Gao, Hong-Wen. “Dual- Wavelength Spectrophotometric Determination of Trace Amounts of Iron in Water and Food Using Copper-O-Chlorophenylfluorone Complex As Chromogenic Reagent ”. Asian Journal of Chemistry 12, no. 4 (March 30, 2010): 1101–1106. Accessed November 29, 2024. https://asianpubs.org/index.php/ajchem/article/view/23137.