ISO 18073:2004规定了一种使用高分辨率气相色谱/高分辨率质谱法（HRGC/HRMS）测定水和废水（固体含量小于1%）中四至八氯二苯并对二恶英（PCDDs）和二苯并呋喃（PCDFs）的方法。规定了目前可以在不存在干扰的情况下确定多氯二苯并对二恶英/多氯二苯并呋喃的最低水平。这种方法是“基于性能的”。如果满足所有性能标准，则允许分析员修改方法以克服干扰或降低测量成本。给出了建立方法等效性的要求。

ISO 18073:2004 specifies a method for the determination of tetra- to octa-chlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in waters and waste waters (containing less than 1 % by mass solids) using high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS). The minimum levels (MLs) at which the PCDDs/PCDFs can currently be determined with no interferences present are specified. This method is "performance based". The analyst is permitted to modify the method to overcome interferences or lower the cost of measurements, provided that all performance criteria are met. The requirements for establishing method equivalency are given.