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0.999. Conclusion The precision and accuration of this method can satisfy the determination of VOCs in indoor air, this method is simple, rapid and easy to be popularized also.
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Objective To explore the feasibility for applying passive individual samplers to determine NO2 and SO2 in the air simultaneously and to monitor the levels of them in the indoor and outdoor air. Methods Ten households were selected in urban and suburban area of Beijing respectively. Passive individual sampler made by Green blue Co. in Japan was used to sample and the ion chromatographic technique was used to determine the concentration of NO2 and SO2. Results There was no significant difference had been seen between the NO2 and SO2 level monitored by passive sampler and by the assay recommended by the national standard. It showed that the levels of NO2 and SO2 in ambient air were higher that that in indoor air, both indoor and outdoor air pollution in the urban area was more serious than that in the suburban area. The outdoor sulfur dioxide concentration in the urban area in winter was as 3.14 times high as that in the suburban area in 2001. The level of sulfur dioxide in the urban ambient air in 2002 was much lower than that in 2001. Conclusion Passive individual samplers with molecular diffusion will be suitable for environmental quantity monitoring.
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Objective To investigate the genetic damage of dust storm fine particles on human blood lymphocytes. Methods The chromosomal aberration test and cytochalasin B blocked test were used to investigate the effect in vitro of dust storm fine particles (PM2.5) (0, 33, 100, 300 ?g/ml)collected in Baotou and Wuwei cities on human lymphocytes. Results In both dust storm and normal ambient air fine particles treated cells revealed an increase in the chromosomal aberration level and micronuclei frequency (MNF). The chromosomal aberration(CA)were characterized as chromatid break, chromosome break, acentric fragment, dicentric chromosome and gaps. With the increase of treatment concentrations the aberration level and MNF increased and the mitotic index(MI) and the nuclear division index (NDI) values declined in a dose-response manner(P0.05). The treatments of normal ambient air PM2.5 from Baotou City were significant higher than those of Wuwei City, but the treatments of dust storm PM2.5 were not significant different between the cities. Conclusion Dust storm PM2.5 from Baotou City and Wuwei City may cause human lymphocytes genetic damage and its genetic toxicity is related to the dose.
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Objective To investigate the sorts and quantities of air fungi in air and its change in every month in the west of Luzhou City. Methods The experiment glass slice was exposed every day and the experiment container was exposed every month in one year so as to investigate air fungi in Luzhou Library Building in the west of Luzhou City. The fungi were separated and cultured, the specimens of fungi were pressed on glass slice timely, dyed with methyl blue and identified. Results 365 experiment glass slices were exposed every day in one year. 24 139 fungi spores were checked and 23 582 were identified. They belonged to 24 species. The air fungi spores in the experiment glass slice according to their quantity were Alternaria(30.61%), Ustilaginales(23.90%), Epicoccum(18.71%), Hormodendrum(13.91%). The air fungi in the experiment container according to their quantity were Saccharomyces(50.20%), Aspergillus(12.46%), Penicillium(10.77%), Hormodendrum(9.29%) and so on. There were a lot of air fungi in the west Luzhou City all the year round. The air fungi quantity was high during May to September in a year. Conclusion A lot of fungi wave to and fro in air in the west of Luzhou City all the year round. The quantity of air fungi changes as the season goes on and it is high during May to September. The main fungi are Alternaria, Ustilaginales, Epicoccum, Hormaodendrum and so on.