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[前沿] 利用连续流质谱同步测定水中氧同位素和DIC碳同位素

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发表于 2014-3-28 01:42 | 显示全部楼层 |阅读模式
RATIONALE
The oxygen isotope study of water reservoirs (δ18OH2O values) and the carbon isotope study of dissolved inorganic carbon (δ13CDIC values) are powerful tools to decipher Earth's past and present environmental changes. This study presents a novel online analytical technique, namely the DIC evolved CO2 Gas Equilibration Method (DIC-CO2-GEM), in which the δ18OH2O and δ13CDIC values can be simultaneously determined from a single solution sample.

METHODS
The DIC-CO2-GEM measures both δ18OH2O and δ13CDIC values concurrently by combining the fundamental principles of the classic CO2-H2O equilibration and gas evolution methods, respectively. Phosphoric acid is used to convert dissolved inorganic carbon in a solution sample of 0.2 mL into gaseous CO2, which is then equilibrated with the solution at 25 °C. The oxygen and carbon isotope compositions are subsequently determined via continuous-flow isotope ratio mass spectrometry from the single solution sample.

RESULTS
Results obtained employing the DIC-CO2-GEM are in good agreement (<±0.07‰ for δ18OH2O values and < <±0.1‰ for δ13CDIC values) with those acquired using each of the traditional techniques. For both oxygen and carbon isotope measurements, an addition of 0.01 mL phosphoric acid yields the most consistent results between our technique and the traditional methods.

CONCLUSIONS
Devised to combine the traditional approaches independently assessing δ18OH2O and δ13CDIC values, the DIC-CO2-GEM is less complex and highly efficient. It preserves the modern precision requirements for oxygen (±0.09‰) and carbon (±0.18‰) isotope analyses while accurately measuring both parameters simultaneously. This innovative method generates an abundance of data while minimizing resources and is suitable for a variety of practical applications. Copyright © 2014 John Wiley & Sons, Ltd.
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氧同位素, 溶解无机碳, 碳同位素, 同步测定, 连续流
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