全自动总氮在线分析仪的研制

摘要

The instrument combined the on-line heating digestion, the on-line cooling, the on-line cadmium column reduction, azo colorimetry and ultimately the use of flow injection analysis techniques to achieve the automatic on-line monitoring of total nitrogen.The system can automatically implement the entire process from an environmental sampling,pretreatment, measurement, data analysis to the final transmission without intervention.The method was proven to be less reagent, width linear range (0-100mg/L), the lower quantification limit (0.042mg/L), the recovery rate is within 93.3％-103.0％, and apt to on-line determinate instantly with rapid sampling frequency (3 h-1) and the higher precision (RSD＜0.43).%将在线加热消解、在线冷却、镉柱还原与偶氮比色法相结合,并采用流动注射分析技术实现了全自动总氮分析仪的研制工作.该系统可在无人干预的情况下,自动地执行从环境采样、预处理、测定、数据分析和最终传输的全过程.实验证明,此系统消耗试剂量少,测定范围宽(0~100mg/L),检出限低(0.042mg/L),测定快速(3样/时),精密度高(RSD<0.43%),实际水样的加标回收率均在93.3%~103.0%之内,可用于在线快速测定总氮.