Baker, Hutaf, and Fawwaz Khalili. “Effects of PH and Temperature on the Interaction of Pb(II) With Azraq Humic Acid Studied With Schubert’s Ion Exchange Method”. Annals of Environmental Science 1 (March 7, 2007). Accessed May 2, 2024. https://openjournals.library.northeastern.edu/aes/journal/article/view/v1art5.