氧化镁烧结-电感耦合等离子体质谱法测定砂岩型铀矿中的痕量铼

砂岩型铀矿中铀的平均含量为635μg/g,而铼的含量仅为0.3~1.9μg/g,由于铼的含量低,准确测定高含量铀矿样中的低含量铼仍是分析化学的一个难题。本文建立了电感耦合等离子体质谱法测定砂岩型铀矿中痕量铼的方法。样品经过氧化镁烧结,热水浸提以及采用103Rh作内标元素等方式消除了铀、钼及其他基体元素对测定铼的干扰。在最佳条件下,痕量铼的检出限可低至0.12 ng/g,回收率达99.8%。本方法通过多种标准样品验证,铼的测定值与标准值吻合,对铼含量在0.06~180.57μg/g范围内的实际样品进行测定,相对标准偏差均小于1.5%,能够满足砂岩型铀矿等高含量铀矿中痕量铼的测定需求。

Determination of Trace Rhenium in Sandstone-type Uranium Deposits by Inductively Coupled Plasma-Mass Spectrometry with Magnesium Oxide Sintering

The petroleum inclusion in NaCl crystal is synthesized during the evaporation process of the mixed solution of saturated NaCl solution and light crude oil. And the same crude oil is also sealed in fused capillary tubing. Three kinds of petroleum-bearing inclusion are recognized at room temperature. (1) single-phase petroleum inclusion which only trapped petroleum, (2) gas and petroleum bearing two-phase inclusion which trapped both the petroleum and air, (3) gas, petroleum and aqueous bearing three-phase inclusion which trapped the air, petroleum and NaCl saturated solution. The petroleum-bearing inclusion show yellow-green and blue under blue-green fluorescence.The individual petroleum-bearing inclusions and sealed petroleum in fused capillary tubing were analyzed by laser ablation GC-MS analysis method. But the parameters characteristics of isoprenoids hydrocarbon in synthetic inclusions and crude oil were similar. So using these parameters is still a powerful and reliable tool to trace the source rock of the crude oil.