Monitoring of the iron and oxygen impurities in liquid sodium by laser-induced breakdown spectroscopy with a gas protection component. - Dong, Jingya; Feng, Ce; Zeng, Lingwei; Cao, Linyuan; Wang, Rongdong; Zhu, Qingfu; Bo, Hanliang (JAAS (Journal of Analytical Atomic Spectrometry), 2026)