書誌事項
- タイトル別名
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- Determination of urea in natural water by an improved Newell method
- スイチュウ ニョウソ テイリョウホウ ノ カイリョウホウ ノ ケントウ ノート
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The method for determination of urea in sea water proposed by Newell et al. was re-examined in detail and partly modified. The following method is recommended.<BR>To 25 mlof a sample solution are added 3 g of sodium chloride for fresh water or 2 g for sea water (Fig. 1), 3 mlof concentrated sulfuric acid and 1 mlof the mixed reagent (4.0 g of diacetyl monoxime, 0.05 g of semicarbazide hydrochloride and 15 g of MnCl24H2O in 200 mlof water). The solution is allowed to stand for 90 min at 70°C (Fig. 2). After cooling in running water, the absorbance is measured at 520 mμ against water using a 5-cm cell. The blank is measured by the same procedure with distilled water for fresh water or artificial sea water for sea water. The common ions in natural water and nitrogen-containing compounds do not interfere as seen in Table I. Although citrulline, which is produced by decomposition of arginine, gives a positive error, it is unlikely that such amount of citrulline exsists in natural water. The molar extinction coefficient for urea is 22000. The relative standard deviations were 3 and 5% at the concentration of 86 and 43 μg urea/l, respectively.
収録刊行物
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- 分析化学
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分析化学 21 (10), 1387-1389, 1972
公益社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204661680384
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- NII論文ID
- 130000942679
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- NII書誌ID
- AN00222633
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- NDL書誌ID
- 7640919
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- ISSN
- 05251931
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可