【摘要】：保證Cd的高回收率以及徹底的Sn干擾去除是獲得精確鎘同位素組成的前提,目前報道的多種Cd分離與純化方法獲得的Cd回收率有較大差異(42.6%~99.8%),且去除Sn干擾的效果也不同(去除率在87.8%~97.4%之間),Cd回收率和Sn去除率均不理想。本文對前人報道的分離方法進行對比實驗,發(fā)現(xiàn)0.1 mol/L氫溴酸-0.5 mol/L硝酸是分離Cd和Sn的有效試劑,增加該組混合酸的用量可淋洗出樣品中更多的Sn且不會損失Cd,當(dāng)混合酸的淋洗用量增加至30 mL時,Sn的淋洗率達到99.8%以上,Cd的回收率亦達到99.0%±0.5%,可滿足土壤樣品鎘同位素的測定要求。本工作為獲得高精度的鎘同位素組成奠定了基礎(chǔ),為研究土壤環(huán)境中鎘的污染來源提供了技術(shù)手段。
[Abstract]:To ensure the high recovery of Cd and complete Sn interference removal is the premise of obtaining accurate cadmium isotopic composition. The recovery rate of Cd obtained by various methods of separation and purification of Cd reported at present is quite different (42.6% or 99.8%). The effect of removing Sn interference is also different (the removal rate is between 87.8% and 97.4%). The recovery rate of), Cd and the removal rate of Sn are not ideal. In this paper, the separation methods reported by predecessors were compared. It was found that 0.1 mol/L hydrobromic acid-0.5 mol/L nitric acid was an effective reagent for the separation of Cd and Sn. When the amount of mixed acid was increased to 30 mL, the elution rate of Sn was over 99.8%, and the recovery of Cd was 99.0% 鹵0.5%. It can meet the determination requirements of cadmium isotopes in soil samples. This work lays a foundation for obtaining high precision cadmium isotopic composition and provides a technical means for studying the sources of cadmium pollution in soil environment.
【作者單位】： 中國地質(zhì)調(diào)查局武漢地質(zhì)調(diào)查中心;
【基金】：中國地質(zhì)大調(diào)查項目——長江中游城市群活動構(gòu)造與地殼穩(wěn)定性評價(1212011120097)
【分類號】：S151.93
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本文編號：2398809