Characterization of dissolved organic matter in deep groundwater by simple analytical methods applicable for small sample volumes

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  • 少量試料に適用可能な簡易分析法に基づく深部地下水中の溶存有機物の特性評価
  • 少量試料に適用可能な簡易分析法に基づく深部地下水中の溶存有機物の特性
  • ショウリョウ シリョウ ニ テキヨウ カノウ ナ カンイ ブンセキホウ ニ モトズク シンブチ カスイチュウ ノ ヨウゾンユウキブツ ノ トクセイ

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Abstract

<p>　The characterization of humic substances in groundwater is usually performed using isolated humic substances from a large volume of groundwater. However, the isolation process requires extensive time and effort, and is not feasible for small-volume samples. In this study, characterization methods available for small-volume (approximately 1 L) samples were applied to groundwater and surface water in the Horonobe area, Hokkaido. The methods, 3D-fluorescence analysis, gel permeation chromatography, and ion chromatography, were used to characterize dissolved organic matter (DOM) in the samples, including humic substances. The results indicated that the 3D-fluorescence spectrum obtained from a small volume of groundwater was similar to that obtained from isolated humic substances and showed little variation with depth. However, the peak position in surface water was different from that in groundwater. Gel permeation chromatography showed that the DOM in groundwater mainly consisted of humic substances with a molecular weight of approximately 1200–2000 Da, and that the molecular weight decreased with depth. These results are consistent with the characteristics of isolated humic substances. Ion chromatography revealed that organic matter with low molecular weight was a minor component of DOM in the groundwater, which is consistent with gel permeation chromatography results. These results indicate that the methods applied in this study are useful for the characterization of DOM in groundwater using small sample volume.</p>

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