Lei, Xiangrong, Xiaoling Wei, Qi Gong, Qiuyang Wei, and Lisheng Wang. 2012. “Determination of Trace Potassium in Concentration Salt Solution by Anti-Fluorescence Quenching Method on Rhodamine B-Sodium Tetraphenylborate System”. Asian Journal of Chemistry 25 (3):1285-89. https://doi.org/10.14233/ajchem.2013.12902.