REMOVAL OF NITRIC ACID FROM CONCENTRATED PHOSPHORIC ACID BY EXTRACTION WITH METHYL ISOBUTYL KETONE IN AROMATIC DILUENTS

1988 ◽  
Vol 6 (6) ◽  
pp. 993-1006 ◽  
Author(s):  
Yu Zhang ◽  
Mamoun Muhammed
Keyword(s):  
Nitric Acid ◽  
Phosphoric Acid ◽  
Methyl Isobutyl Ketone ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone

Collaborative Study of the Determination of Boric Acid in Caviar by Emission Spectroscopy

1975 ◽  
Vol 58 (2) ◽  
pp. 293-296
Author(s):  
Vincent Franco ◽  
Walter Holak
Keyword(s):  
Nitric Acid ◽  
Boric Acid ◽  
Boron Oxide ◽  
Emission Spectroscopy ◽  
Methyl Isobutyl Ketone ◽  
Collaborative Study ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
The Mean

Abstract Caviar samples were spiked at the 0.1 and 0.2% levels and digested with nitric acid in a closed Teflon-lined digestion vessel to prevent volatility losses. The boron was complexed with 2-ethyl-l,3-hexanediol and extracted into methyl isobutyl ketone. The emission of the boron oxide band was measured in a nitrous oxidehydrogen flame. The mean recoveries at the 0.1 and 0.2% levels for 6 collaborators were 95.7 and 97.1%, respectively. The method has been adopted as official first action.

Atomic Absorption Spectrophotometnc Determination of Chromium in Foods

1986 ◽  
Vol 69 (5) ◽  
pp. 876-879
Author(s):  
Rosaura Farré ◽  
M Jesús Lagarda ◽  
Rosa Montoro
Keyword(s):  
Organic Matter ◽  
Nitric Acid ◽  
Reference Material ◽  
Standard Reference Material ◽  
Methyl Isobutyl Ketone ◽  
Food Samples ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Quantitation Limit

Abstract A method is reported for determination of chromium in foodstuffs. Organic matter is digested with nitric acid, followed by oxidation to Cr(VI) and extraction with methyl isobutyl ketone (MIBK) after HC1 addition. Chromium determinations are performed by flame absorption spectroscopy. Absence of interferences is verified and recovery tests are performed on food samples. Quantitation limit (3.8 ng/mL), accuracy (NBS Standard Reference Material 1573 Tomato Leaves, 4500 ± 500 ng/g, found 3860 ± 409 ng/g), and precision (CV for vegetable matrix = 9.05%, CV for animal matrix = 14.95%) of the procedure are evaluated.

Determination of Some Nitrophenols by Atomic Absorption Spectrometry (AAS) After Extraction of Ionic Associates Involving the Bipyridylocopper(II) or Phenanthrolinocopper(II) Complex

1994 ◽  
Vol 59 (10) ◽  
pp. 2227-2234 ◽  
Author(s):  
Václav Stužka ◽  
Jaromír Souček
Keyword(s):  
Molecular Weight ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Absorption Spectrometry ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Indirect Determination ◽  
Ionic Associates

A new method has been developed for the indirect determination of nitroso- and nitrophenols by atomic absorption spectrometry (AAS) after extraction of ionic associates involving bipyridylocopper(II) (CuDP) or phenanthrolinocopper(II) (CuPH) complexes. Nitrobenzene and methyl isobutyl ketone appeared to be suitable for the extraction. It was possible to determine several tenths to hundredths of a milligram of nitrophenol in a litre. Extractable associates with CuDP and CuPH are formed by phenols possessing two substituents or by higher molecular weight phenols such as naphthol or hydroxyquinoline. Monosubstituted phenols fail to form associates of this kind.

Ce and Ca/Nb doped Pd-mesocellular foam catalysts for gas-phase conversion of acetone to methyl isobutyl ketone

2021 ◽  
pp. 111169
Author(s):  
Kalina Grzelak ◽  
Rouzana Pulikkal Thumbayil ◽  
Søren Kegnæs ◽  
Maciej Trejda ◽  
Anders Riisager
Keyword(s):  
Gas Phase ◽  
Methyl Isobutyl Ketone ◽  
Phase Conversion ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone
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