Li, Yan, and Dong Zhang. 2014. “Determination of Palladium in Surface Water and Gold Ore Samples by Flame Atomic Absorption Spectrophotometry After Pre-Concentration With the Porous Nano-Calcium Titanate by Sorghum Straw Template Method”. Asian Journal of Chemistry 26 (14):4416-18. https://doi.org/10.14233/ajchem.2014.16832.