Methods of test for petroleum and its products - petroleum products and used oils - determination of pcbs and related products - separation and determination of selected pcb congeners by gas chromatography using an electron capture detector 石油及其制品试验方法.石油产品和用过的油. pcbs及相关产品的测定.通过带电子俘获探测器的气相色谱法分离和测定选定的pcb同种类物