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Thomas M. Schmitt's Analysis Of Surfactant PDF

By Thomas M. Schmitt

ISBN-10: 0824704495

ISBN-13: 9780824704490

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Extra resources for Analysis Of Surfactant

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6% range. It may be necessary to modify the ratio of ethanol/ water, depending on the particular surfactant analyzed. This procedure was optimized for analysis of a sulfosuccinate. For higher sensitivity, turbidity measurements may be made at a lower wavelength, down to about 400 nm. 3. Sodium Sulfite Some anionic surfactants are prepared using sulfite compounds. Such products are analyzed for residual sulfite ion. The standard method for sulfite determination is iodometric titration. Determination of sulfite in a-olefin sulfonates presents special problems, covered in detail by Perm and Griffin (29).

This procedure simultaneously gives the alkyl and ethoxy chain length, although the chromatogram requires careful interpretation. This technique is described in Chapter 8. 5 mL hydriodic acid. The head space is purged with nitrogen, then the tube is stoppered and placed within a pressure tube in a heating block. After heating at 185eC for 10 min, the tube is cooled and 3 mL water is added. The resulting alkyl iodides are extracted with three 1 -mL portions of petroleum ether. The combined extracts are washed free of iodine with two 1-mL portions of 20% aqueous sodium thiosulfate solution, then evaporated to dryness on a water bath.

The ether phase is washed 3 times with 15-mL portions of 3 M HC1, then transferred to a tared extraction flask and evaporated to dryness. Drying is continued in an oven at 1202C to insure removal of HC1, then the residue is cooled, weighed, and titrated with NaOH solution. 3. Alkenesulfonate Content Alkenesulfonate content is determined by HPLC, although GC and TLC may also be applied (Chapters 7-9). The determination may also be made by performing an unsaturation analysis, the result of which must be corrected for the presence of any unsulfonated olefin starting material.

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Analysis Of Surfactant by Thomas M. Schmitt

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