Primary CB-28 Emission and Residues in China Due to Their Use in Power Transformers and Capacities

【摘要】：正1.Introduction PCBs were manufactured in China from 1965 until 1974 when they were banned.Over this period, approximately 10000 t of PCBs were produced,of which 9000 t as trichlorobiphenyl,known as no.1 PCB,and 1000 t as pentachlorobiphenyl,no.2 PCB(1).Trichlorobiphenyl was used primarily in power transformers and capacitors,while pentachlorobiphenyl was used mainly as a paint additive(2). This paper studies the primary emissions and soil residues of PCBs in China due to the use of PCBs in power transformers and capacitors.