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同位素  2015 

GasBenchⅡ-IRMS测定微量碳酸盐中碳氧同位素比值方法研究

DOI: 10.7538/tws.2015.28.01.0041, PP. 41-47

Keywords: 微量碳酸盐,碳氧同位素,GasBench,Ⅱ-IRMS

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Abstract:

采用DeltaVAdvantage质谱仪与GasBenchⅡ在线制样装置,分别用12mL和3.7mL的样品瓶,对不同质量(5~50μg)的碳酸盐标准样品(IAEA-CO-1)进行碳氧同位素组成测定。测试结果表明,当取样量小于40μg,且用12mL样品瓶进行酸化测试时,δ13C和δ18O测量结果的内部标准偏差一半以上大于0.1‰,不能满足测试要求。当改用3.7mL样品瓶,样品取样量在15~50μg时,δ13C的内部标准偏差为0.01‰~0.07‰,δ18O的内部标准偏差为0.01‰~0.08‰,满足测试要求。所以,当样品量较少时,GasBenchⅡ在线制样装置可以通过改用3.7mL样品瓶,实现对低至15μg微量碳酸盐样品的碳氧同位素精确测量。同时,碳酸盐样品的质量与峰面积具有很好的线性关系(R2>0.9932),表明该方法也可用于样品中碳酸盐含量的测定。

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