Characteristics of PCB congeners and homologues in Chinese transformer oil
Characteristics of PCB congeners and homologues in Chinese transformer oil
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发表时间：
2007
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通讯作者：
Liao Yifan
中科院分区：
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作者：
Liao Yifan
采用气相色谱-质谱联用技术（GC-MS）对国产Transformer油中的84种多氯联苯同系物进行了分析，并估算了国产Transformer油中二恶英类多氯联苯的国际毒性当量（TEQ）。CB同系物在PCBs总量中占63%，其次为Cl_4-CB和Cl_2-CB，分别占PCBs总量的24%和9%。低氯联苯是我国生产的Transformer油中多氯联苯的主要成分。中国Transformer油中PCBs的含氯量为42.9%，与Aroclor 1242（含氯量40%~42%）相近。我国Transformer油中检出的6种二恶英类多氯联苯含量均较低，占变压器油中二恶英类多氯联苯的1.6%。6种二恶英类多氯联苯的毒性当量（TEQ）约为5.53 μ g/mL，是Aroclor 1242的15%。在6种二恶英类PCBs中，CB-77的毒性当量值最高，占总毒性当量的72%，其次是CB-105（15%）和毒性最强的同系物CB-126（8%）。
Eighty-four PCB congeners in transformer oil produced in China were analyzed by gas chromatography mass spectrum (GC-MS) and the international toxicity equivalents (TEQ) indioxin-like PCBs found in Chinese transformer oil were also estimated. The major CB homologue in the total PCBs was Cl3-CB (63%) followed by Cl4-CB and Cl2-CB, accounted for 24% and 9% of ΣPCB, respectively. Low chlorinated biphenyls were the major components of the PCBs in transformer oil produced in China. PCBs in Chinese transformer oil contained 42.9% chlorine, similar to the Aroclor 1242 (contains 40%～42% chlorine). The concentrations of the 6 dioxin-like PCBs found in Chinese transformer oil were low, accounted for 1.6% of ΣPCB. The TEQ of the 6 dioxin-like PCBs was approximately 5.53 μg/mL which was 15% of those found in Aroclor 1242. Among the 6 dioxin-like PCBs, CB-77 had the highest TEQ value, which was 72% of total TEQ, and followed by CB-105 (15%) and the most toxic congener CB-126 (8%).