摘要
利用１８－冠６醚与Ｋ~＋，Ｎａ~＋，Ｃａ~２＋，Ｍｇ~２＋，ＮＨ_４~＋离子络合常数的不同，在等速电泳分离体系前导电解质溶液中加入适量１８－冠６醚，改变各离子的有效淌度，实现了上述离子的一次性分离和同时检测。将此法应用于分析气溶胶、实际水样、矿样，测定结果与标准值基本一致。
K^+, Na^+, Ca^2+, Mg^2+ and NH^4_+ were simulataneously determined by capillary isotachophoresis. The 18-crown-6 ether of 30mmol/L as complexant was added into the leading electrolyte to change the effective mobility of these ions for their separation in the capillary. The separation and determination conditions were optimized. The method has been used in the analysis of aerated solids, water samples and standard silicate mineral samples with satisfaction. The results obstained agreed well with standard val ues. The detection limits were 1.02, 1.2, 0.72, 1.38 and 2.34 ng for NH^+_4,Ca^2+,Mg^2+,Na^+ and K^+, respectively. The standard deviation was 0.026 ~ 0.034 and the coefficient of variation was 0.76% ~ 1.2%.
出处
《分析仪器》
CAS
1999年第2期47-50,共4页
Analytical Instrumentation
基金
国家自然科学基金
固体表面物理化学国家重点实验室资助项目
