中文摘要：

研究了液相隔膜辉光放电发射光谱法对水中钾离子和钠离子的检测性能,考察了外加电压和有机添加剂甲醇对检测灵敏度和检出限的影响。结果表明提高外加电压和添加甲醇能提高检测灵敏度和降低检出限。在电压850V,添加0.6%～0.8%甲醇时钾和钠的检出限分别为0.007和0.001mg·L^-1。液相隔膜辉光放电发射光谱法检测水中金属离子具有背景光谱干扰小和灵敏度高的特点。

英文摘要：

The present paper described the determination of potassium and sodium ions with a liquid-phase diaphragm glow discharge emission spectroscopy（LDGD-AES）in aqueous solution.The discharge was formed in a pin hole on a dielectric diaphragm interposed between two submerged graphite electrodes.Effects of applied voltage and the addition of organic additive methanol on the determination were examined.It was found that increasing the applied voltage and adding of methanol can increase the detection sensitivity and decrease the detection limit.Limits of detection for K and Na were 0.007and 0.001mg·L^-1 under the applied voltage of 850Vand addition of 0.6%～0.8% methanol,respectively.It was demonstrated that the LDGDAES is a promising technique in measurements of metal ions in aqueous solution,because no optical interferences from the electrodes and the background molecular bands from air were found.