稀有气体同位素样品取样及分析方法改进

根据渗透性、释气性、密封性特征,不锈钢、紫铜适合作为气体、水稀有气体同位素样品取样容器材料,尽量避免使用工艺玻璃容器,特别是不能使用石英玻璃容器。重晶石、黄铜矿、黄铁矿等硫酸盐和硫化物是良好的研究单矿物包裹体稀有气体同位素组成特征的实验对象,也可以根据矿床类型选择适当的单矿物,粒度一般为20~40目,质量2 g左右。铜管冷焊法是水样品取样一种比较可靠的新方法,其特点是具有极低的漏率。取样体积一般为50 mL,可以实现稀有气体同位素组成与含量的测定,为水中溶解性稀有气体同位素示踪提供了有力支撑。水中气泡气体取样采用正压吹扫法收集气体,该方法操作方便,易收集气体,一个大气压条件下,取样体积为50 mL。不锈钢管、紫铜管等金属材料的使用,可保证样品在相对较长时间保存过程中避免大气的污染。简述了包裹体、水、气体三类样品稀有气体同位素组成分析主要原理和流程。

Improvement on sampling and testing method for noble gas isotope sample

According to the characteristics of permeability,gas release and sealing,stainless steel and red copper are suitable for sampling container materials of gas,noble gas isotope samples and water,while craft glass containers,especially quartz glass containers,should be avoided as far as possible.Barite,chalcopyrite,pyrite and other sulfates and sulfides are good experimental objects to study the characteristics of noble gas isotopic composition of single mineral inclusions.Appropriate single minerals can also be selected according to the type of deposit.The grain size is generally 20~40 mesh and the mass is about 2 g.The cold welding method of copper tube is a new and reliable method for sampling water samples,which has a very low leakage rate.The sample volume is generally 50 mL,which can be used to determine the isotopic composition and content of noble gases,providing a strong support for isotope tracing of dissolved noble gases in water.The positive pressure purge method is used to collect the bubble gas in water.The method is easy to operate and easy to collect gas.Under one atmospheric pressure,the sampling volume is 50 mL.The use of stainless steel tube,copper tube and other metal materials can ensure that the sample can be stored for a relatively long time to avoid atmospheric pollution.The main principle and process of noble gas isotopic composition analysis of mineral inclusion,water and gas samples were briefly described.