Maselli Olivia J, Fritzsche Diedrich, Layman Lawrence, McConnell Joseph R, Meyer Hanno
a Desert Research Institute , Reno , NV , USA ;
Isotopes Environ Health Stud. 2013;49(3):387-98. doi: 10.1080/10256016.2013.781598. Epub 2013 May 29.
We present a detailed comparison between subsequent versions of commercially available wavelength-scanned cavity ring-down water isotope analysers (L2120-i and L2130-i, Picarro Inc.). The analysers are used in parallel in a continuous mode by adaption of a low-volume flash evaporation module. Application of the analysers to ice-core analysis is assessed by comparison between continuous water isotope measurements of a glacial ice-core from Severnaya Zemlya with discrete isotope-ratio mass spectrometry measurements performed on parallel samples from the same ice-core. The great advances between instrument versions, particularly in the measurement of δ(2)H, allow the continuous technique to achieve the same high level of accuracy and precision obtained using traditional isotope spectrometry techniques in a fraction of the experiment time. However, when applied to continuous ice-core measurements, increased integration times result in a compromise of the achievable depth resolution of the ice-core records.
我们对商用波长扫描腔衰荡水同位素分析仪（L2120-i和L2130-i，Picarro公司）的后续版本进行了详细比较。通过采用小体积闪蒸模块，这些分析仪以连续模式并行使用。通过比较来自北地群岛的冰川冰芯的连续水同位素测量结果与对同一冰芯的平行样本进行的离散同位素比率质谱测量结果，评估了这些分析仪在冰芯分析中的应用。仪器版本之间的巨大进步，特别是在δ(2)H测量方面，使得连续技术能够在实验时间的一小部分内达到与传统同位素光谱技术相同的高精度和高准确度。然而，当应用于连续冰芯测量时，积分时间的增加会导致冰芯记录可实现的深度分辨率下降。
