Remarks of Water Isotope Measurement of Small Samples with Analyzer Based on Wavelength-Scanned Cavity Ring-Down Spectroscopy (WS-CRDS)

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  • 波長スキャンキャビティリングダウン分光法による水同位体比測定装置を用いた微量サンプル測定について
  • ハチョウ スキャンキャビティリングダウン ブンコウホウ ニ ヨル ミズ ドウイタイヒ ソクテイ ソウチ オ モチイタ ビリョウ サンプル ソクテイ ニ ツイテ

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 The accuracy and remarks of water isotope measurement of small samples with analyzer based on Wavelength-Scanned Cavity Ring-Down Spectroscopy (WS-CRDS) are discussed. Measurements were conducted with 2.0 mLvials. The minimum sample volume to obtain the measured values was 0.3 mL. However, the measured values were larger than the true values by the effects of evaporation of samples within the vials if the sample volume was small.Effects of evaporation differed between the samples themselves, which have different stable isotope ratio, but also between δ18O and δD. The salient advantage of this type of analyzer is that the sample consumption is extremely small. However, to conduct an accurate analysis, the required minimal sample volume is 1.0 mL. The maximal volume is up to about 1.7 mL.

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