阳离子静态交换—离子色谱法同时测定地质试样中微量氯、溴及硫

Simultaneous Determination of Micro Amounts of Chlorine,Bromine and Sulfur in Geological Materials by Static Cation Exchange Separation-ionic Chromatography

地质样品中不但成分复杂,而且氯、溴及硫的含量相差悬殊,难于在一次取样中同时测定。所见报道的有热解氧化吸收法用于测定金属或岩石样品中氟、硫及氯;另一种是熔融后动态离子交换法,用于测定废水沉积物中氟、氯、磷及硫离子。上述两种分离及前处理方法,其回收率约为82—84%左右。

A method for the simultaneous determination of micro amounts of chlorine,bromine and sulfur in geological materials by static cation exchange separation ionic chromatography.is described.The sample is sintered with Na_(2)CO_(3)-ZnO,and cation exchange resin 732 is added into thel eached solution. The optimum condition was found to be l.5mmol L^(-1) NaOH- 1.7mmol L^(-1) Na_(2)CO_(3) as eluant of the anions. The detection limits of Cl^(-), Br^(-), and SO_(4)^(2-) are 7.5, 0.63 and 64μg/g, respectively;the RSD for samples containing 7.2μg/g of Cl^(-) 6μg/g of Br^(-), 346 μg/g of SO_(4)^(2-) were 4.5, 6.0 and 6.7%, respectively (n=12),and the recoveries are nearly quantitative.