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The nonylphenol ethylene oxide nonionic detergent is extracted from wool grease by methanol under reflux and estimated from the infrared absorption at 1510 cm−1. The method estimates between 90 and 100% of the detergent present and is independent of the type of grease. Commercial wool greases recovered from nonionic-detergent wool-scouring liquors contained between 0·5 and 2·4% detergent.
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Anderson et al. (1966) studied this question.
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