Analysis of Total Hardness of Domestic Drinking Water in Chancheng District,Foshan City
Objective:To investigate the total hardness of drinking water in Chancheng district,Foshan city,Guangdong province,and to provide scientific basis for improving the quality of drinking water.Method:The end water of drinking water in Chancheng district of Foshan city from 2021 to 2024 was sampled and analyzed according to the national standard.Result:A total of 204 water samples were tested from 2021 to 2024,and the qualified rate was 100%.The average total hardness was 96.5 mg·L-1(from 67.1 mg·L-1 to 142.7 mg·L-1).According to the total hardness grade of China,8 parts of extremely soft water(3.9%),196 parts of soft water(96.1%),and other grades were not detected.The mean value of total hardness of water samples in 2024 was the lowest(87.6 mg·L-1),and the difference of total hardness of water samples in different years was statistically significant(progressive F=13.2,P＜0.01).The total hardness was lower in wet period and higher in dry period.The difference of total hardness was statistically significant in different water periods(t=-4.09,P＜0.01).Conclusion:The drinking water in Chancheng district of Foshan city in recent years is mainly soft water,which is relatively good,but the overall hardness value is low,suggesting that residents can increase the intake and supplement of calcium and magnesium elements in their daily diet.
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