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Project title:The Environmental Geochemical Monitoring Networks (EGMON) project

Project Leader: Prof. Xie Xuejing

Conducted by: Institute of Geophysical and Geochemical Exploration

Implementation Duration Years: 1993-1996

The EGMON project in China was conducted from 1992 to 1997 with Professor Xie Xuejing as project leader. This project was part of the IGCP 259/360 (International Geochemical Mapping/Global Geochemical Baselines) pilot study of floodplain sediment as a suitable sampling medium for global-scale geochemical mapping, using a grid cell of 160×160 km2. A total of 530 sites were collected in eastern China and part of western China, covering approx. 6 million km2. The sampling sites were generally located on large-catchment basins ranging from 1000 to 10000 km2 , mostly from 3000-5000km2. Two samples were taken at each sites: (i) a surface sample from a depth of 5-25 cm, and (ii) a deep sample from a depth of 80-120 cm. (Xie et al., 1997).  Each sample was ground to <74 μm. Total concentrations of 50 elements were determined at the central laboratory of the Institute of Geophysical and Geochemical Exploration.This provides online sharing of all elements except U, Th, and heavy metals.