scholarly journals OPERATION OF THE DISTILLATION METHOD FOR THE DETERMINATION OF SODIUM OXIDE IN NaK DURING THE CALIBRATION OF A PLUG INDICATOR

1957 ◽  
Author(s):  
R.D. Peak
Keyword(s):  
Sodium Oxide ◽  
Distillation Method

An Automated Procedure for the Determination of Ammonia in Tobacco

1972 ◽  
Vol 6 (4) ◽  
Author(s):  
P.F. Collins ◽  
W.W. Lawrence ◽  
J.F. Williams
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Distillation Method ◽  
Relative Standard ◽  
Tobacco Sample ◽  
Automated Determination

AbstractA procedure for the automated determination of ammonia in tobacco has been developed. Ammonia is extracted from the ground tobacco sample with water and is determined with a Technicon Auto Analyser system which employs separation of the ammonia through volatilization followed by colourimetry using the phenate-hypochlorite reaction. The procedure has been applied to a variety of tobaccos containing from 0.02 to 0.5 % ammonia with an overall relative standard deviation of 2 %. The accuracy of the procedure as judged by recovery tests and by comparison to a manual distillation method is considered adequate

Nicotine Analysis of Commercial Tobacco Products

1988 ◽  
Vol 71 (6) ◽  
pp. 1110-1115
Author(s):  
Alfred M Gottscho ◽  
Jeen-Lee Lin ◽  
William N Duck ◽  
Thomas A Losty
Keyword(s):  
Sample Preparation ◽  
Distillation Method ◽  
Tobacco Products ◽  
Standard Methods ◽  
Total Alkaloids ◽  
Alternative Procedures

Abstract The use of AOAC standard methods for the determination of nicotine in commercial tobacco products is shown to be inappropriate. The methods do not provide for suitable sample preparation of these products for the analysis and, in addition, they yield high results. Evidence is presented that the nicotine or total alkaloids measured includes artifact nicotine. The distillation method was developed at a time when the complex alkaloid chemistry of tobacco was unknown, and does not take into consideration the possible contribution of substances in tobacco capable of contributing falsely to the result. The Cundiff-Markunas method, developed more recently, also fails to account for this effect—probably because it was designed to produce results matching those of the distillation method. Replacement of the standard methods is proposed and some alternative procedures are suggested

Partition Column for Determination of Glyceryl Trinitrate in Tablets

1964 ◽  
Vol 47 (3) ◽  
pp. 471-473
Author(s):  
John R Hohmaxn ◽  
Joseph Levine
Keyword(s):  
Acetic Acid ◽  
Glyceryl Trinitrate ◽  
Chromatographic Separation ◽  
Distillation Method ◽  
Sublingual Glyceryl Trinitrate ◽  
Acid Reagent ◽  
Quantitative Results

Abstract A method using column partition chromatographic separation has been developed for the determination of nitroglycerin in soluble, sublingual glyceryl trinitrate tablets. A mixture of the phenoldisulfonic acid reagent and acetic acid is used to extract the nitroglycerin from the eluate. Quantitative results are obtained by measuring the color of the nitrated phenoldisulfonic acid that is formed. Results by the method are in agreement with those obtained by the USP distillation method and an infrared assay.

Sweep Co-Distillation Cleanup of Fortified Edible Oils for Determination of Organophosphate and Chlorinated Hydrocarbon Pesticides

1967 ◽  
Vol 50 (3) ◽  
pp. 605-615
Author(s):  
R W Storherr ◽  
Edward J Murray ◽  
I Klein ◽  
Lynn A Rosenberg
Keyword(s):  
Fruits And Vegetables ◽  
Edible Oils ◽  
Rapid Determination ◽  
Organophosphate Pesticides ◽  
Nitrogen Flow ◽  
Distillation Method ◽  
Chlorinated Pesticides ◽  
Chlorinated Hydrocarbon ◽  
The Individual

Abstract The technique of sweep co-distillation developed for organophosphate pesticides in fruits and vegetables was expanded for application to organophosphate and chlorinated hydrocarbon pesticides in edible oils. A modified longer and wider Storherr tube and heating assembly was used in this work and 3 mm diameter glass beads replaced the glass wool packing used in crop work. The work on oils was performed at 248 ± 3°C with a nitrogen flow of 600 ml/min and injection of a sweeping solvent every 3 minutes for 30 minutes. Phosphate pesticides were analyzed by GLC with a potassium thermionic detector and chlorinated pesticides were determined by ECGLC, after a micro Florisil column was used to eliminate extraneous peaks. Recoveries of ten phosphate pesticides from nine edible oils ranged from 74 to 100% at fortification levels of 0.04 to 6.25 ppm; average recoveries for the individual pesticides were 90—99%. Average recoveries for the chlorinated pesticides ranged from a low of 75% for Tedion to a high of 98% for endrin and dieldrin. Sensitivity of 0.01 is readily obtainable for compounds such as parathion and heptachlor cpoxide. The sweep co-distillation method is suitable for the rapid determination of the 14 chlorinated and 10 organophosphate pesticides tested in edible oils

Determination of Formaldehyde in Water-Borne Coatings by HPLC

2017 ◽  
Vol 726 ◽  
pp. 355-359 ◽  
Author(s):  
Ming Yu Wang ◽  
Zhong Bao Guo ◽  
Hong Yan Guan ◽  
Man Li
Keyword(s):  
Extraction Method ◽  
High Performance ◽  
Steam Distillation ◽  
High Performance Liquid Chromatographic ◽  
Distillation Method ◽  
Efficient Extraction ◽  
Liquid Chromatographic ◽  
Good Linear Correlation ◽  
Water Borne

A method for determination of formaldehyde in water-borne coatings by high-performance liquid chromatographic was proposed. Ultrasonic water extraction method was used instead of the traditional steam distillation method can be more rapid and efficient extraction of target, filtered and derivatived with DNPH. The extract was separated by C18 column with an elution composed of acetonitrile and water, and detected at 352nm. The detection limit was 0.1mg/L. The method showed good linear correlation, R2 was 0.9997 at the range of 0.1mg/L ~ 20 mg/L. Recovery was 95% ～105%. This method is simple, effective and sensitive.

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