Abstract：Objective To investigate the differences in the detection results of nitrite, total number of colonies and total coliform bacteria in purified water treated by household water purifier and unpurified water so as to survey the purification effect of purifier on tap water and the sanitary condition of household water purifier. Methods One hundred and thirty-five households with home water purifier were randomly selected as the subjects. Samples of water from household water purifier and tap water were collected from each household, and the nitrite content, total number of colonies and total coliform bacteria were detected. The detection results were statistically analyzed. The hygienic status of different brands of water purifiers was compared. Results The highest nitrite content of water treated by household water purifier was 0.821 mg/L, which met the national drinking water standard (the limit standard of nitrite in drinking water was 1 mg/L). The total number of bacterial colonies in 26 water samples was higher than the standard limit of drinking water (100 cfu/ml), and the maximum value was 46,000 cfu/ml. The over-standard rate of total number of bacterial colonies was 19.26% (26/135). The detection results regarding total number of bacterial colonies and nitrite in 135 tap water samples were qualified. The over-standard rates of nitrite content and total number of colonies in tap water purified by water purifier increased, showing statistically significant differences in the detection results of tap water and purified tap water (P<0.001). There was a positive correlation between nitrite content and total number of colonies (P<0.001). There were statistically significant differences in the nitrite content and total number of colonies in drinking water from different brands of water purifiers (P<0.05). Conclusion There are hidden troubles of sanitary safety in residents' household water purifiers in Bao'an District; and hence, the public's knowledge regarding the proper use and maintenance of water purifiers needs to be improved urgently, andsanitary supervision on household water purifiers should be strengthened.
肖惠贞, 刘姗姗, 李行方, 陈震, 尹江伟, 钟伟燕, 曾雁玲, 林馥坡. 宝安区家用净水器过滤水中亚硝酸盐含量及细菌总数调查分析[J]. 实用预防医学, 2022, 29(11): 1308-1310.
XIAO Hui-zhen, LIU Shan-shan, LI Xing-fang, CHEN Zhen, YIN Jiang-wei, ZHONG Wei-yan, ZENG Yan-ling, LIN Fu-po. Nitrite content and total number of bacterial colonies in water treated with household water purifier in Bao'an District. , 2022, 29(11): 1308-1310.
2022, Vol. 29 
