【摘要】 <正> 自发现大洋锰结核以来,围绕着分散于洋底的巨量锰结核的动向、探究其化学成分各组分的来源,锰结核的生长速率及开发利用等问题,引起了许多国家科学家的关注。根据过去大洋锰结核的化学成分分析,Mekelvey(1983)指出,在锰结核中可测出56种化学元素的含量,他列举了其中含有率超过0.01％的28种元素。但锰结核中痕量铯的含量分布迄今尚未见到报道。Folsom曾研究过太平洋(28°N,122°W)中溶解铯的垂直分布,提出铯在表层更多还原

【Abstract】 The levels of trace cesium and activity of cesium-137 in twenty-seven manganese nodule and sediment samples collected from the North Mid-Pacific were measured by atomic absorption spectrophotometry and beta counting respectively.The analytical results indicated that the distributions of cesium in the manganese nodules and sediments showed definite differences due to different formations of manganese nodules, depositional environments and sediment types.The contents of cesium in manganese nodules and sediments ranged from 0.3 to 1.2 μg/g and 0.8 to 13.0 μg/g respectively. The activity of cesium-137 was lower than the instrument detective limit, and was therefore not detected in all the samples.From our analytical results it can be seen that the contents of trace cesium in the sediment samples are in the following sequence: brownish mud > brownish clay > sili-ceouscalcareaus ooze > calcareous ooze.更多还原