Download Analysis of Surfactants by Thomas M. Schmitt PDF

By Thomas M. Schmitt

A textual content and reference giving a pragmatic account of equipment the decision and comprehension of commercially vital person surfactants, in addition to these in compounds. Describes the make-up and structural drawings for an array of surfactants, reports thoughts for picking out them within the surroundings, and extra.

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Add about 60 mL MeOH to the titration vessel and allow the moisture in the solvent to be titrated. Standardize the titrant by titrating 2-3 drops of water weighed by difference from a dropping bottle, calculating the calibration factor from three determinations. Add the sample to the titration vessel from a weighing bottle, dropper bottle, or disposable syringe, weighing by difference in each case. 3 g is appropriate. Problem samples, such as very viscous materials, may be dissolved in 10 mL THF before introduction.

The petroleum ether phase is dried by addition of 1 g sodium sulfate, transferred to yet another test tube, and evaporated to a small volume in a water bath at 60-70°C. This solution is then diluted 1:1 with very pure acetone and analyzed by gas chromatography. 0°C/min, with FID detection. Peaks are identified by use of standard alkylbenzenes of known composition, with quantification by area percent. (c) Liquid chromatography determination of alky I chain distribution. Alkylbenzenesulfonates can be separated according to the length and degree of branching of the alkyl chain by paired-ion HPLC.

Alkylbenzenesulfonates can be separated according to the length and degree of branching of the alkyl chain by paired-ion HPLC. Changes can be made in the pH, ionic strength, and solvent ratio of the mobile phase to control the separation. Procedure: LAS Characterization by Paired-Ion HPLC (12) A sample of 50-100 mL is deposited on a 3-mL silica SPE column (J. T. Baker) conditioned in CHC13. 5-mL aliquots of CHC13. 5-mL methanol washes. The methanol solution is evaporated to dryness to expel CHC13, and the residue is redissolved in water or methanol.

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