Geo-chemical processes during the mixing of seawater and fresh water in estuarine regions and their effect on water fluorine levels - QIAO, CHEN; DECHENG, HAO; JIUCHUAN, WEI; CUIPING, JIA; HONGMEI, WANG; LONGQING, SHI; SONGLIANG, LIU; FANGZHU, NING; YUHAN, JI; FANGYING , DONG; ZHIWEN, JIA (MAUSAM, 2019)