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中文摘要：
利用新型阴离子交换树脂分离沉积物中的重金属Pb，采用表面热电离质谱法（TINS）测定了沉积物样品中的Pb同位素组成。新型树脂为大孔径阴离子树脂AG—MP—1M，淋洗液采用低浓度的盐酸，避免了使用难以纯化的氢溴酸，可有效地降低试剂空白。通过对铅同位素标准物质NIST NBS-981的重复测试，方法的精密度（〈0．5％，2s）和准确度均达到了应用研究的要求。对5个实际沉积物样品中的铅同位素组成进行测定，获得了理想的分析效果。
英文摘要：
A method tor the determination of lead isotope ratio （^208 pb/^204 Pb, ^207pb/^204 Pb, ^206pb/^204 Pb） in sediment samples by thermal ionization mass spectrometry （TIMS） has been developed. A new-type of anion exchange resin AG-MP-1M is used in separation and purification of Pb in sediment samples with low concentration of HCI as eluting reagent to avoid the use of HBr, which is difficult for purification effectively reduce the regent blank. Pb isotope Standard Reference Material NIST NBS-981 has been repeatedly measured and the results are in good agreement with certified values with precision of less than 0.5% （2s）. The method has been applied to the determination of Pb isotope composition in 5 sediment samples with satisfactory results.
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