Abstract：Objective To understand the status of total hardness of municipal water supply in Guangxi, and to provide a scientific basis for the next research on the relationship between drinking water hardness and health. Methods Surveillance data about urban drinking water in Guanxi Province during 2017-2019 were derived from the National Drinking Water Quality Monitoring Information System. The information about water supply was obtained from data collection and on-site survey. All drinking water samples were collected, preserved, transported and tested according to the Standard Examination Methods for Drinking Water (GB/T 5750-2006), and the quality of drinking water was evaluated based on the Hygienic Standard for Drinking Water (GB 5749-2006). Results Test results showed that the total hardness of tap water in the urban areas of Guangxi from 2017 to 2019 ranged from 0.0 mg/L to 266.8 mg/L, with a qualified rate of 100.0%. The total hardness of tap water in different years showed statistically significant difference (P<0.001). There were statistically significant differences in the total hardness of tap water from different regions (P<0.001), with the highest being 210.4 mg/L in Hechi City and the lowest being 9.8 mg/L in Fangchenggang City. The hardness of tap water with different types of water sources and the hardness of tap water with same type of water sources in different cities were statistically significantly different (P<0.001). The hardness of tap water with groundwater source was the highest (165.3 mg/L), followed by river water source (125.0 mg/L), and that of tap water with reservoir water source was the lowest (93.9 mg/L). The pH value of tap water was positively correlated with the total hardness (rs=6.22, P<0.001), and there was a closely positive correlation between the total dissolved solid and the total hardness(rs=0.907, P<0.001). Conclusions The total hardness of drinking water in cities of Guangxi meets the national standard, but there are differences in the total hardness of tap water in different regions and with different types of water sources. It is necessary to conduct the research on the impact ofdrinking water hardness on health of relevant population based on the surveillance results and guide the population to reasonable diet and healthy drinking water according to the drinking water characteristics in different places.
[1] Klevay LM.Some bottled water may be salubrious[J]. J Trace Elem Med Biol,2018,48:188-189. [2] Yousefi M, Najafi Saleh H,Yaseri M, et al.Association of consumption of excess hard water, body massindex and waist circumference with risk of hypertension in individuals living in hard and soft water areas[J]. Environ Geochem Health,2019,41(3):1213-1221. [3] Nagy J,Sipka S,SipkaJr S, et al.The hardness of drinking water negatively while socio-economic deprivation positively correlate with the age-adjusted mortality rates due to cardiovascular diseases in Hungarian wine regions[J]. Int J Environ Res Public Health,2019,16(18):3437. [4] Wasana HM, Aluthpatabendi D, Kularatne WM, et al. Drinking water quality and chronic kidney disease of unknown etiology (CKDu): synergic effects of fluoride, cadmium and hardness of water[J]. Environ Geochem Health,2016,38(1):157-168. [5] Kozisek F.Regulations for calcium, magnesium or hardness in drinking water in the European Union member states[J]. Regul Toxicol Pharmacol,2020,112:104589. [6] 世界卫生组织. 饮用水水质准则(第4版)[M]. 上海: 上海交通大学出版社,2014: 290. [7] 蔺艳,张莹茜,盘强文, 等. 锶矿泉水对人血管内皮细胞的增殖和功能的影响[J]. 中国食品卫生杂志,2013,25(2):136-139. [8] 廖兵荣,熊筱娟,伍晓春. 江西省温汤天然矿泉水对期望寿命的影响分析[J]. 宜春学院学报,2014,36(12):62-64. [9] 万英,陈蓉,冯志强,等. 富锶矿泉水对大鼠血清生化指标的影响[J]. 中国食品卫生杂志,2014, 26(2):133-136. [10] Liu YL, Luo KL, Lin XX, et al. Regional distribution of longevity population and chemical characteristics of natural water in Xinjiang, China[J]. Sci Total Environ,2014,473-474:54-62. [11] Aslanabadi N,Habibi Asl B,Bakhshalizadeh B,et al. Hypolipidemic activity of a natural mineral water rich in calcium, magnesium, and bicarbonate in hyperlipidemic adults[J]. Adv Pharm Bull,2014,4(3):303-307. [12] 徐华成,徐晓军,王凯,等. 饮用水氧化还原电位的影响因素分析[J]. 苏州科技学院学报(工程技术版),2007,20(2):63-66. [13] 卢婵. 三种饮用水抗氧化功能的研究[D]. 福州:福建医科大学, 2018. [14] 骆莹莹,姚树桐,王大新,等. 氧化应激在动脉粥样硬化发生发展中作用的研究新进展[J]. 中国介入心脏病学杂志,2013,21(1):46-50. [15] 夏世金,孙涛,吴俊珍. 自由基、炎症与衰老[J]. 实用老年医学,2014,28(2):100-103. [16] 崔博,陈岐辉,陈晓英,等. 吉林省尿石症高发地区饮用水微量元素及主要阴离子检测[J]. 吉林大学学报(医学版),2010,36(3):599-602. [17] 郑国亮.长期饮用纯净水与肾结石的发病关系[J]. 医学信息,2013,26(4):420-421. [18] 陈惠琴,张亚平,姚美琳,等. 龙岩市低硬度低pH饮用水的水质分析[J]. 实用预防医学,2002,9(1):68-69. [19] 广西壮族自治区统计局.广西统计年鉴2019[M].北京:中国统计出版社,2020,180-181. [20] 黎勇,钟格梅,黄江平,等. 2008—2012年广西农村饮用水总硬度监测结果分析[J]. 环境卫生学杂志,2014,4(3):259-261,268. [21] 周金华,谢活强,钟嶷,等. 2016—2017年广州市农村生活饮用水pH值等指标分析[J]. 医学动物防制,2019,35(3):275-278. [22] 王子豪,赵怡楠,王正虹. 饮用水部分理化指标相关性研究[J]. 中国卫生工程学,2019,18(2):188-190.
2021, Vol. 28 
