Detail of GB/T 39560.302-2024

Introduction of GB/T 39560.302-2024

GB/T 39560.302-2024 Determination of certain substances in electrical and electronic products - Part 3-2: Screening fluorine, chlorine and bromine in polymer and electronics by combustion-ion chromatography (C-IC) 1 Scope This document specifies the screening analysis of fluorine,chlorine and bromine in polymers and electronics using combustion-ion chromatography (C-IC).A C-IC screening analysis procedure for iodine can be found in Annex D. Note 1: Appendix A provides a combustion method for screening halogen (gas, chlorine, bromine, and iodine) content in polymers and electronic components using oxygen bomb combustion ion chromatography. Note 2: Appendix B provides a combustion method for screening halogen content in materials by combustion in a closed system containing oxygen [oxygen bottle combustion (Schoeniger flask)], as well as subsequent ion chromatography analysis of combustion products. This test method has been evaluated for ABS (acrylonitrile butadiene styrene),EMC(epoxy moulding compound),PE(polyethylene)and PC(polycarbonate)within the concentration ranges as specified in Table 1,Table 2 and Table 3.(Detailed results are shown in Table E.1 to Table E.6,and in Annex F(Table F.1 and Table F.2). The use of this method for other types of materials or concentration ranges outside those specified below in Tables 1-3 has not been evaluated. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696 Water for analytical laboratory use - Specification and test methods IEC 62321 -2 Determination of certain substances in electrotechnical products - Part 2: Disassembly, disjunction and mechanical sample preparation ISO 10304-1:2007 Water quality - Determination of dissolved anions by liquid chromatography of ions - Part 1: Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: ——IEC Electropedia: available at http://www.electropedia.org/ ——ISO Online browsing platform: available at http://www.iso.org/obp 3.1.1 accuracy closeness of agreement between a test result and an accepted reference value Note: The term accuracy, when applied to a set of test results, involves a combination of random components and a common systematic error or bias component. [SOURCE: GB/T 6379.1-2004, 3.6, modified.] 3.1.2 precision closeness of agreement between independent test results obtained under stipulated conditions [SOURCE: GB/T 6379.1-2004, 3.6, modified.] 3.1.3 repeatability precision under repeatability conditions [SOURCE: GB/T 6379.1-2004, 3.6, 3.13] 3.1.4 repeatability limit r value less than or equal to which the absolute difference between two test results obtained under repeatability conditions may be expected to be with a probability of 95 % [SOURCE: GB/T 6379.1-2004, 3.6, 3.16] 3.1.5 reproducibility precision under reproducibility conditions [SOURCE: GB/T 6379.1-2004, 3.6, 3.17] 3.1.6 reproducibility limit R value less than or equal to which the absolute difference between two test results obtained under reproducibility conditions may be expected to be with a probability of 95 % [SOURCE: GB/T 6379.1-2004, 3.20] 3.1.7 screening analytical procedure to determine the presence or absence of substances in the representative part or section of a product, relative to the value or values chosen as the criterion for presence, absence or further testing Note: If the screening method produces values that are not conclusive, then additional analysis or other follow up actions may be necessary to make a final presence/absence decision [SOURCE: GB/T 39560.1-2020, 3.1.10] 3.1.8 test sample sample prepared from the laboratory and from which test portions will be taken [SOURCE: ISO 6206:1979, 3.2.13] 3.1.9 test portion quantity of material drawn from the test sample (or from the laboratory sample if both are the same) and on which the test or observation is actually carried out [SOURCE: ISO 6206:1979, 3.2.14] 3.2 Abbreviated terms ABS: acrylonitrile butadiene styrene CCV: continuing calibration verification CD: conductivity detector C-IC: combustion-ion chromatography CRM: certified reference material EMC: epoxy moulding compound IC: ion chromatography ICV: initial calibration verification IS: internal standard IUPAC: International Union of Pure and Applied Chemistry KRISS: Korea Research Institute of Standards and Science LCS: laboratory control sample LCSD: laboratory control sample duplicate LOD: limit of detection LOQ: Limit of quantification MDL: method detection limit PC: polycarbonate PE: polyethylene PP: polypropylene SOP: standard operation procedure 4 Principle A sample of known weight or volume is placed into a sample boat and introduced at a controlled rate into a high-temperature combustion tube. There the sample is combusted in an oxygen- rich pyrohydrolytic environment. The gaseous by-products of the combusted sample are trapped in an absorption medium where the hydrogen halide (HF, HCl, HBr) formed during the combustion dissociates into its specific anion (F-, Cl-, and Br-) and cation (H30+). An aliquot of known volume of the absorbing solution is then manually or automatically injected into an ion chromatograph (IC) by means of a sample injection valve. The halide anions, including fluoride, chloride and bromide are separated into individual elution bands on the separation column of the IC. The conductivity of the eluent is reduced with an anion suppression device prior to the ion chromatograph’s conductivity detector, where the anions of interest are measured. Quantification of halogen in the original combusted sample is achieved by calibrating the system with a series of standards containing known amounts of fluoride, bromide and chloride and then analysing unknown samples under the same conditions as the standards. The combined system of pyrohydrolytic combustion followed by ion chromatographic detection is referred to as combustion-ion chromatography (C-IC).

Contents of GB/T 39560.302-2024