离子色谱法测定高纯氯化锂中的五种微量阴离子

Ion-chromatographic Determination of High Purity Lithium Chloride for Microamounts Five Trace Anions

研究了氧化银沉淀法排除Cl^-的干扰，离子色谱法测定氯化锂中NO3^-、SO4^2-、F^-、NO2^-、PO4^：一的方法。采用美国Dionex公司产Ics—90型离子色谱仪，分离柱为IonPacASl4阴离子分离柱，以3．5×10^-3mol／LNa2CO3和1．0×10^-3mol／LNaHCO3作为淋洗液，流速为1．2mL／min，测定了氯化锂中杂质阴离子的含量。相对标准偏差（RSD）为0．2440％-1．3253％，样品回收率为94．56％～103．05％。该方法简便、快速、准确可靠。

To eliminate interference of Cl^- by silver oxide precipitation method and determine NO^3-, SO4^2 -, F-, NO2 , PO3 - in lithium chloride by chromatography of ions were studied. The content of anions in lithium chloride was determined by the ICS -90 ion chromatograph with IonPac AS14 anions separation column using a mixed solution of 3.5 × 10^ -3mol/L Na2CO3 and 1.0 × 10 ^-3 mol/L NaHCO3 as flow - phase system. The sampling was performed at a flow rate of 1.2mL/min. The method was proved to be accurate, convenient and rapid. RSD obtained were in the range of 0.2440% and 1. 3253% and the recoveries were in the range of 94.56% and 103.05%.