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中太平洋北部锰结核和沉积物中痕量铯的分布
秦学祥1, 邹本川1, 张振生1, 乔聚海1, 杜春艳1
国家海洋局第一海洋研究所
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THE DISTRIBUTION OF TRACE CESIUM IN THE MANGANESE NODULES AND SEDIMENTS IN THE NORTH MID-PACIFIC Qin Xuexiang Zou Benchuan Zhang Zhensen
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.
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