Evaluation of Groundwater Quality for Heavy Metals by Using Chemical Indices Approach in Karachi, Pakistan. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 22, n. 2, p. 358 – 366, 2024. DOI: 10.21743/pjaec/2021.12.14. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/111. Acesso em: 4 jul. 2025.