A simple, low cost and fast sample preparation method for fluorine determination by ISE in leguminous seeds and oilseeds.

[Display omitted] • MIC-DV was proposed for food digestion and fluorine determination by ISE. • LOQ values for F after MIC-DV were lower than the AOAC method. • F-ISE determination was carried out directly in the absorbing solution without dilution. • MIC-DV was whiter than MIC and AOAC methods according to WAC principles. This work presents the first report of the application of microwave-induced combustion in disposable vessels (MIC-DV) as a simple and fast sample preparation step for fluoride determination by ion-selective electrode (ISE) in leguminous seeds and oilseeds samples. Several experimental conditions of MIC-DV were evaluated, such as sample mass, absorbing solution, volume of combustion igniter, purging time with oxygen, and the use of successive combustion cycles. The accuracy of MIC-DV/ISE method was evaluated by comparing the results obtained by microwave-induced combustion and determination by ion chromatography, with agreements ranged from 94 to 106%. The method allowed to achieve relatively low limits of quantification (8.3 to 16 µg g−1) comparing to AOAC method (40 µg g−1), besides the use of small amounts of reagents, less handling of digests, making the method greener and with portable features comparing to other methods. [ABSTRACT FROM AUTHOR]