用中子活化法测定克里雅河流域地表水体的地球化学背景值

Assaying the Geochemistry Background Value of Surface Water in Keriya River Basin by Neutron Activation Method

用中子活化法测定地表水体中的地球化学背景值是一项新的分析技术。该方法在我国七十年代初已广泛被应用。作者曾于1988年9月参加塔克拉玛干沙漠科学考察时采集和收集没有被污染的水样,主要取自克里雅河流域内的不同海拔高程的河流和湖泊中的地表水。这些水样经处理,在常温下蒸发以后,取其残留物用中子活化法进行照射,分析了7个水样从中得出30种化学背景值。分析结果表明,该流域内的各种水体地表水的地球化学背景值与干旱区的气候、生物条件及岩石的地球化学成分有密切关系。

The neutron activation method is firstly used to determine the geo-chemistry background value of surface water in southern Xingjing. Seven water samples are collected from Keriya River,of which,thirty element contents are determined. The results show that:1. The geo-chemistry background value of surface water in arid area is greater than that in tropical and subtropical area of southern China,the former is normally n. 0. 001-n. 10~7p. p. b,the later n. 0. 0001-n. 10~5p. p. b2. The geo-chemistry element contents of surface water in arid area result from geo-endogenic force and geoexogenic force. The later plays an important role in the Keriya River.3. The geo-chemistry backgroud value of water in lake is greater than that in river.In conclusion,the geo-chemistry background values of surface water in arid area have deep relationship with regional climate,hydrology and geo-chemistry composition of rocks.