BS EN 12766-3-2004 石油产品和用过的油.PCB和相关产品的测定.使用电子俘获探测器(ECD)的气相色谱法(GC)测定和量化多氯三联苯(PCT)和多氯苯基甲苯(PCBT)含量

       This document specifies a method of test for the determination of polychlorinated terphenyls (PCT) and polychlorinated benzyl toluenes (PCBT) in petroleum products and related materials by means of a specified gas chromatographic separation procedure. Following the gas chromatographic separation, quantification procedures are described for PCT Aroclor 5442, PCT Aroclor 5460 and PCBT (Ugilec 141). This document is applicable to unused, used and treated (e.g. dechlorinated) petroleum products including synthetic lubricating oils, to petroleum products and synthetic lubricating oils suitably recovered from other materials (e.g. from waste materials) and to mixtures of vegetable oils. NOTE 1 This document has been developed as an extension of EN 12766 Parts 1 and 2 to provide a method of determining the total PCB content in accordance with Articles 2, 3 and 4 of EC Directive 96/59/EC [1]. The total PCB content is calculated by summation of PCB content, determined according to EN 12766-2, and PCTs and PCBTs according to this document. The three classes of materials measured in this standard can be quantified if they occur at concentrations greater than given in Table 1. NOTE 2 In order to simplify and rationalize the analytical operations required for an effective, fast and economic inventory of equipment containing liquids classified as PCBs (as defined by Directive 96/59/EC [1]), it is recommended firstly to determine, using an appropriate screening method, the total chlorine content (in mg/kg). Examples for analytical procedures to determine total chlorine content in fresh, used, or treated insulating oils are: i) pre-dosed colorometric kits to measure 25 mg/kg or 50 mg/kg total chlorine (ref: US EPA SW-846 Method 9079); ii) electrochemical methods in the range 2 mg/kg to 2 000 mg/kg of total chlorine (ref: DEXSIL L-2000 DXC - US EPA SW-846 Method 9079 and US EPA SW-846 Method 9078); iii) wavelength dispersive X-ray fluorescence; or iv) oxidative microcoulometry or other scientifically validated analytical methods. From the total chlorine measured for a specific sample, a theoretical maximum equivalent PCB content can be calculated. When this maximum equivalent PCB content is significantly lower than the limit prescribed by Directive 96/59/EC [1] (50 mg/kg total PCBs) or by local standards (e.g. 25 mg/kg total PCBs), the sample may be considered as "PCB-free". NOTE 3 When the total chlorine content in a sample is higher than the limits described above, it becomes necessary to proceed with gas chromatographic analysis in accordance with this document using the total chlorine content as: i) a guide to establish the level of dilution necessary to operate within the linear range of the ECD detector (EN 12766-1:2000, 10.3.2); ii) a method of calculating the ratio between total chlorine content and total PCB for quality control purposes; iii) a method for the classification of the hazard posed by the oil (e.g. at the end of its life cycle, for regeneration, use as fuel and/or disposal in accordance with local regulations). NOTE 4 For the purposes of this document, the terms "% (m/m)" and "% (V/V)" are used to represent respectively the mass fraction and the volume fraction. WARNING —The use of this document can involve hazardous materials, operations and equipment. This document does not purport to address all the safety problems associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.