Monitoring results of drinking water quality in Jianhe County of Guizhou Province from 2009 to 2011
10.3760/cma.j.issn.2095-4255.2013.05.014
- VernacularTitle:2009-2011年贵州省剑河县农村饮用水水质监测结果
- Author:
Yun-feng, WU
- Publication Type:Journal Article
- Keywords:
Rural area;
Drinking;
Water quality detection;
Qualified rate
- From:Chinese Journal of Endemiology
2013;32(5):523-525
- CountryChina
- Language:Chinese
-
Abstract:
Objective To find out the hygienic status of rural drinking water in Jianhe County of Guizhou Province.Methods Forty-eight source water and tap water samples from small centralized water supply stations in 12 townships of Jianhe County in dry season and wet period were tested from 2009-2011.The water samples were examined in accordance with the relevant provision of Standard Examination Methods for Drinking Water (B/T5750-2006).The contents included:①sensory indicators:standard color,turbidity,smell and taste and visible objects; ②general chemical indicators:pH,iron,manganese,chloride,sulfate,total dissolved solids,total hardness,oxygen consumption and ammonia; ③toxicological indicators:fluoride,arsenic and nitrate; ④microbial indicators:total number of colonies,with a total population of Escherichia coli and heat-resistant Escherichia coli Outcome evaluation was carried out in accordance with the Drinking Water Health Standards (B/T 5.749-2006).Results A total of 192 rural water samples were collected in 2009-2011,and 18 samples were qualified,accounting for 9.38％.The differences of water passing rate between groups of years were statistically significant (x2 =14.74,P＜ 0.01).Rural drinking water quality in dry season (18.75％,18/96) was better than that in wet season (0.00％,0/96; x2 =19.76,P ＜ 0.01).Passing rate of source water quality (16.67％,16/96) was higher than that of tap water(2.08％,2/96; x2 =11.95,P ＜ 0.01).Sensory indicators and toxicological indicators of 192 water samples were qualified.General chemical indicators:in addition to four water samples with pH exceeded the standard(two copies in 2009 and two copies in 2010),other test indicators were qualified.Microbiological indicators:passing rates of the total number of colonies,Escherichia coli group and heat-resistant Escherichia coli group were 77.08％ (148/192),9.90％ (19/192) and 20.31％ (39/192),respectively.Passing rate of microbes was 18.75％ (18/96) in dry season and 0.00％ (0/96) in wet period,and microbes passing rate was significantly higher in dry season than that of the wet period(x2 =19.76,P ＜ 0.01).Passing rate of microbes was 16.67％(16/96) in source water and 2.08％(2/96) in tap water,and passing rate of the source water was significantly higher than that of the tap water(x2 =11.95,P ＜ 0.01).Conclusions The hygienic status of rural drinking water in rural areas of Jianhe County of Guizhou Province is poor.Microbial pollution is the main reason.
