g(-1) in plants (dry weight), among which 1,4-DCB and HCB occupy 51.5% and 14.9%. Total CBs concentrations in soil were positive related with soil organic matter (r = 0.544, p < or = 0.05). Soil-to-spruce needle bioconcentration factors (BCFs) of CBs were calculated and their relationships with CBs' physicochemical properties were investigated. Except for 1,4-DCB and 1,2,4-TCB, the CB BCF into spruce needle generally decreased with increasing volatilization potential lg (V(p)/K(ow))], and increased with increasing K(OA).