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本文介绍了低压离子色谱仪测定水样(井水、湖水、矿泉水、自来水)和酸雨中锂、钠、铵、钙、钾和镁离子的方法、欲测阳离子在阳离子交换柱上被分离,分别用1.4mmol·1~(-1)HNO_3和0.6mmol·1~(-1)乙二胺+1.2mmol·1~(-1)HNO_3溶液作流动相,流速为1.6ml·min~(-1).各离子的流分用电导检测.进样量为10μl时,Li~+,Na~+,NH_4~+,K~+,Ca~(2+)和Mg~(2+)离子的检出限(2倍噪音比),分别为0.020,0.050,0.100,0.250,2.5和1.0μg·ml~(-1).
In this paper, a method for the determination of lithium, sodium, ammonium, calcium, potassium and magnesium in water samples (well water, lake water, mineral water and tap water) and acid rain by low pressure ion chromatography is introduced. The cation to be measured is separated on a cation exchange column, The mobile phase consisted of 1.4 mmol · 1 -1 HNO_3 and 0.6 mmol · -1 -1 ethylenediamine + 1.2 mmol · 1 -1 HNO_3 solution, the flow rate was 1.6 ml · min ~ (-1) 1) .Individual fractions were detected by conductance.When the sample volume was 10μl, the contents of Li ~ +, Na ~ +, NH_4 ~ +, K ~ +, Ca ~ (2+) and Mg ~ (2+) The detection limit (2 times noise ratio) were 0.020, 0.050, 0.100, 0.250, 2.5 and 1.0 μg · ml -1, respectively.