Sequential extraction experiments were used to study the chemical mobility of fluorine in rocks.

By studying the relation of selenium between the rock and stone coal with their weathering rock and original soil of early Paleozoic Period in Daba Mountain and combining the dripping and leaching experiment, the chemical mobility of selenium in the rock and stone coal of early Paleozoic in Daba Mountain was investigated.

In order to study the geochemical behavior about toxic trace elements of Yunfu pyrite in utilization process and evaluate their effects scientifically on environmental quality, the sequential extraction procedure is used to analyze the speciation distribution and chemical mobility of eleven toxic elements (Co, Ni, Cu, Zn, As, Se, Cd, Sn, Sb, Pb and Tl) in Yunfu pyrite and its industrial slag.

After the further analysis on the characteristics of carbonbased reducer used in the production of yellow phosphorus,it is pointed out that the reason for the lower yellow phosphorus production rate is poor chemical activity of anthracite,and so.

According to the tests for the stability of some mineral fiber dusts in inorganic acid and chemical activity of acid_etched residue, the authors discuss the acid etching process of mineral fiber dusts, especially the changes in surface active groups in the acid etching process, and the factors that affect acid_resistance and chemical activity of mineral fiber dusts.

And this paper discussed molecular features of humic acid,chemical activity and modifications of humic acid,absorption properties,peptization and gelation,introduced chief uses of humic acid.