Direct and Derivative Spectrometric Determination of Zn(II) In Natural Water Sample Blood Serum and Milk: A Simple and Sensitive Spectrophotometric Method for Zinc Determination in Biological and Environmental Samples. JASRAE. 2018;15(12):195-199. Accessed June 27, 2025. https://ignited.in/index.php/jasrae/article/view/9220