大量Li+存在对Mg2+分析测定的影响研究

Study on the Interference of Coexisting Lithium Ion on the Measurement of Magnesium Ion

中文关键词:  盐湖卤水体系  锂  镁  正丁醇  乙醇

英文关键词:Salt-lake brine,Lithium,Magnesium,n-Butanol,Ethanol

中文摘要:

      在含锂盐湖卤水体系中，大量Li^＋的存在，对络合滴定法测定Mg^2＋易产生较大的干扰，使分析结果偏高。根据盐湖卤水体系中锂盐的含量，通过调整正丁醇和无水乙醇混合液的加入量可很好地抑制Li^＋的干扰，从而保证Mg^2＋分析结果的相对误差不超过0．3％。

英文摘要:

      It is well known that the presence of lithium in brine samples would lead to significant errors in magnesium measurements by titration methods.The present work deals with the elimination such interference caused by lithium.It was observed that the interference strengthens as lithium concentration of lithium-to-magnesium ratio increases.Moreover,the volume of the n-butanol-ethanol mixture needed is proportional to the mass of lithium in the samples.By adding different amounts of the alcohol mixture to samples,the analytical error could be within 0.3%.