Simplified Conversion of a Direct-Current Polarograph to a Low Frequency, Alternating-Current Instrument.

Beckman, Herman; Gauer, William O.

doi:10.1021/ac60242a048

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The micrograms of bromide in a sample is determined from the standard curve after the diffusion current is calculated. 0.2 to 224.0 ppm of bromide (Beckman et al, 1966). These bromide levels were present as a result of a preplant soil treatment with an organo-bromine compound used for nematode control.…”

Section: Polurogruphymentioning

confidence: 99%

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A Polarographic Method for Bromide Residue Determination

Beckman

Allen

Crosby

et al. 1967

Journal of Food Science

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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.

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Section: Polurogruphymentioning

confidence: 99%

“…All other reagents used were C. P. and concentrations of solutions are noted in the text at the point of reference. Equipment A standard Model XV Sargent Polarograph was used for all d.c. measurements, while all a.c. measurements were made with the same equipment modified as previously described by Beckman et al ( 1966).…”

Section: Introduction Analysismentioning

confidence: 99%

A Polarographic Method for Bromide Residue Determination

Beckman

Allen

Crosby

et al. 1967

Journal of Food Science

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show abstract

“…These workers were able to develop a simple phase-sensitive ac polarograph w'ith specifications equal to or better than those of earlier instruments. Beckman and Gauer (15) have given details of a simple conversion unit to allow a Sargent Model XV dc polarograph to act as a low frequency alternating current polarograph. Peover and Pow'ell (166) have pointed out the importance of migration current in disturbing alternating current processes in solutions of high specific resistance or high concentration of electroactive species.…”

Section: Shults and Schaapmentioning

confidence: 99%