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

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

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—51．15ng·g^-1，均值为18．16ng·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—31．99ng·g^-1，均值为12．36ng·g^-1，其中1，4-DCB和HCB分别占51．5％和14．9％．土壤中∑CBs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（BCFa）随CBs挥发能力[lg（VP／KOW）的增强而降低，随CBa辛醇／空气分配系数（KOA）的增大而升高．

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·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·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 ≤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（ VP/KOW ）], and increased with increasing KOA.