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An improved technique for measurement of the dispersing powers of detergents

✍ Scribed by Snell, Foster D. ;Reich, Irving

Publisher
Wiley (John Wiley & Sons)
Year
1949
Weight
363 KB
Volume
68
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

Effective detergent action requires that soil be detached from the fabric. The usual technique with detergents is then to de‐flocculate and suspend in the detergent solution so that it can be rinsed away without re‐deposition. Experience shows that lack of sufficient dispersing power is the most common reason for poor detergent performance.

A method for measuring dispersing power previously described has been made simpler and less time‐consuming. The present method calls for agitating a lightly‐oiled umber soil with detergent solution, permitting to stand in a Nessler tube for two hours, then pipetting off a sample of the suspension and determining its turbidity in a modified electric turbidimeter. The results are best expressed directly as 100 times the reciprocal of the length needed to just obscure the filament. The variation of reciprocal value with concentration of suspended soil is shown to be linear.

When the detergent solution is cloudy, a correction is applied by subtracting the reciprocal reading of the detergent solution from the reciprocal reading of the suspension, thus obtaining a corrected reciprocal reading.

Typical dispersing power values for various types of detergents are listed. Soaps yield Values considerably higher than most synthetic agents.

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