Soil geochemical baseline and environmental background values in northern Haihe plain, China

Based on the data obtained from the multipurpose regional geochemical survey(1∶250000) in the Beijing,Tianjin and Heibei Province, and the basic conception of geochemical baseline and environmental background values, the study area (Northern Haihe plain) was divided into three statistical units in light of the different depositional conditions. By using the method of standardization, that is, after repeatedly crossing out the surface soil anomalous data, geochemical baselines of various indicators were obtained through the correlation between other elements and inert element Ti, and after repeatedly crossing out the deep soil anomalous data, mean values, standard deviations and variation coefficients of 34 indicators were obtained, and thus characterized the background values. The above study may be cited as major scientific basis for regional soil environmental quality evaluation and monitoring.