Atomic Absorption Spectroscopic Determination of Dimethylpolysiloxane in Juices and Beer

1982 ◽  
Vol 65 (1) ◽  
pp. 148-150
Author(s):  
Jurgen L Kacprzak
Keyword(s):  
Nitrous Oxide ◽  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Soxhlet Extraction ◽  
Magnesium Silicate ◽  
Chloroform Extract ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Porous Magnesium

Abstract A method is described for determining dimethylpolysiloxane (DMPS), an antifoaming agent, in juices and beer. The method involves adsorbing the beverage onto Florisil (an activated porous magnesium silicate), drying, and Soxhlet extraction with chloroform. The chloroform extract is evaporated to dryness and DMPS is determined in the residue after dissolution with methyl isobutyl ketone and aspiration into a nitrous oxide-acetylene flame of an atomic absorption spectrophotometer. The detection limit is about 0.2 ppm.

Collaborative Study of the Determination of Boric Acid in Foods by Atomic Absorption Spectrophotometry

1972 ◽  
Vol 55 (4) ◽  
pp. 890-891
Author(s):  
Walter Holak
Keyword(s):  
Nitrous Oxide ◽  
Boric Acid ◽  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Collaborative Study ◽  
Atomic Absorption Spectrophotometry ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Absorption Spectrophotometry

Caviar and dried apricots containing a known amount of added boric acid were subjected to a collaborative study. The samples were digested with sulfuric-nitric acid under reflux; the boron was then complexed with 2-ethyl-1,3-hexanediol and extracted into methyl isobutyl ketone. Boron in the organic phase was determined by atomic absorption, using a nitrous oxide-acetylene flame. The recoveries were satisfactory: 103, 95, and 93% for 300, 1000, and 1600 μg boron/g apricots and 95, 90, and 92% for the corresponding caviar samples. The method has been adopted as official first action.

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.

Atomic Absorption Determination of Boron in Foods

1971 ◽  
Vol 54 (5) ◽  
pp. 1138-1139
Author(s):  
Walter Holak
Keyword(s):  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Food Samples ◽  
Organic Layer ◽  
Absorption Method ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Atomic Absorption Determination ◽  
Absorption Determination

Abstract A rapid and specific atomic absorption method is presented for the determination of boron as boric acid, which is usually added to foods at the 0.5% level. The sample is digested with sulfuric acid, nitric acid, and 30% hydrogen peroxide. Boron is then chelated with 2-ethyl-l,3-hexanediol and extracted into methyl isobutyl ketone. Absorption due to boron is measured in the organic layer and compared to standards similarly extracted and measured. Recovery studies with food samples indicate that the method may be applicable to a wide variety of foods.

Atomic Absorption Spectrophotometric Determination of Boron in Plants

1970 ◽  
Vol 53 (4) ◽  
pp. 682-685
Author(s):  
James R Melton ◽  
William L Hoover ◽  
Peggy A Howard ◽  
Jo Lynn Ayers
Keyword(s):  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Plant Sample ◽  
Organic Layer ◽  
Absorption Method ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Plant Materials ◽  
Dry Ashing

Abstract An atomic absorption method is proposed by which boron can be analyzed in plant materials at concentrations of 3 μg/g o r greater. With the exception of fluorides, no interferences were observed. Results obtained from the proposed method compared favorably with AOAC 6.073. Recoveries of boron ranged from 93 to 107%. This method involves dry ashing the plant sample and treating the ash with 5N HCl. Boron is extracted from this solution into an organic phase of 2-ethyl-l,3-hexanediol in methyl isobutyl ketone. The organic layer is aspirated into the flame without decantation for the determination by atomic absorption.

scholarly journals Determination of Transition Metals in Cigarette Smoke Condensate by Solvent Extraction and Atomic Absorption Spectroscopy

1974 ◽  
Vol 7 (5) ◽  
Author(s):  
G.P. Morie ◽  
P.E. Morrisett
Keyword(s):  
Particulate Matter ◽  
Transition Metals ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Methyl Isobutyl Ketone ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Total Particulate Matter

AbstractA method for the determination of trace transition metals in cigarette smoke is described. The smoke particulate matter is digested in nitric acid, the acid is neutralized, and metal ions are complexed with ammonium 1-pyrrolidinecarbodithioate and extracted with methyl isobutyl ketone. The metals are then determined in the organic solvent by atomic absorption spectroscopy. The sensitivity of the method is enhanced by the use of the methyl isobutyl ketone extraction. The method was evaluated for the determination of manganese, copper, iron, and zinc in the total particulate matter of smoke from University of Kentucky reference cigarettes and from commercial cigarettes. The amounts of these metals found in the smoke of a typical commercial filter cigarette are: 0.04 µg Mn, 0.10 µg Cu, 0.8 µg Fe, and 0.6 µg Zn. The method was used to show that cellulose acetate cigarette filters remove about the same percentage of metals as total particulate matter from smoke

Sign in / Sign up

Export Citation Format

Share Document