scholarly journals A rapid colorimetric solvent-extraction procedure for the determination of cyanide in gold-mill effluents and receiving waters

1970 ◽  
Author(s):  
D J Barkley ◽  
J C Ingles
Keyword(s):  
Solvent Extraction ◽  
Extraction Procedure ◽  
Receiving Waters

Examination of Conditions for the Determination of Carbamate Pesticides in Soils

1992 ◽  
Vol 57 (8) ◽  
pp. 1632-1638 ◽  
Author(s):  
Věra Tatarkovičová ◽  
Zdeněk Stránský
Keyword(s):  
Activated Carbon ◽  
Solvent Extraction ◽  
Soil Type ◽  
Extraction Procedure ◽  
Purification Procedure ◽  
Factors Affecting ◽  
Carbamate Pesticides ◽  
Rp Hplc ◽  
Extracting Solvent

The procedure for the determination of carbamate pesticides in soil was optimized. The following factors affecting the final results were investigated: extracting solvent, extraction procedure, extract purification procedure, and soil type. Triple extraction with acetone and purification of the extract on a two-stage purification column containing an activated carbon-silica gel 1+1 mixture were found optimal. The extracts after treatment were analyzed by RP-HPLC with UV detection. The method developed allows carbamate pesticides in soil to be determined at concentrations in excess of 30 μg kg-1.

Gas-Liquid Chromatographic Determination of Dioxathion and Quintiofos in Organophosphorus Dip Washes

1980 ◽  
Vol 63 (1) ◽  
pp. 33-36
Author(s):  
Molly I Keating
Keyword(s):  
Solvent Extraction ◽  
Extraction Procedure ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Phosphorus Compounds ◽  
Ionization Detector ◽  
Liquid Chromatographic Determination ◽  
Gasliquid Chromatography ◽  
Liquid Chromatographic

Abstract A rapid method for the analysis of dip washes is described which eliminates the usual solvent extraction procedure. The dip wash is initially diluted with acetone and then with petroleum ether. The diluted dip wash is analyzed by gasliquid chromatography, using an alkali ionization detector sensitive to phosphorus compounds. The method was applied to the determination of dioxathion (2,3-ρ-dioxanedithiol S,S-bis(O,O-diethyl phosphorodithioate)), and quintiofos (O-ethyl O-8-quinolyl phenylphosphonothioate) dip washes. Average recoveries from fouled dip washes were 100 and 104%. GLC of these compounds with an internal standard is described, which improves the precision of the method to ±2%.

Simplified Manual Micromethod for Determination of Serum Triglycerides

1971 ◽  
Vol 17 (6) ◽  
pp. 529-534 ◽  
Author(s):  
Felix G Soloni
Keyword(s):  
Solvent Extraction ◽  
Extraction Procedure ◽  
Serum Triglycerides ◽  
Adsorption Step ◽  
Color Development

Abstract This rapid, simplified assay for serum triglycerides is based on the use of a more effective solvent extraction procedure, ethoxide transesterification, and color development with acetylacetone. No phospholipid adsorption step is necessary. The procedure requires less than 0.2 ml of serum, no expensive or elaborate apparatus, and 5 to 10 values can be obtained per hour, with better precision than with most existing methods. Recovery averaged 99.9%. There are practically no interferences. Results correlated excellently with those obtained by the classical Carlson-Wadström method.

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