Determination of Small Amounts of Ethyl Ether in Ethyl Alcohol

1948 ◽  
Vol 20 (7) ◽  
pp. 651-652 ◽  
Author(s):  
W. E. Shaefer
Keyword(s):  
Ethyl Alcohol ◽  
Ethyl Ether

Determination of Ethyl Alcohol in Saliva

1936 ◽  
Vol 34 (4) ◽  
pp. 504-505 ◽  
Author(s):  
J. C. Abels
Keyword(s):  
Ethyl Alcohol

GLC Determination of Quinaldine Residue in Fish

1970 ◽  
Vol 53 (1) ◽  
pp. 20-23
Author(s):  
John L Allen ◽  
Joe B Sills
Keyword(s):  
Gas Chromatography ◽  
Sulfuric Acid ◽  
Ethyl Ether ◽  
Fish Tissues ◽  
Flame Ionization ◽  
Muscle Tissues

Abstract A procedure for the determination of quinaldine residue in various fish tissues is described. Homogenized tissues are extracted with hexane-ethyl ether, the extracts are concentrated by partitioning through 0.1N sulfuric acid, and the residues are measured by alkali flame ionization gas chromatography. Muscle tissues containing from 0.01 to 10.0 ppm quinaldine were successfully analyzed with recoveries from 75 to 100%.

Instability of Propyl Lactate Prepared by Boron Trifluoride-Catalyzed Esterification of Lactic Acid

1972 ◽  
Vol 55 (4) ◽  
pp. 888-889
Author(s):  
Walter F Staruszkiewicz ◽  
John F Bond
Keyword(s):  
Lactic Acid ◽  
Ethyl Ether ◽  
Boron Trifluoride ◽  
Chromatographic Method ◽  
Published Data ◽  
Chromatographic System ◽  
Propyl Esters ◽  
Gas Chromatographic Method ◽  
Hydrolysis Of

The official first action gas chromatographic method for the determination of lactic, β-hydroxyhutyric, and succinic acids, 17.034–17.038, requires the formation of their propyl esters with boron trifluoride-1-propanol and extraction of the esters into an organic solvent prior to chromatography. Previously published data showed that the solutions of propyl esters were stable for as long as 4 weeks when they were extracted into chloroform and stored at 40°F. However, when ethyl ether is substituted for chloroform, propyl lactate is no longer stable during storage. The ether apparently extracts some unreacted boron trifluoride which eventually causes the hydrolysis of propyl lactate. The propyl esters of β-hydroxybutyric, levulinic, and succinic acids were stable in ether as well as in chloroform. The method has been revised to include the use of ethyl ether, if required by the gas chromatographic system, and to specify analysis of the ether solutions within 24 hr of esterification.

Liquid Chromatographic Determination of Spiramycin Residues in Chicken Tissues

1986 ◽  
Vol 69 (4) ◽  
pp. 644-646
Author(s):  
Tomoko Nagata ◽  
Masanobu Saeki
Keyword(s):  
Detection Limit ◽  
Ethyl Ether ◽  
Chromatographic Determination ◽  
Chicken Tissues ◽  
Chicken Muscles ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for determination of spiramycin residues in chicken muscles. The drug is extracted from muscles with acetonitrile, the extract is concentrated to 3-4 mL and rinsed with n-hexane followed by ethyl ether, and the drug is extracted with chloroform. LC analysis is carried out on a Zorbax BP-C8 column, and spiramycin is detected spectrophotometrically at 231 nm. Recoveries of spiramycin added to chicken muscles at 0.2 and 0.1 ppm were 93.9 and 89.0%, respectively. The detection limit was 5 ng for spiramycin standard, and 0.05 ppm in chicken muscles.

Liquid Chromatographic Determination of Polycyclic Aromatic Hydrocarbons in Fish and Shellfish

1985 ◽  
Vol 68 (5) ◽  
pp. 945-949
Author(s):  
Keigo Takatsuki ◽  
Shigeru Suzuki ◽  
Nobutoshi Sato ◽  
Isamu Ushizawa
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Silica Gel ◽  
Aromatic Hydrocarbons ◽  
Ethyl Ether ◽  
Analytical Method ◽  
Alkaline Digestion ◽  
Polycyclic Aromatic ◽  
Liquid Chromatographic ◽  
Fish And Shellfish

Abstract A simple and accurate analytical method for determination of polycyclic aromatic hydrocarbons (PAHs) in fish and shellfish is presented, which is considered to be useful for routine analyses and for screening purposes. The procedure involves alkaline digestion, extraction with n-hexane, silica gel column chromatography, and liquid chromatographic (LC) determination with fluorometric detection. During development of the analytical method for determination of PAHs, it was found that benzo[a]pyrene, a representative PAH, was decomposed easily by the analytical procedure, and this tendency was investigated for the experimental conditions used. Benzo[a]pyrene was decomposed by the coexistence of alkaline conditions, light, and oxygen; by peroxides in aged ethyl ether; and by oxygen when adsorbed on silica gel. Thus, to obtain good recoveries and precise analytical results, these decomposition conditions must be avoided. The following precautions are recommended: protection from light through all analytical steps; addition of Na2S to alkaline digestion mixture as an antioxidant; complete removal of peroxides from ethyl ether just before use; quick column chromatography on silica gel; and prevention of air from contact with adsorbent. When this simple method was applied to fish and shellfish samples, very good recoveries of PAHs from fortified fish samples were obtained, and no serious interferences were observed in fish and shellfish extracts

Volumetric Determination of Malathion, Using Dichlorofluorescein as Indicator

1976 ◽  
Vol 59 (1) ◽  
pp. 216-218
Author(s):  
Miguel Siquiroff ◽  
Ricardo Pollero ◽  
Rodolfo Goyena
Keyword(s):  
Standard Deviation ◽  
Petroleum Ether ◽  
Silver Nitrate ◽  
Ethyl Ether ◽  
Colorimetric Method ◽  
Florisil Column ◽  
Average Recovery ◽  
Florisil Column Chromatography ◽  
Volumetric Determination

Abstract A method has been developed which is based on alkali cleavage of malathion and volumetric determination of the resulting dimethylphosphorodithioate with silver nitrate, using dichlorofluorescein as the indicator. Pure malathion standards were analyzed by the proposed method, yielding a standard deviation of 0.27. Four typical malathion formulations containing talc, wheat flour, and anionic and nonionic emulsifiers were analyzed by both the proposed method and the former official first action colorimetric method with comparable results. Potential interferences from surfactants currently employed in liquid formulations are avoided by the use of Florisil column chromatography. Malathion is eluted from the column with petroleum ether-ethyl ether with an average recovery of 92.5%.

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