本标准规定了燃烧和化学反应产生并排放至烟道的烟气中四至八氯二苯并对二恶英、四至八氯二苯并呋喃和类二恶英多氯联苯的测定方法，使用气相色谱仪/质谱仪（以下简称GC-MS）在固定源排放中的烟囱或管道（以下简称管道）。本标准中使用的GC-MS应为双聚焦质谱仪（以下简称MS），其中使用气相色谱仪（以下简称GC）的毛细管柱，其分辨率为10000或更高。

This Standard specifies a method for the determination of tetra-through octachlorodibenzo-p-dioxins, tetra-through octachlorodibenzofurans and dioxin-like PCBs in flue gas which are generated by combustion and chemical reactions, and discharged to a flue, stack or duct (hereafter referred to as duct) in stationary source emissions using a gas chromatograph/mass spectrometer (hereafter referred to as GC-MS). The GC-MS employed in this Standard shall be the double-focusing mass spectrometer (hereafter referred to as MS) where the capillary column of a gas chromatograph (hereafter referred to as GC) is used and its resolution is 10 000 or more.