A GEOCHEMICAL SURVEY OF TOPSOIL IN THE CITY OF OSLO, NORWAY

摘要

The city of Oslo is situated centrally in the Oslo-graben, which is a Permian rift basin consisting of different kinds of volcanic and sedimentary rocks. In the summer of 1998, approx- imately 300 samples of surface soil (2-3 cm) were taken systematically, 1 km~(-2). The investigated area covers about 500 km~2. Samples were dissolved in 7 M HNO_3 and analysed for 29 elements with ICP-AES, mercury with cold-vapour technique (CV-AAS) and arsenic and cadmium with a graphite furnace (GF-AAS). A factor analysis is frequently used to identify relationships among sets of interrelated variables.