Add time:08/17/2019         Source:sciencedirect.com

Methods are presented for determining diisobutyl and diisopropylnaphthalenesulphonates in pesticides formulated as wettable powders or water dispersible granules. The dispersing agents were concentrated on anion-exchange cartridges and after removal of interfering substances eluted with methanol containing 5% hydrochloric acid. The various isomers were separated by reversed-phase high-performance liquid chromatography on an octyl-modified column using a water-methanol gradient or on a cyanoalkyl-modified column with water-methanol. Quantitative results were obtained by comparing the peaks with those of the standard technical material. Various groups of leaks were identified as mono-, di- and triisobutylnaphthalenesulphonates respectively.

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