## Abstract The determination of silicone in oil was based upon conversion of the oil into water‐soluble form (Na/K‐Soap) in a teflon tube, extraction of the water‐insoluble, solvent‐soluble silicones with petroleum ether, and determination of the silicones in some suitable organic solvent by nonfl
Determination of trace molybdenum in vegetable and food samples by spectrophotometry withp-carboxyphenylfluorone
✍ Scribed by Li Zaijun; Pan Jiaomai; Tang Jian
- Publisher
- Springer
- Year
- 2002
- Tongue
- English
- Weight
- 231 KB
- Volume
- 374
- Category
- Article
- ISSN
- 1618-2650
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A sensitive visual colorimetric method has been developed for the semiquantitative field determination of trace molybdenum. The molybdenum-catalyzed oxidation of ascorbic acid at pH 3.2 in the presence of ophenylenediamine was used as the indicator reaction, which produces yellow quinoxaline derivat
Two spectrophotometric methods have been described for determining Tartrazine and Ponceau-4R in binary mixtures. These methods permit the simultaneous determination of these food colorants in various commercially available food samples which contain saccharose and citric acid. Ratio spectra first-or
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