RAPID SPECTROPHOTOMETRIC AND VISUAL-TEST DETERMINATION OF ARSENIC IN FOOD AND WATER
DOI:
https://doi.org/10.15421/jchemtech.v33i3.321738Keywords:
arsenic, spectrophotometry, ultrasound, sample preparation intensification, test methods, food products, water analysis, express methodsAbstract
An express method for spectrophotometric determination of arsenic in various food products has been developed. The intensifying effect of ultrasound at the stage of sample preparation has been established. Optimal parameters of ultrasonic exposure are selected (frequency interval 22–40 kHz, intensity 1.31–3.48 W/cm2, processing time 0.5–3 min) for ultrasonic intensification of mineralization of seven groups of food products (vegetables, fruits, cereals, legumes, juices, beer, coffee). Application of ultrasound for intensification wet ashing after adding a certain amount of a mixture of oxidizers to the analyzed samples accelerates the stage of mineralization by hundreds of times, the total duration of the analysis by tens of times, and the consumption of oxidizers by several times. The accuracy of the results was checked by the standard addition method. In addition, these samples analyzed by the standard addition method after wet ashing. Satisfactory agreement between the results of all determinations was observed. Methods for semi-quantitative visual test determination of Arsenic were proposed using test scales at the level of 0.01 mkg/ml. Disks from chromatographic FN-5 paper impregnated with solutions of arsenic-sensitive reagents in organic solvents were used. The combination of preconcentration and determination made it possible to control arsenic in waters at the level and below the maximum permissible concentration.
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