As a most common algal toxin in eutrophic freshwater body, microcystins can be produced by the bloom-forming Cyanophyta microcystis, it has become a potential hazardous substance in aquatic environments for its toxic, distribution and stability. With the increasing recognition of microcystins, China had added microcystin-LR into the related water quality standards. It is very important to detect and control the microcystins in the aquatic environment. This paper systematically introduced the current situation of researches about the determination and pollution control technique of microcystins in drinking water at home and abroad in resent years and then some issues worth of paying more attention to and doing further study in pollution control in future were presented.

With the aggravation of enviromental pollution, a quickly, sensitive, inexpensive monitoring means should be developed to protect water resources. Luminescent bacteria as biosensor have the advantages mentioned above. During past two decades, luminescent bacteria toxicity test was used widely in comprehensive toxicity evaluation, screening, monitoring and specific pollutants detection in water, the recent progress in this field was reviewed in this paper.

The character of exposure-response relationship between particulate matter and population mortality has been one of the critical and difficult problems in air pollution epidemiological study. The character of exposure-response relationship included the shape of the exposure-response relationship and the existence of the threshold concentration. In this paper, the recent relevant researches on the character of exposure-response relationship between particulate matter and population mortality were reviewed. The threshold concentration of particulate matter for mortality was not found and the shape of the exposure-response curve need to be further studied. Now, in China, we are facing a good opportunity for researching the exposure-response relationship between particulate matter and population mortality.

About half of the world population and more than 90% of rural households in the developing countries still use unprocessed biomass fuels (wood, dung and crop residues) as the fuels. These substances, burning in the open fire or in the simple stoves, can cause indoor air pollution and the pollutants exposure in women and children is more serious. Biomass smoke contains lots of toxic and harmful substances which may impact the health of human. This article presented a recent research progress in the indoor air pollution and health effects caused by combustion of biomass fuels in China and in the world.

Objective To establish a method for determination of aluminum in water by graphite furnace atomic absorption spectrometry (GFAAS). Methods Aluminum in water was directly determined by GFAAS at wavelength of 394.4 nm without any matrix modifiers. Results A good linearity (r=0.999 5) was obtained, the linear range was 0-0.600 mg/L. RSD of samples ranged from 2.1% to 6.4%, the average rates of recovery were between 91.0%-108.0%. The detection limit of the method was 0.6 ?g/L, the quantitative limit was 1.9 ?g/L. There was no significant difference between the results determined at wavelength of 394.4 nm and 309.3 nm. Conclusion This method is simple, rapid, accurate and has a wide linear range. It can be applied in the determination of aluminum in drinking water.

Objective To understand the testing capability for organochlorine pesticides of the food inspection labs in China. Methods The CNCA organized the proficiency testing(PT) of determination of heptachlor, aldrin and dieldrin in the vegetable oils. 21 labs from 14 provinces (cities) took part in the PT. The GC method prescribed by official method of AOAC was recommended, other method was also permitted. Results The PT showed that 81.0%-85.7% labs presented satisfactory results, 9.5% had questionable results and 4.8%-9.5% had dissatisfactory results. Conclusion Most of the labs that took part in the PT have good competence in analyzing organochlorine pesticides.

Objective To develop a method to determine the content of ketoconazole in the disinfectant by HPLC. Methods The separation was carried out on an ODS C18 column. Methanol-water (80+20) was used as the mobile phases. The flow rate was 1.00 ml/min, the detection wavelength was 239 nm. Results The linearity was obtained in the range of 1.00-100 ?g/ml for ketoconazole, the average recovery rates were 98.1%-99.8%. The difference in a day and in another day was less than 2%. The detection limit was 1.08 ?g/ml. Conclusion This method is simple, accurate, rapid and can be used as a quantitative analysis method for ketoconazole.

0.999) and the limits of detection were 0.03-0.6 ng/ml. The average recoveries were 85.5%-113.1%, RSDs were 1.8%-4.6%. Conclusion With the accuracy, high sensitivity and reproducibility, the method is suitable for the determination of organochlorine pesticide residues in the honey.

Objective To investigate the drinking water quality in the rural areas in Chengjing and to provide the scientific data for making the plan of drinking water safety. Methods 40 villages and the county seat were investigated, 1 water source was randomly selected by proportional stratified sampling from each village for survey. Results 96.08% of the rural population drank the water from the centralized water supply system. As for the centralized water supply,11.06% of the rural population drank the completely treated water,73.21% drank the disinfected water,11.80% drank the raw water without any treatment. 3.92% of the rural population drank the water from the decentralized water supply system. 91.92% of the rural population drank the ground water and 4.16% drank the surface water. Only 4 in the 42 water samples were up to grade Ⅰ～Ⅲ standard. 11.43% for ground water and 0% for surface water were eligible. The eligible rate of bacterial indexes was 5.88% for water samples collected from the centralized water supply system and 25.00% for decentralized water supply system. In the present investigation,20 water quality parameters were tested and the bacteriological indexes in all of the unqualified water samples greatly exceeded the limits. Conclusion The microbial pollution of drinking water is serious in the investigated areas in Chengjiang. It is urgent to make the efficient measures to protect the water source.

0.05). Conclusion High fluoride may cause children intelligence decrease.