本标准规定了使用气相色谱/质谱仪（以下简称GC-MS）测定工业用水和废水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方法。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或以上。

This Standard specifies a method for the determination of tetra-through octachlorodibenzo-p-dioxins, tetra-through octachlorodibenzofurans and dioxin-like PCBs in industrial water and waste water using a gas chromatograph/mass spectrometer (hereafter referred to as GC-MS). The GC-MS employed in this Standard shall be the doublefocusing 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.