Hu Q
Institute of Microbiology and Epidemicology, Academy of Military Medical Science, Beijing, China.
Wei Sheng Yan Jiu. 1997 Jul;26(4):226-31.
The changes of atmospheric bacterial particle concentrations in three areas--Beijing, Tianjin and Shenyang, were investigated in different seasons and period of one day. The samplers used in this study were MF-45 and HTK-201 air microbial samplers. The results showed that the concentrations of atmospheric bacterial particle in Beijing and Tianjin are higher in spring than those in other seasons. They are 2053/m3 and 2556/m3 respectively in spring, 995/m3 and 1064/m3 respectively in summer. The concentrations of atmospheric bacterial particle in Shenyang is higher in autumn (10108/m3) and lower in winter (1294/m3). The changes of atmospheric bacterial particle concentrations have two peak values during a day. The two high peak values are at 6:00 to 7:00 and 18:00, while the two low values are at 11:00 to 13:00 and 1:00 to 2:00. We sampled the atmospheric bacterial particles at 4 different combinations of sampling time in the three cities. They were 12, 8, 6 and 4 times a day. The sampling time combination was analyzed by mathematical statistics according to the results. The best sampling time was decided by the statistics results and time distribution character of atmospheric bacterial particle concentration in different seasons and period of one day. The concentration of atmospheric bacterial particle should be detected in the middle month of the four seasons: January, April, July and October. Sampling time at 7:00, 10:00, 13:00, 16:00, 19:00, 22:00, 1:00 and 4:00 could be selected for 8 times sampling a day. The sampling time sequence should be at 5:00, 11:00, 17:00 and 23:00 for 4 times sampling a day. The four times sampling at daytime in spring and fall should be at 6:00, 9:00, 12:00 and 19:00; 5:00, 9:00, 13:00 and 17:00 in summer; 7:00, 10:00, 13:00 and 16:00 in winter.
对北京、天津和沈阳三个地区大气细菌颗粒浓度在不同季节和一天内不同时段的变化情况进行了调查。本研究中使用的采样器为MF - 45和HTK - 201空气微生物采样器。结果表明，北京和天津大气细菌颗粒浓度春季高于其他季节。春季分别为2053/m³和2556/m³，夏季分别为995/m³和1064/m³。沈阳大气细菌颗粒浓度秋季较高（10108/m³），冬季较低（1294/m³）。大气细菌颗粒浓度在一天内有两个峰值。两个高峰值出现在6:00至7:00和18:00，而两个低值出现在11:00至13:00和1:00至2:00。我们在这三个城市以4种不同采样时间组合对大气细菌颗粒进行采样。分别是每天12次、8次、6次和4次。根据结果对采样时间组合进行数理统计分析。根据统计结果以及不同季节和一天内不同时段大气细菌颗粒浓度的时间分布特征确定最佳采样时间。应在四季的中间月份：1月、4月、7月和10月检测大气细菌颗粒浓度。一天进行8次采样时可选择7:00、10:00、13:00、16:00、19:00、22:00、1:00和4:00的采样时间。一天进行4次采样时采样时间顺序应为5:00、11:00、17:00和23:00。春季和秋季白天的4次采样应为6:00、9:00、12:00和;夏季为5:00、9:00、13:00和17:00;冬季为7:00、10:00、13:00和16:00。
