广西农村2014—2019年饮用水水质锰监测结果分析

Drinking water quality assessment for manganese in rural areas of Guangxi Province during 2014-2019

【目的】探讨广西农村饮用水水质锰含量分布情况,为保障饮用水安全提供依据。【方法】依据GB 5749-2006《生活饮用水卫生标准》对2014—2019年广西农村饮用水中锰指标的监测结果进行分析和评价,并对锰指标进行分析。【结果】2014—2019年共检测水样47637份,锰检出范围为0.05-2.71 mg/L,检出率为28.46%,水质锰指标合格率为99.46%,不同年份水质锰合格率差异有统计学意义(X^2=25.049,P<0.01),且随着年份的递增,水质锰指标合格率呈上升趋势(X^2=17.498,P<0.01);枯水期水锰合格率高于丰水期(X^2=5.871,P<0.05),集中式供水水锰合格率高于分散式供水(X^2=90.983,P<0.01),大型集中式供水工程供水水质锰合格率高于小型集中式供水工程(X^2=10.294,P<0.01);不同地理区域锰指标合格率差异有统计学意义(X^2=103.908,P<0.01),桂中〉桂西〉桂北〉桂南〉桂东。【结论】广西农村地区属于低水锰和高水锰地区并存,表现为大部分地区饮用水呈现低水锰状态,部分地区呈现高水锰局部点状分布。

[Objective]To determine the content and distribution of manganese in rural drinking water in Guangxi province,and to provide scientific evidence for improving drinking water quality and safety.[Methods]The monitoring results of manganese in rural drinking water in Guangxi from 2014 to 2019 were evaluated according to GB 5749-2006 Sanitary Standards for Drinking Water.[Results]47637 samples were analyzed during 2014-2019.Manganese detection rate was 28.46%,with the range from 0.05 to 2.71 mg/L,and the qualified rate was 99.46%.The difference of manganese compliance rate in different years was statistically significant(χ2=25.049,P<0.01),and the rate increased with the increase of year(χ2=17.498,P<0.01).The compliance rate in dry seasons was higher than that in wet seasons(χ2=5.871,P<0.05).The qualified rate of manganese was statistically different between the water samples collected from centralized and scattered supply sources(χ2=90.983,P<0.01).The qualified rate of manganese in large centralized water supply was higher than that in small centralized water supply(χ2=10.294,P<0.01).The geographic distribution of the qualified manganese rate was in the following order:center>west>north>south>east.(χ2=103.908,P<0.01).[Conclusion]There are high and low concentrations of water manganese in rural areas of Guangxi.While most areas showed low manganese in drinking water,some areas dispayed a local point distribution of high water manganese.