Abstract：The determination of chlorine in matrix reference material is difficult. The content of chlorine in reference material of bovine liver was determined by ion chromatography combined with pyrohydrolysis and potentiometric titration following dry ashing digestion. The pretreatment and determination conditions of the two methods were optimized, the experimental results show that the results of the two methods are consistent,the relative standard deviations of the measurement results are 0.7% and 1.1% respectively. The two methods were verified by using NIST bovine liver reference material (SRM1577c), the results of the two methods are consistent with the standard values. The uncertainties of the determination results of the two methods were evaluated, and the relative expanded uncertainties of the chlorine determination results (k=2) are 1.6% and 2.2% respectively. Both methods used to determine the chlorine content in bovine liver are accurate and reliable, and can meet the requirements of reference material certification.
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2019, Vol. 40 
