New PDF release: Analysis Of Surfactant
By Thomas M. Schmitt
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Extra info for Analysis Of Surfactant
This procedure is similar to that described under the analysis of ethoxylated nonionic surfactants. The alkyl iodides from cleavage may also be determined by HPLC (72). An alternative approach requires the decomposition of the sulfate and ethoxy groups with the mixed anhydrides of paratoluenesulfonic and acetic acid, followed by GC determination of the alcohol acetates (73). Characterization of Anionic Surfactants 29 High temperature gas chromatography may be performed on the trimethylsilyl derivatives of the AE resulting from acid hydrolysis of AES.
The ASTM procedure is summarized below. The ISO procedure differs in that the starting sample has already been extracted free of neutral oil, the solvent for extraction after hydrolysis is ethyl ether, and 1 M HC1 rather than ethanol/water is used to wash the extract (60). Procedure (7) Weigh a sample of 1-5 g into a suitable flask and dissolve in about 50 mL water. Adjust to the methyl orange end point with HC1 or KOH solution, then add 50 mL 1 M HC1 solution. 5 hr to complete hydrolysis. Cool to about 50°C and rinse the condenser into the flask with water and petroleum ether.
6 x 150 mm, a mobile phase of 94:6 MeOH/H2O at 1 mL/min, and both refractive index and UV detectors. The RI detector is thermostatted at 352C, while the UV detector is used at 220 nm. In the normal mode of operation, LAS is eluted immediately, followed by unsulfonated material in order of chain length, followed by sulfones over the range 10-35 min. 5 min, after elution of the LAS. The total nonpolar material is then eluted through the RI detector, at a retention time of 9 min after injection. 3.
Analysis Of Surfactant by Thomas M. Schmitt