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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 |
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| 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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