Petroleum products and used oils. Determination of polychlorinated biphenyls (PCB) and related products. Part 3. Determination and quantification of polychlorinated terphenyls (PCT) and polychlorinated benzyl toluenes (PCBT) content by gas chromatography (GC) using an electron capture detector (ECD)
State system for ensuring the uniformity of measurements. State verification schedule for means measuring the amplitude modulation factor of high frequency oscillations