環境試料中の微量カルボン酸の安定性と保存法

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  • Special Articles: Environmental Sciences and Analytical Chemistry. Stability of trace amounts of carboxylic acids in environmental samples and their storage method.
  • 特集　環境科学と分析化学　環境試料中の微量カルボン酸の安定性と保存法
  • カンキョウ シリョウチュウ ノ ビリョウ カルボンサン ノ アンテイセイ ト

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Trace amounts of carboxylic acids in environmental samples are strongly related to the acidification of environmental waters such as rain and snow. In the analysis of environmental trace carboxylic acids, it is very important to prepare reliable standard solutions of an extremely dilute concentration comparable to actual samples. Furthermore, it is extremely important to be able to store environmental samples in a stable condition until analysis. As the amount of trace carboxylic acids in environmental waters decreases greatly during storage, we have investigated precisely methods of storage of carboxylic acids in environmental samples. As a result, it is confirmed that carboxylic acids, with the exception of lactic acid, are stabilized enough for at least 6 months by the addition of hydrochloric acid to adjust the pH to below 2 in a refrigerator. Lactic acid can be only stored for 3 months under the same conditions. As concentrations of carboxylic acids in environmental waters are generally lower than those we investigated here, we propose that carboxylic acids in environmental waters should be determined within one month after sampling even though environmental samples can be stored under these conditions for a longer term.

収録刊行物

  • 分析化学

    分析化学 43 (11), 995-999, 1994

    公益社団法人 日本分析化学会

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