Abstract
Abstract A capillary electrophoresis method was developed to quantitate the growth regulator maleic hydrazide (MH) in pesticide formulations. Liquid formulations were dissolved in water, injected into a capillary electrophoresis instrument, and monitored at 220 nm. The running buffer was 10 mM dibasic sodium phosphate at pH 9.0. Total analysis time was 10 min. Four liquid formulations with a guarantee of 30.2 or 30.3% potassium salt of MH were analyzed. Within-day coefficients of variation (CVs) ranged from 3.0 to 7.7%, and between-day CVs ranged from 5.5 to 10.0%. Purity of each MH peak was checked by using a photodiode array detector in the spectrum mode. No interferences were observed.
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