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Surface active agents -- Technical ethoxylated fatty amines -- Methods of analysis
On separate test portions the following determinations are carried out: measurement of the apparent pH in methanolic medium; determination of the water content; determination of the distribution of primary, secondary and tertiary amines contents; determination of oxyethylene groups content; determination of sulphated ash.
Furthermore, an aqueous or methanolic solution of a test portion is prepared and the free polyethylene glycols are isolated.
On the separated polyethylene glycols the absence of nitrogen is verified and their relative molecular mass is determined.
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