摘要
南极洲万达湖湖水上部为氧化环境,铬浓度较低,Cr^(6+)占主导地位,主要以CrO_4^(2-)形式存在;下部为还原环境,铬浓度高,Cr^(3+)为主,以Cr(OH)_2^+和Cr(OH)^(2+)形式存在。湖水中锰、铁的氧化物及氢氧化物颗粒对铬离子的吸附和释放过程,控制了湖水铬浓度的变化。
Vanda Lake is located in Wright Valley of Antarctica, it is a saline lake with typical dimictic calcium chloride. This paper discusses the vertical geochemical distribution of chromium concentration. In Vanda Lake water, chromium exists in two valence states: Cr6+ and Cr3+. In oxygenated fresh lake water, chromium concentration is low and Cr6+ concentration predominates, and chromium exists in CrO42- form. In reduced brine, chromium concentration is high and Cr3+ concentration predominates and chromium exists in Cr(OH)2+ and Cr(OH)2+ form. The important role of sinking particles in the vertical migration of chromium in lake-water is discussed.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1992年第6期591-598,共8页
Oceanologia Et Limnologia Sinica
基金
美国科学基金会(NSF)资助
关键词
铬
盐湖
万达湖
南极洲
Antarctica, Vanda Lake, Sinking particles, Migration.
