The pH value control in air plasma–liquid system by sodium bicarbonateBangbang He, Xinning Gong, Yupengxue Ma, Xin Wang, Junshuai Li, Qing Xiong and Qiang ChenEur. Phys. J. D, 73 2 (2019) 40DOI: https://doi.org/10.1140/epjd/e2019-90221-3