光谱学与光谱分析, 2013, 33 (9): 2570, 网络出版: 2013-09-30  

液相隔膜辉光放电发射光谱法检测水中钾和钠离子

Determination of Aqueous Potassium and Sodium Ions with Liquid-Phase Diaphragm Glow Discharge-Atomic Emission Spectrometry
作者单位
1 大连海事大学环境科学与工程学院, 辽宁 大连116026
2 厦门理工学院水资源环境研究所, 福建 厦门361024
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850 V, 添加0.6%~0.8%甲醇时钾和钠的检出限分别为0.007和0.001 mg·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。
Abstract
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 0.007 and 0.001 mg·L-1 under the applied voltage of 850 V and addition of 0.6%~0.8% methanol, respectively. It was demonstrated that the LDGD-AES 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.

刘永军, 王蕾. 液相隔膜辉光放电发射光谱法检测水中钾和钠离子[J]. 光谱学与光谱分析, 2013, 33(9): 2570. LIU Yong-jun, WANG Lei. Determination of Aqueous Potassium and Sodium Ions with Liquid-Phase Diaphragm Glow Discharge-Atomic Emission Spectrometry[J]. Spectroscopy and Spectral Analysis, 2013, 33(9): 2570.

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