燃烧氧化偶联离子色谱法检测甲醇、碳黑中氯和硫

Combustion Oxidation Coupled to Ion Chromatography to Determine Chlorine and Sulfur Content in Methanol and Charcoal Using I^-/I_3^- Solution as the Absorbent

提出采用燃烧氧化偶联离子色谱法测定甲醇、碳黑中的氯和硫的含量。方法通过在管式炉中燃烧将甲醇、碳黑中的氯及硫转化为Cl2、HCl,SO2,SO3等气态物质。选用I-/I3-溶液作为燃烧产物的吸收剂。I-/I3-溶液既作氧化剂又作还原剂,将Cl2、HCl转化为Cl-,将SO2、SO3转化为SO42-。用离子色谱法测量吸收剂中Cl-和SO42-的含量进而推算甲醇、碳黑中氯和硫的含量。实验结果表明,该方法简单、准确、灵敏。氯和硫的检出限分别为9.71μg/g和1.64μg/g。

A new method has been developed to determine chlorine and sulfur content in methanol and charcoal by using combustion oxidation coupled to ion chromatography. Through combustion oxidation, the chlorine and sulfur in methand or charcoal was converted to chlorine and chlorine hydride, and sulfur dioxide respectively. Using I^-/I3^- solution as the absorbent, they were converted to chloride and sulfate ions, respectively. These ions were then determined directly by ion chromatography. The difference between the developed method and the others is that this method use cheap and convenient porcelain boat and the tubal stove was used as a reactive device, and efficient and stable I^-/I3^- solution as the absorbent. The method is economic, simple, accurate and sensitive. The detection limit of the method is 9.71×10^-6 μ/g for Cl and 1.64×10^-6μg/g for S.