Cellulose acetone extraction method

The first recommended soil method for oxime carbamates is the method of Honing et al. by HPLC/MS. The LOQ of the method, specifically for aldicarb, methomyl, and oxamyl, is 0.05mgkg. Soil (lOg) is Soxhlet extracted for 16h with acetone-dichloromethane (1 1) using double-thickness cellulose extraction thimbles (80 X 22-mm i.d.). Prior to extraction, the Soxhlet system and the thimbles are cleaned for 14 h by refluxing with methanol. The extracts are removed and concentrated nearly to dryness in a rotary evaporator operating at 35 °C evaporation to dryness... 

Spengler and Jumar [90] used a spectrophotometric method and thin layer chromatography to determine carbamate and urea herbicide residues in sediments. The sample is extracted with acetone, the extract is evaporated in vacuo at 40°C and the residue is hydrolysed with sulphuric acid. The solution is made alkaline with 15% aqueous sodium hydroxide and the liberated aniline (or substituted aniline) is steam distilled and collected in hydrochloric acid. The amine is diazotized and coupled with thymol, the solution is cleaned up on a column of MN 2100 cellulose power and the azo-dye is determined spectrophotometrically at 440nm (465nm for the dye derived from 3-chloro- or 3.4-dichloroaniline) with correction for the extinction of a reagent blank. 

Food dyes are extracted from foods by using adsorbents such as wool fibers, powdered polyamide, cellulose exchange resins, or RP cartridges (Sep-pak Cis), which is the method of choice for a fast and easy cleanup. After desorption of the colorants and filtration, the solution is analyzed by either ion-pair or reversed-phase LC. Ion-pair LC uses water acetone mixtures (80 20) with tetrabutylammonium chloride added as ion-pair agent and Cig or Cg columns. As for RPLC, a combination of phosphate buffer methanol, water acetonitrile, and methanokacetone are commonly used. Gradients are used to allow the separation of the different classes of... 

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