Li X-M, Li Z-G, Zhu L, Chen J, Yang G, Zhang K. Study on the Solid Phase Extraction and Spectrophotometric Determination of Gold with 5- (2-Hydroxy-4-nitrophenylazo)thiorhodanine. ajc [Internet]. 2010 Mar. 30 [cited 2024 Oct. 3];18(3):2341-7. Available from: https://asianpubs.org/index.php/ajchem/article/view/20993