【摘要】 硝酸铵具有遇热、受撞击易发生爆炸的危险特性，如发生安全事故，社会危害极大，严格监测硝酸铵中可燃物的含量是安全管理的核心环节。可燃物的含量采用行业标准《硝酸铵溶液》(HG/T 4523—2024)中的方法测定，不仅耗时长，而且测定结果的重复性欠佳；采用国家标准《硝酸铵类物质危险特性分类方法》(GB/T 29879—2013)中的方法测定，其结果严重不符合实际情况；采用改进后的GB/T 29879—2013中的方法测定，虽然结果满足标准要求，但耗时仍为4～5 h。采用总有机碳分析仪法测定硝酸铵中可燃物含量，总碳质量浓度在25 mg/L(可燃物质量分数为0.2%)以内时，碳的质量与对应的峰面积呈线性关系，测定结果的相对标准偏差为5.89%～8.04%,加标回收率为98.4%～100.5%,样品测定时间为25 min,完全满足分析要求。更多还原

【Abstract】 Ammonium nitrate is characterized by the hazardous property of being prone to explosion when exposed to heat or impact, and the social harm caused by such safety incidents is extremely severe. Therefore, strict monitoring of the content of combustible substances in ammonium nitrate is a critical component in safety management. The method specified in the industry standard "Ammonium Nitrate Solution"(HG/T 4523—2024) for determining combustible substance content is not only time-consuming, but also exhibits poor repeatability in results. When the method specified in the national standard "Classification Method for the Hazardous Characteristics of Ammonium Nitrate Substances"(GB/T 29879—2013) is adopted, the obtained results seriously deviate from the actual situation. After the method in GB/T 29879—2013 is improved, although the determination results meet the standard requirements, the analysis time remained 4-5 hours. By using the total organic carbon analyzer method for the determination of combustible substance content in ammonium nitrate, when the total carbon mass concentration is within 25 mg/L(corresponding to a combustible substance mass fraction of 0.2%), a linear relationship exists between carbon mass and the corresponding peak area. The relative standard deviation of the determination results ranges from 5.89% to 8.04%, and the spiked recovery ranges from 98.4% to 100.5%. The analysis time for each sample is 25 minutes, which all fully meets the analysis requirements.更多还原