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建立了湿法碱消解-盐酸提取-淋洗液在线发生离子色谱法测定锂云母中氟量的方法。通过实验确定了盐酸用量、淋洗液浓度和淋洗液流速。方法检出限为0.011 mg/L,线性相关系数r大于0.999 9。对实际锂云母样品进行重复5次测定,并做了加标回收实验,相对标准偏差RSD为0.34%,加标回收率为98.8%~103.1%。经国家标准品验证,测定值与标准值相符。该方法快速准确,能达到测定锂云母中氟量的分析要求。
A method was established for the determination of fluorine in lepidolite by ion chromatography of wet alkaline digestion - hydrochloric acid extraction - eluent. The amount of hydrochloric acid, eluent concentration and eluent flow rate were determined experimentally. The detection limit was 0.011 mg / L, and the linear correlation coefficient r was greater than 0.999 9. The actual lithium mica samples were measured five times in a repetitive manner, and the spiked recovery experiments were done. The relative standard deviations (RSDs) were 0.34% and the spiked recoveries were 98.8% ~ 103.1%. The national standard verification, the measured value is consistent with the standard value. The method is fast and accurate, and can meet the analytical requirements for the determination of fluorine in lithium mica.