硫酸過氯酸分解法的再檢討(關於氮的損失)
Other Title
Note on the Sulfuric Perchloric Acid Digestion for Nitrogen Determination of Plant Sample (About the Loss of Nitrogen)
Journal
農業研究
Journal Volume
17
Journal Issue
1
Start Page
19
End Page
21
Date Issued
1968-03-05
Date
1968-03-05
Author(s)
李蘭帝
L.T. Li
Abstract
筆者在「大量植物樣本氮磷鉀的迅速測定法」中曾介紹過使用硫酸過氯酸分解法以測定氮素之方法。該法在屢次試驗中充分表示了與標準Kjeldahl氏法一致的結果。事後筆者再進一步使用了數種純粹有機氮化合物做試料，仍與標準Kjeldahl氏法做比較。結果出乎意料的該法比Kjeldahl氏法得了較高的測定值。筆者又再檢討予備分解時間與過氯酸的用量問題，結果發現如過氯酸使用不當時會引起氮的損失。綜合上面的結果筆者覺得有把詳細的情形報告給大家的必要，以供大家參考並希指正。
Plant sample is digested with sulfuric acid only, which is called predigestion. After predigestion, perchloric acid is added to complete the digestion. The end of predigestion is indicated by 1) solution of the sample, 2) color change from black to dark brown, 3) small amount of fume etc. Perchloric acid in excess amount caurses loss of nitrogen. Preliminary test is necessary for the beginner. Perchloric acid treatment in devided dosage is also helpful to keep digestion from excess of oxidant.
Publisher
農業試驗所
Type
journal article
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