Monitoring results of drinking water quality in Nanyang City of Henan Province from 2022 to 2023
Objective To understand the quality of drinking water in Nanyang City,Henan Province,and explore the main factors affecting the quality of drinking water,so as to provide scientific basis for further improving the quality of drinking water in urban and rural areas.Methods From 2022 to 2023,urban and rural drinking water monitoring sites were set up in Nanyang jurisdiction,and the basic situation of water suppliers at each monitoring site was investigated.Water samples were collected once during dry season and wet season respectively;microbial,toxicological,sensory properties and general chemical indexes were detected according to the Standard Test Method for Drinking Water(GB/T 5750-2006/2023),and the results were assessed according to the limit value of the Standard for Drinking Water Quality(GB 5749-2006/2022).Results From 2022 to 2023,a total of 302 water suppliers were investigated in Nanyang City,and 259 small-sized water suppliers,accounting for 85.76％;275 suppliers were in rural areas,accounting for 91.06％.There were 272 suppliers using underground water,accounting for 90.07％;217 suppliers conducted water treatment with disinfection only,accounting for 71.85％;253 suppliers conducted disinfection using chlorine dioxide,accounting for 83.78％.A total of 2 330 water samples were tested,and of them,2 218 were qualified,with the qualified rate of 95.19％.The qualified rate was higher for urban drinking water(98.94％)than that for rural water(94.25％),higher for underground water(96.44％)than that for surface water(87.87％),and higher for treated and disinfected drinking water(97.4％,95.69％,94.79％)than that for untreated drinking water(90.63)(x2values were 18.03,46.34,14.34,respectively,all P＜0.05).There were 8 unqualified indexes,and the difference in the unqualified rates for indexes was statistically significant(x2=100.80,P＜0.05).The unqualified rates of the total number of colonies,nitrate nitrogen and total coliform were relatively high,and all of them were more than 1％.Conclusions The qualified rate of drinking water in Nanyang City is higher in urban areas than that in rural areas;water treatment technology is an important factor affecting water quality,and microbial index is the main index affecting water quality.It is suggested that relevant departments strengthen water source protection,water disinfection and water supply sanitation management to further improve the quality of drinking water and ensure the health and safety of drinking water for urban and rural residents.
NETL
NSTL
万方数据
