The present investigation deals with the health risks due to fluoride and nitrate ions in drinking water of Virudhunagar district, Tamilnadu. A total of 143 water samples were collected for the assessment of fluoride and nitrate in groundwater. After the analysis of samples, it was found that the fluoride concentration exceeds the permissible limit of the Bureau of Indian Standards (BIS) in 61% of the analyzed samples, while nitrate concentration exceeds 37% of the samples. The water quality index of the samples employed suggests that of the analyzed samples, 19%, 33%, 36%, and 10% are excellent, good, poor, and very poor respectively, and the remaining 2% is unsuitable for drinking purposes. Piper, Chadha, and Gibbs plots were used for estimating the hydro-geochemical behavior of the samples. A correlation analysis was derived between the various parameters calculated. The non-carcinogenic health risk assessment of fluoride and nitrate was established by using the model recommended by the United States Environmental Protection Agency (USEPA). The calculated non-carcinogenic risk of fluoride and nitrate is between 0.1 to 12 with a mean of 1.8. A total of 63% of the samples exceed the acceptable limit of non-carcinogenicity recommended by the United States Environmental Protection Agency (USEPA). The spatial distribution plots were used to establish the non-carcinogenic risks and other water quality parameters.

本调查研究了泰米尔纳德邦维鲁德纳加尔地区饮用水中的氟离子和硝酸根离子对健康的危害。总共收集了143个水样本，用于评估地下水中的氟化物和硝酸盐。对样品进行分析后，发现在61％的分析样品中氟化物浓度超过了印度标准局（BIS）的允许极限，而硝酸盐浓度超过了37％。所用样品的水质指数表明，在所分析的样品中，分别为19％，33％，36％和10％分别为优，良，差和极差，其余2％不适合饮用。使用Piper，Chadha和Gibbs图来估计样品的水文地球化学行为。在所计算的各种参数之间得出相关性分析。氟化物和硝酸盐的非致癌性健康风险评估是使用美国环境保护署（USEPA）推荐的模型建立的。计算得出的氟化物和硝酸盐的非致癌风险为0.1至12，平均值为1.8。共有63％的样品超过了美国环境保护局（USEPA）推荐的可接受的非致癌性限值。使用空间分布图来建立非致癌风险和其他水质参数。计算得出的氟化物和硝酸盐的非致癌风险为0.1至12，平均值为1.8。共有63％的样品超过了美国环境保护局（USEPA）推荐的可接受的非致癌性限值。使用空间分布图来建立非致癌风险和其他水质参数。计算得出的氟化物和硝酸盐的非致癌风险为0.1至12，平均值为1.8。共有63％的样品超过了美国环境保护局（USEPA）推荐的可接受的非致癌性限值。使用空间分布图来建立非致癌风险和其他水质参数。