基于氧弹燃烧-离子色谱法测定生活垃圾可燃组分中氯和硫的含量

采用氧弹燃烧法对垃圾样品干燥基进行前处理,用碳酸钠(24 mmol/L)和碳酸氢钠(30 mmol/L)以及过氧化氢(2.5%)为吸收液,并用离子色谱法对其处理后吸收液中氯离子和硫酸根含量进行测定,最后换算为样品中氯和硫的含量。氯和硫酸根质量浓度分别在1~50 mg/L与色谱峰面积呈良好的线性相关,其线性相关系数都大于0.999。样品中氯的加标回收率为96.5%~99.1%,硫酸根的加标回收率为92.5%~101%,测定结果中样品的相对平均标准偏差均小于3%(n=5),并用质控样品对方法进行了验证,结果表明样品的前处理方法简单、样品损失少、准确度高,适合于垃圾样品可燃组分中氯和硫含量的测定。

Determination of Cl and S in Dry Basis Waste by Means of Oxygen Bomb Combustion and Ion Chromatography

The dry base of waste samples was pretreated by oxygen bomb combustion method,and 24 mmol/L Na 2CO 3,30 mmol/LNaHCO 3 and 2.5%H 2O 2 were used as absorbents,the contents of chlorine and sulfate in the absorbent solution were determined by ion chromatography.At last,the content of chlorine and sulfur in the sample was converted.The mass concentration of chlorine and sulfate showed good linear relationship with ion chromatographic peak area in the range of 1-50 mg/L,both coefficients were greater than 0.999.The recovery of chlorine in the sample was 96.5%-99.1%and sulfate was 92.5%-101%,the determination results of sample average relative standard deviation was less than 3%(n=5).This method was also verified by the quality control samples,the results show that the method of sample preparation is simple,less sample loss,high accuracy,suitable for the determination of inorganic elements content in waste sample.