By Thomas M. Schmitt
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Additional info for Analysis Of Surfactant
Ester SO3 Acid-catalyzed hydrolysis of, for example, sodium lauryl sulfate, yields lauryl alcohol and sodium hydrogen sulfate. The sodium bisulfate is easily titrated. Depending on the expected impurities, this determination may be made on either the original sample or on the alcohol-soluble portion. If on the latter, the determination should be combined with the total fatty alcohol method, above, by titrating the aqueous phases. The gravimetric method is superior to the titration method if interferences are present in the product.
1. Liquid-Liquid Extraction There are a number of standard methods for this analysis, for example, ASTM D1568 for alkylaryl sulfonates, ASTM D1570 for analysis of alkyl sulfates, ISO 1104 for alkanesulfonates and certain non-LAS alkylarylsulfonates, and ASTM D3673 for oc-olefin sulfonates (6-9). As with any extraction, it is advisable to check the isolated oil by IR 14 Chapter 1 spectroscopy to determine if any anionic material has also been extracted under the conditions used. Recovery of oil is good for sulfonates, but several extractions are necessary for alkyl sulfates, while recovery from alkyl ether sulfates is quite low (10).
L of a 5% MeOH solution. Modified Dragendorff reagent is suitable for visualization. 7. The sulfated material remains at the origin. 1%. (b) HPLC. Free alcohol may be selectively determined in alkyl sulfates by HPLC of urethane derivatives. Alcohols are separated according to their alkyl chain length. Naphthylisocyanate is preferred to the more frequently used phenylisocyanate because fewer byproducts are formed and because of the higher molar absorptivity of the derivatives. 001 mole percent (65).