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The article presents abstracts of several studies on environmental geochemistry. Some of the abstracts presented include "Biogeochemical Cycling of Nutrients in Karstic Catchments, Southwestern China: Linkages to Changes of Eco-Environments," by Congqiang Liu and "Emerging Organic Contamination in China," by Guibin Jiang and colleagues.

Four experiments have been done on the influence of times of infusion, temperature, time and ratio of tea to water on the dissolving characteristics of fluoride and aluminum in brick tea. According to the results, the behaviors of F and Al which found their way into tea liquor were analyzed and the conclusions have been drawn; the dissolution of F and Al is not synchronous and after the elements find their way into tea liquor respectively, they will be reset to form complexes of F and Al. [ABSTRACT FROM AUTHOR]

The Ceshui Formation coal is mostly anthracite and its metamorphism has been less documented. By analyzing systematically the reflectance of vitrinite and the results of X-ray diffraction of the Ceshui Formation coal in the Lianyuan coal basin, the spatial variation characteristics of coal ranks, coal metamorphic regions, the extension of coal metamorphic belts, coal metamorphic gradients, coal chemical structure and the effect on the degree of metamorphism of heat-production and storage conditions, buried depth of the Indosinian-Yenshanian granites at the margins of the Lianyuan coal basin are discussed. The research results in conjunction of the features of regional hydrothermal alterations, endogenetic deposits with the Ceshui Formation coal measures, and the development of secondary vesicles indicate that the telemagmatic metamorphism is the main factor leading to the metamorphism of the Ceshui Formation coal in the region studied. [ABSTRACT FROM AUTHOR]