A Polarographic Method for Bromide Residue Determination

Autor: Herman Beckman, Paul T. Allen, Donald G. Crosby, Charles Mourer, W. O. Gauer
Rok vydání: 1967
Předmět:
Zdroj: Journal of Food Science. 32:595-598
ISSN: 1750-3841
0022-1147
DOI: 10.1111/j.1365-2621.1967.tb00841.x
Popis: SUMMARY— A polarographic analytical procedure has been developed to give specific and quantitative responses based on the bromide content of food crops and other media. Improved extraction, ashing and oxidizing systems are used to improve recovery and reliability. The bromides present in plant material can be quantitatively removed with an aqueous-alcohol solution, leaving the major portions of fats, protein and sugars undissolved. The ashing of the residue from this extract is simplified and allows larger samples to be processed. An absorption-reaction train is used, first to oxidize the bromide to bromine and second from bromine to bromate. The bromate is measured for quantitation by polarography in a 1 M NH4OH/NH4CI solution. The polarogram is recorded using an applied voltage of −1 to −2 volts using the potential measured across the DME vs. a mercury pool. Application of this procedure has been made to 40 crops during the past three years. A mean recovery of 88.8 per cent has been calculated from fortified samples of every crop analyzed.
Databáze: OpenAIRE
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