Simultaneous Determination of Nine Cations in Brines by Ion Chromatography
A method for simultaneous determination of Li+,Na+,K+,NH4+,Rb+,Cs+,Mg2+,Ca2+,Sr2+in brines by ion chromatography was established.Metrosep C6-150 cation chromatographic column was used which was eluted by 4 mmol·L-1 HNO3.With the flow rate of 0.9 mL·min-1,and the column temperature of 45 ℃.The mass concentration of nine cations had a good linear relationship with the chromatographic peak area in the range of 0.10-100.00 mg·L-1,the correlation coefficients were all more than 0.999 9.The detec-tion limits of the method were 0.002-0.087 mg·L-1,and the quantitation limits were 0.006-0.292 mg·L-1.The relative standard deviations of determination results were 0.20％-1.94％(n=10),and the recoveries of the standard addition were 98.05％-102.89％.The method has a simple sample pretreatment procedure and simple and a wide linear range,which is suitable for rapid determination of cations in brines.
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维普
