【摘 要】
：
珊瑚是记录海洋环境变化信息的载体之一,测定其U/Ca比值可重建海水温度或测定Th/U同位素比值可计算年龄重建海平面高度等.准确测定珊瑚中U、Th含量及同位素比值是提取所记载的海洋环境变化信息的前提,其难点在于高Ca基体分离和痕量U、Th富集纯化.基于此,本研究拟采用UTEVA树脂改进了一步富集分离珊瑚中U、Th的前处理方法,并联合高分辨电感耦合等离子体质谱仪测定U、Th含量.结果证明:上样介质HNO3浓度由3 mol/L降至2 mol/L不影响U、Th的吸附效率,用2 mL Milli-Q水可将U完全洗脱
【机 构】
：
华东师范大学河口海岸学国家重点实验室,上海 200241;赛默飞世尔科技(中国)有限公司,上海 200125;海南大学海洋学院南海海洋资源利用国家重点实验室,海南海口 570228
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珊瑚是记录海洋环境变化信息的载体之一,测定其U/Ca比值可重建海水温度或测定Th/U同位素比值可计算年龄重建海平面高度等.准确测定珊瑚中U、Th含量及同位素比值是提取所记载的海洋环境变化信息的前提,其难点在于高Ca基体分离和痕量U、Th富集纯化.基于此,本研究拟采用UTEVA树脂改进了一步富集分离珊瑚中U、Th的前处理方法,并联合高分辨电感耦合等离子体质谱仪测定U、Th含量.结果证明:上样介质HNO3浓度由3 mol/L降至2 mol/L不影响U、Th的吸附效率,用2 mL Milli-Q水可将U完全洗脱,U、Th的全流程空白值(mean±1σ,n=12)分别为(1.32±0.65)pg、(2.05±0.63)pg,显著降低了U的全流程空白值.测定了3个海南滨珊瑚中U含量(mean±1σ,n=6),分别为(3.46±0.02)μg/g、(2.67±0.05)μg/g、(2.15±0.07)μg/g,Th含量(mean±1σ,n=6)分别为(10.12±0.24)ng/g、(4.82±0.10)ng/g、(5.62±0.12)ng/g,测定精度均在3.3％以内,U、Th加标回收率分别为97.9％～100.9％、97.3％～99.7％,方法准确度高,精密度好.本研究可为测定珊瑚等碳酸盐类样品中U、Th含量及其同位素提供准确、简便和快速的样品前处理方法.
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