Wang, Ying, Guang Jun Ren, and Dong Zhang. 2014. “Determination of Trace Zinc in Water by Flame Atomic Absorption Spectrometry After Preconcentration by Modified Organobentonite With 1-(2-Pyridylazo)-2-Naphthol”. Asian Journal of Chemistry 26 (14):4442-44. https://doi.org/10.14233/ajchem.2014.16871.