激光水同位素分析仪测定水中^(17)O-excess的长期稳定性

Long-term stability of the measurement of^(17)O-excess in water using laser water isotope analyzer

为验证激光水同位素分析仪测定水中^(17)O-excess的长期稳定性,在过去4年中使用国际标准水样VSMOW2和SLAP2对3种国际标准水GISP、USGS45、USGS47及3种实验室标准水Lab1、Lab2和Lab3进行了标定,得到高精度的^(17)O-excess结果(<10per meg,1SD),并显示2019~2022年间国际标准水样和2019~2021年间实验室标准水样的标定结果均在误差范围内保持一致,2022年重新配制实验室标准水后检测到三氧同位素组成的变化,说明该测试方法具有长期稳定性,并且能够分辨水样的三氧同位素组成变化,为测定不同水样中三氧同位素组成提供了技术支撑。

Three international standard water GISP,USGS45,USGS47,and three laboratory standard water Lab1,Lab2 and Lab3,have been calibrated using international standard water samples VSMOW2 and SLAP2 in the past 4 years.All of the obtained^(17)O-excess values showed high precision(<10 per meg,1 SD).The calibration results of international standard water samples from 2019 to 2022 and laboratory standard water samples from 2019 to 2021 were consistent within the error range.And the change of trioxygen isotope composition could be detected after reconfiguration of Lab standard water in 2022.This method has long-term stability and can provide technical support for the determination of triple oxygen isotope composition in different water samples.