Determination of chlorine and bromine in epoxy resins by online combustion ion chromatography
A method for the simultaneous determination of chlorine and bromine in epoxy resins by online combustion ion chromatography was developed.High-temperature pyrolysis furnace coupled with ion chromatography was used to decompose and gasify the samples at high temperature,and hydrogen peroxide(100 mg·L-1)was used as absorbent.The resulting hydrogen halide gas was absorbed and transformed into inorganic halogen anions,and the samples were separated and determined by ion chromatography,which was quantified by an external standard method using the peak area of chlorine and bromine.Parameters that affect the combustion effect and the accuracy of the results such as combustion time,combustion temperature,the volume of the absorption liquid,sample weight,and the flow rate of oxygen and argon were optimized.In the range of(0.10-2.50)mg·L-1 and(0.02-0.50)mg·L-1,the linear correlation coefficient(r2)of chlorine and bromine was greater than 0.999.The limits of quantitation of this method for chlorine and bromine was 0.55 mg·kg-1 and 2.60 mg·kg-1,respectively.Chlorine and bromine in epoxy resins and EC680k low-density polyethylene certified reference materials were determined by the established method,and the results were compared with the traditional oxygen bomb combustion-ion chromatography.The results showed that the relative standard deviations of chlorine and bromine in epoxy resins were 1.28％ and 2.29％,respectively,which were consistent with the results of oxygen bomb combustion-ion chromatography,the determination results of EC680k wee in accordance with the certified value,which proves that the method has good accuracy and precision.The method has high accuracy,sensitivity and repeatability,and can meet the requirements of screening chlorine and bromine content in batch samples and quality control of multi-batch products.
online combustion ion chromatographyepoxy resinschlorinebromine
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