石灰石中二氧化碳的含量,是评价石灰石中碳酸盐含量的重要指标。目前测定石灰石中二氧化碳含量多采用烧碱石棉吸收重量法,但此法过程繁杂费时,常因操作不当带来结果误差。笔者根据石灰石中碳酸盐在825℃下分解放出二氧化碳的特性,采用碳氢氮元素分析仪定量碳酸盐中的碳,从而求出二氧化碳含量。此法操作简单,节约试剂,从进样到结果仅需5分钟时间,且准确,重现性好。 The content of carbon dioxide in limestone is an important indicator to evaluate the carbonate content in limestone. At present, the determination of the content of carbon dioxide in limestone uses asbestos absorption gravimetric method, but this method is complicated and time-consuming, often resulting in incorrect results due to improper operation. According to the characteristics of carbon dioxide released from carbonate in limestone at 825 ℃, the author uses carbon-nitrogen nitrogen analyzer to quantify the carbon in carbonates to find the content of carbon dioxide. This method is simple, saving reagents, from injection to the results only 5 minutes, and accurate, reproducible.