年轻地下水测年最新技术——SF_6法  

A new method in dating young groudwater : SF_6 method

作　　者：李晶晶[1] 周爱国[1] 刘存富[1] 蔡鹤生[1] 张俊刚[1] 毛绪美[1] 

机构地区：[1]中国地质大学环境学院,武汉430074

出　　处：《水文地质工程地质》2005年第1期94-97,120,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金(40372112)

摘　　要：SF6是一种无色、无嗅、无毒、不易燃的惰性气体,具有良好的绝缘性、灭弧性和散热性,广泛用于断路器和变压器的绝缘材料。电器设备的泄漏使得大气中SF6浓度增加很快,每年达7%,造成SF6的人工来源,此外还有天然来源。SF6通常用带电子捕获器(ECD)的气相色谱仪测定。SF6是一种新型的测定年轻地下水年龄的工具,特别适合研究1990年以后补给水的年龄。SF6年龄以亨利定律为基础计算。由于大气中SF6浓度逐年增加,比CFC测年法具有更大的优越性。SF_6 is a colorless,odorless,nonflammable,stable gas with excellent electrical insulating,arc-quenching and radiating properties.It is widely used as an electrical insulator in high-voltage switches and transformers.The revealment of electrical appliance cause concentration of SF_6 in air increased rapidly (about 7% per year),which induce anthropogenic SF_6. In addition natural source of SF_6 is also exist.Usually we measure SF_6 with gas chromatography and electron capture detector (ECD).SF_6 is a new tool of dating young groundwater,it is particularly useful in dating very young (post-1993) groundwater.Calculating of age is based on Henry's Law.Comparing with CFC method,SF_6 method has advantages owing to its high rate of increase in the atmosphere.

关 键 词：SF6 年轻地下水年龄 气相色谱仪(ECD) 

分 类 号：P641.3[天文地球—地质矿产勘探]