Abstract
A method for the rapid determination of lubricants on textile fibers was developed. The method is applicable for most textile lubricants that contain a constant percentage of one or more nonionic surfactants. The surfactants con taining poly(oxyethylene) moieties react with ammonium tetrakis(thiocyanato) cobalt(II) (ATTC) to give a blue, water-insoluble complex that is extracted into dichloromethane and measured spectrophotometrically. To determine the amount of lubricant on cellulose acetate fibers, 2 g of the fibers and 25 ml of water are placed in an ultrasonic bath for 5 min. Twenty ml of the ATTC solution and 20 ml of the extract are added to a separatory funnel. Ten ml of dichloromethane is added; the complex is extracted; the absorbance of the dichloromethane solution is read at 620 nm on a spectrophotometer; and the amount of lubricant is read from a calibration curve. The standard deviation at the 95% confidence level is ± 0.07% lubricant. Five samples may be analyzed by this method in less than 1 h.
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