[Sequential extraction experiments applied to study chemical mobility of fluorine in rocks].

Sequential extraction experiments were used to study the chemical mobility of fluorine in rocks. The results show that there are quite big differences in chemical mobility of fluorine in rocks of different types. Fluorine in carbonate rock is very active, in which the proportion of leachable fluorine is generally more than 75%.

Mercury in the topsoil and dust of Beijing City.

Research on mercury concentration in the dust and topsoil of Beijing City reveals the following conclusions: mercury concentration in Beijing topsoil and dust is middle compared to other mercury concentration studies and varies greatly in different sampling spots. Mercury concentration in the topsoil is between 0.019mg.

In vitro effects of metal ions on lipid peroxidation induced by alcohol in mice liver homogenate.

The study is aimed to estimate the effect of different heavy metals such as Hg2+, Cd2+, Mn2+, Cr3+, Ni2+, Se2O3(2-), As2O3 water solution and combined effects of Hg2+, Mn2+, Cr3+ on lipid peroxidation in mice liver homogenate in vitro. Lipid peroxidation was determined as thiobarbituric acid-reacting materials (TBA). We select five different concentrations of selected ions for experiments.

Developing environmental health indicators as policy tools for endemic fluorosis management in the People's Republic of China.

Drinking groundwater containing naturally occurring elevated concentrations of fluoride has given rise to extensive dental and skeletal fluorosis affecting many millions of people in China. This paper describes three sets of indicators useful for environmental and human fluorosis management purposes, namely, descriptive indicators (the past), response indicators (the present) and performance indicators (the future). Each of the sets of indicators was further detailed following the Organisation for Economic Co-operation and Development (OECD) pressure-state-response model modified to include an impact parameter.

[Towards <>: idea, principle and methodology of design and research results].

<>is the first atlas with spatial analysis methods to study on plague distributions, epidemics, controls, foci characters and their relationships with environment in China. This paper briefly introduces the idea, principle and methodology of its design and the main research results from it. The atlas include ten map groups as general maps, environmental background maps, plague epidemic and foci background maps in the world, maps of plague foci and their environments, epidemic maps, distribution maps of reservoirs, distribution maps of vectors, biotype distribution maps of yersinia pestis, maps of control institutions and control result maps.

Selenium in soil and endemic diseases in China.

Selenium is an essential element for humans, animals and some species of microorganisms. The biological function of selenium shows dual characteristics. The selenium content range between toxic and deficient concentration is very narrow.