采用气相色谱-质谱法在选择离子方式下测定土壤中多氯联苯Aroclor系列Aroclor 1016、Aroclor 1221、Aroclor 1232、Aroclor 1242、Aroclor 1248、Aroclor 1254、Aroclor 1260.样品经正己烷-丙酮(体积比1比1)混合溶剂进行快速溶剂萃取仪提取后,经浓硫酸液-液分配,再经氟罗里硅土柱净化浓缩,洗脱液浓缩并定容至1 mL后,供气相色谱-质谱仪测定,外标法定量.回收率在76%~108%之间,相对标准偏差(n=7)小于13%.应用提出的方法分析了一个土壤标样物质,测定结果(2.19 mg·kg-1)与证书值(2.14 mg·kg-1)之间的相对误差为2.3%.以土壤样品为基体,加入十氯联苯替代物的标准溶液做回收试验,测得回收率在70%~120%之间.

7 Aroclors,namely Aroclor 1016,Aroclor 1221,Aroclor 1232,Aroclor 1242,Aroclor 1248,Aroclor 1254 and Aroclor 1260,in soil were determined by GC-MS under selective ion monitoring mode.The sample was extracted with n-hexane and acetone mixed in the ratio of 1 to 1 by rapid solvent extractor,and then partitioned with conc.H2SO4.The extract was purified by passing through florisil column.The eluate was concentrated and made up to 1 mL,which was used for GC-MS determination,with external standard method.Values of recovery were found in the range of 76%-108% with RSD′s (n=7) less than 13%.In application of the proposed method to the analysis of a CRM of soil,the relative error between the result obtained (2.19 mg·kg-1) and the certified value (2.14 mg·kg-1) was found to be 2.3%.Tests for recovery and precision were made by addition of standard solution of the substitute decachlorobiphenyl to a soil sample as matrix which was then analyzed by the proposed method.Values of recovery obtained were in the range of 70%-120%.