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采用电感耦合等离子体原子发射光谱法测定循环冷却水系统污垢中铁、钙、镁元素的含量。选用5mL硝酸(1:1)与5mL盐酸10滴过氧化氢作为溶剂溶解样品,铁、钙、镁的分析谱线分别为259.94nm、317.93nm、279.08nm,各元素的工作曲线线性良好,线性相关系数均大于0.9999,测定结果的相对标准偏差分别为0.99%,0.38%,0.28%(n=6)。加标回收率在93.2%~97.1%之间。该方法的精密度、准确度均能满足环冷却水系统污垢中铁、钙、镁元素的含量分析规范要求。
Determination of Iron, Calcium and Magnesium in the Scale of Circulating Cooling Water System by Inductively Coupled Plasma Atomic Emission Spectrometry. The analytical solutions of iron, calcium and magnesium were 259.94nm, 317.93nm and 279.08nm, respectively. The work curves of each element were well linear and linear The correlation coefficients were all greater than 0.9999. The relative standard deviations of the determination results were 0.99%, 0.38% and 0.28%, respectively (n = 6). The spiked recoveries ranged from 93.2% to 97.1%. The precision and accuracy of this method can meet the requirements of content analysis of iron, calcium and magnesium in the fouling of ring cooling water system.