流动注射-阳离子交换预富集-ICP-AES法在线分析磷矿中钙、镁、铝、铁的研究

Determination of Ca、Mg、Al、Fe in Phosphatic Rocks with On-line Flow Injection-Cation Exchange Preconcentration and ICP-AES

用 732型强酸性阳离子交换树脂分离富集 ,并与改进的流动注射 (双流路 )相结合 ,建立了新型、高效的流动注射 -阳离子交换预富集 - ICP- AES在线分析体系。研究了酸度、流速、淋洗剂浓度等的选择、共存离子的干扰情况并应用于矿样的分析。 Ca,Mg,Al,Fe各元素的检出限分别为 0 .9μg/ L,0 .6 μg/ L,5.5μg/ L,1 .4μg/ L;1 0次测量的相对标准偏差分别为 3.4 4% ,1 .53% ,1 .6 0 % ,2 .58%。回收率在 93.0 %～ 1 0 1 .4 %之间。分析速度可达每小时 4 0个样品。

In this paper,a new kind of flow injec\| tion system was presented for the determination of Ca、Mg、Al and Fe in phosphatic rock by cation exchange and ICP AES. The working parameters were discussed and optimized.The detection limits were 0.9 μg/L,0.6 μg/L,5.5 μg/L ,1.4 μg/L and RSD( n =10) were 3.44%, 1.53% ,1.60%,2.58% for Ca,Mg,Al and Fe respectively.The recoveries were 93.0%～101.4% and the determination rate of the samples is 40/h