作为湖泊水中微量硝酸根的分析法,本文研究了用离子交换树脂浓缩和紫外吸光法构成的液相色谱法的最佳条件。其结果是:该法精度在用5m150ppb硝志氮溶液行20次重复测定时的标准偏差为0.86％,另外在S/N= 3时的检测极限是0.014ppb。其含量在0～1 ppM和0～100ppb时所得到的检量线浓度和色谱峰高的相关系数为0.999;含量在0～loppbg时,其相关系数为0 .993,因此,不受干扰物质的影响。该法硝志氮的定量下限为1 ppb,测定所花的时间不到10分钟。现以测定日本琵琶湖水中的硝酸根为例,发现该法所测得的数据与铜、镉 As an analytical method of trace nitrate in lake water, the best condition of liquid chromatography with ion exchange resin concentration and ultraviolet absorption was studied in this paper. As a result, the standard deviation was 0.86% when the accuracy of the method was measured 20 times in 5 ml of 150 ppb nitazonium solution, and the detection limit was 0.014 ppb at S / N = 3. The correlation coefficients between calibration curve concentration and chromatographic peak height at 0 ~ 1 ppM and 0 ~ 100 ppb were 0.999. When the content was 0 ~ loppbg, the correlation coefficient was 0.993. Therefore, the undisturbed substance Impact. The method nitrate nitrogen quantification limit of 1 ppb, determination of the time spent less than 10 minutes. Now to determine the Japanese Lake Biwatera nitrate, for example, found that the method measured data and copper, cadmium