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首页> 外文期刊>Environmental Science & Technology >A Novel Technique to Determine Cobalt Exchangeability in Soils Using Isotope Dilution
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A Novel Technique to Determine Cobalt Exchangeability in Soils Using Isotope Dilution

机译：同位素稀释法测定土壤中钴交换性的新技术

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The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(Ⅱ) after addition to soils with varying physical and chemical characteristics. A potential risk in quantifying exchangeable Co in soils using isotope dilution techniques is the possible presence of two species of Co in soil solution and adsorbed on soil solid phases [Co(Ⅱ) and Co(Ⅲ)], coupled with the possibility that when an isotope of Co is added it may undergo a change in oxidation state during the measurement phase. In this study, we have utilized an isotope dilution technique with cation exchange and high-performance liquid chromatography-inductively coupled plasma-mass spectrometry to determine the isotopically exchangeable Co fraction in several soils with varying characteristics such as differing Al, Fe, and Mn oxide content; pH; and organic carbon content. The application of the cation exchange procedure adjusts measurements of isotopically exchangeable Co to correct for the presence of non-exchangeable ~(57)Co not in equilibrium with the solution phase. Results indicated that oxidation of added ~(57)Co(Ⅱ) to ~(57)Co(Ⅲ) or precipitation of ~(57)Co(Ⅱ) may occur on the surfaces of some soils, particularly those with a high pH or substantial quantities of Mn oxide minerals. No detectable Co(Ⅱ)_((aq)) was found in the aqueous extracts of the soils examined.
机译：钴污染造成的环境风险很大程度上取决于其氧化态。我们的目的是评估添加到具有不同物理和化学特性的土壤中后，Co的潜在生物利用度以及可溶性Co（Ⅱ）的反应和去向。使用同位素稀释技术定量分析土壤中可交换Co的潜在风险是土壤溶液中可能存在两种Co并吸附在土壤固相[Co（Ⅱ）和Co（Ⅲ）]上，以及当添加的Co同位素在测量阶段可能会发生氧化态变化。在这项研究中，我们利用阳离子交换和高效液相色谱-电感耦合等离子体质谱联用的同位素稀释技术，确定了几种具有不同特征（如铝，铁和锰氧化物不同）的土壤中同位素可交换的钴含量。内容; pH值和有机碳含量。阳离子交换程序的应用调整了同位素可交换Co的测量值，以纠正不与溶液相平衡的不可交换〜（57）Co的存在。结果表明，〜（57）Co（Ⅱ）向〜（57）Co（Ⅲ）添加的氧化作用或〜（57）Co（Ⅱ）的沉淀可能在某些土壤的表面上发生，特别是那些pH值高或大量的Mn氧化物矿物。在所检测土壤的水提物中未发现可检测到的Co（Ⅱ）_（（aq））。

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