用中子活化法研究镜泊湖水体中多种微量元素的含量及分布特征

未受明显污染的天然水中多数微量元素的含量一般在ppt至ppb级。中子活化分析法具有很高的灵敏度和足够的准确度,可以成功地用于测定天然水中的多种低浓度微量元素,在地球化学和环境科学研究中是一种有力的分析工具。本工作采用两种预浓集方法配合中子活化和γ谱仪测量,研究了牡丹江上游镜泊湖水中23种微量元素的含量及分布。牡丹江为松花江的主要支流之一,其上游的镜泊湖地区工业很少,湖水中微量元素的含量受人类生产活动

The distribution and background values of trace elements in Jingpo lake water

The NAA was applied to the multielemental analysis of the lake water taken from the upper, middle and lower reaches of the Jingpo lake. The distribution and the background values of 23 elements(As, Zn, Cr, Fe, Co, Sr, Ba, Rb, Cs, U, Th, Sb, Sc, Se, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu and Au) in lake water were studied. The element contents of various sampling sites indicated that along the horizontal direction the element contents had no significant variation, but in the verticle direction, the content of Fe is increased with increasing depth. The analytical results were compared with the mean values of element contents given in the reference . It is shown that the water in Jingpo lake is out of artificial pollution,but the element contents were strongly influenced by the surrounding natural environment. Therefore the element contents should represent the na-tural background values of trace elements.