Benzidine and its derivatives in analytical chemistry

Lyle, Samuel J.

doi:10.1016/0039-9140(59)80115-6

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…Benzidine dyes have a long history of use in spectrophotometric determinations of oxidizing agents. 1,2 Of these, alkoxysubstituted benzidines, especially 3,3'-dimethoxybenzidine (DMB; o-dianisidine), have often been used because of their favorable properties. 3 Benzidine dyes act as prochromophores; the actual chromophores are produced by a redox reaction between the analyte and the benzidine dye.…”

Section: Aim Of Investigationmentioning

confidence: 99%

“…By analogy with other chemical systems, 7 it is believed that dibromine reacts via a radical mechanism to give the chromophore [eqn. (2)].…”

Section: Sensitivity and Linearity Of The Calibration Curvementioning

confidence: 99%

“…Thus, the linear portion of the calibration curve can be assumed to result entirely from eqn. (2). If we extrapolate back to the ordinate from the linear region, we can estimate the amount of bromate effectively consumed by the impurity.…”

Section: Sensitivity and Linearity Of The Calibration Curvementioning

confidence: 99%

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Influence of reagent purity on the ion chromatographic determination of bromate in water using 3,3′-dimethoxybenzidine as a prochromophore for photometric detection

Urbansky

Brown

2000

J. Environ. Monitor.

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Variable availability of the purified dihydrochloride salt of 3,3'-dimethoxybenzidine (DMB; ortho-dianisidine) led us to investigate the effects of reagent purity on the analytical results obtained when this reagent is used in the photometric determination of the disinfection byproduct bromate. After analyte ions are separated by ion chromatography, a solution of DMB (post-column reagent) is added to the eluate and the DMB is oxidized, thereby producing a chromophore detected by its absorbance. Although some commercial products of undefined grade performed well, others did not. Variability was also observed between lots of purified material. Sensitivity at low concentrations (< 5 micrograms L-1 BrO3-) varied by a factor of up to 10. In some cases, the lower limit of detection for photometric detection was greater than that obtained using conductivity detection, as high as 5-7 micrograms L-1 BrO3-. An impurity or several impurities are suspected to be responsible for deviations from linearity at low analyte concentrations. This investigation underscores the need for ensuring reagent purity in environmental analyses. Ideally, chemical manufacturers will meet the needs of analytical chemists who test potable water and begin producing a high grade material in sufficient quantities to meet monitoring requirements. The establishment of third-party standards for a spectrophotometric grade of DMB.2HCl would be helpful in ensuring that a variety of manufacturers could supply products of uniformly high quality that would be suitable for the measurement of bromate in public drinking water supplies.

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Section: Aim Of Investigationmentioning

confidence: 99%

“…By analogy with other chemical systems, 7 it is believed that dibromine reacts via a radical mechanism to give the chromophore [eqn. (2)].…”

Section: Sensitivity and Linearity Of The Calibration Curvementioning

confidence: 99%

See 1 more Smart Citation

Influence of reagent purity on the ion chromatographic determination of bromate in water using 3,3′-dimethoxybenzidine as a prochromophore for photometric detection

Urbansky

Brown

2000

J. Environ. Monitor.

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“…An interesting review' of separations of inorganic ions by gas, liquid, and solid-phase distribution procedures has been presented by West (216), and a general discussion of solvent extraction procedures has been given by Trémillon (198). A review of benzidine and its derivatives has been presented (115), and a pertinent review' of the application of EDTA as a microanalytical reagent has appeared (18). This latter discussion covers the use of EDTA in masking interfering ions and in microtitrations.…”

Section: Reviewsmentioning

confidence: 99%