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| 骆马湖现代沉积物137Cs和210Pbex的测定分析与环境指示意义 |
| Determination and Environmental Implications of 137Cs and 210Pbex in Modern Sediment from Luoma Lake |
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| DOI： |
| 中文关键词: 137Cs 210Pbex 重金属 沉积速率 现代沉积物 骆马湖 |
| 英文关键词: 137Cs 210Pbex Heavy metals Deposition rate Modern sediments Luoma Lake |
| 基金项目:江苏省自然科学基金资助项目（BK20171075）；省级地质勘查专项基金资助项目（苏财建〔2017〕160号） |
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| 中文摘要: |
| 选取骆马湖进湖口、湖中心和出湖口3个位置的沉积物柱芯样品，采用放射性核素137Cs、210Pbex纪年技术定年，对其垂向分布特征及沉积速率指标变化对比分析，并测定沉积物中重金属垂直剖面分布。结果表明：137Cs数值较低，不足以建立137Cs计年时标；210Pbex比活度随深度增加大致呈指数降低，采用210Pbex CIC模式计算获得3个采样点的平均沉积速率及对应的沉积年代区间，进湖口相比湖中心和出湖口沉积速率较低，这与人为活动和水流因素有关；近50年来，骆马湖重金属污染物蓄积峰值总体出现在1975—1977年及1989—1994年两个时期，在2008年之后重金属的蓄积特征呈现逐渐增加趋势 |
| 英文摘要: |
| The sediment core samples from 3 positions of Luoma lake inlet, center and outlet were dated by radionuclide 137Cs and210Pbex dating method, the vertical distribution characteristics and the change of sedimentation rate index were compared and analyzed, the vertical profile distribution of heavy metals in the sediment were measured. The results showed that the value of 137Cs was too low to be as dating marker. The specific activity of 210Pbex decreased approximately exponentially with the increase in depth. The average deposition rate and the corresponding deposition age interval in the 3 positions were calculated by 210Pbex CIC model. The sedimentation rate in the lake inlet was lower than that in the center or outlet. This was related with human activities and water erosion. In the past 50 years, the peak accumulation of heavy metal pollutants in Luoma Lake occurred generally in the two periods of 1975—1977 and 1989—1994, and the accumulation has been increasing since 2008. |
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