A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxyPhenyl azo) Naphthalene -1- Sulfonic Acid. IHJPAS. 2016;24(1). Accessed May 21, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/869