Interference of Pyridine Derivatives in Arsenic Determination

Gross, C. R.

doi:10.1021/ac50081a032

Cited by 10 publications

(3 citation statements)

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“…Perchloric acid use removed concern for interfering organic nitrogen compounds (14), hence only residual Noxide removal to avoid oxidizing conditions for the arsenate reduction step (19) was required prior to arsine generation. Gross on redissolved arsenic.…”

Section: Resultsmentioning

confidence: 99%

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Arsenic determination in tobacco by atomic absorption spectrometry

Griffin¹,

Hocking²,

Lowery³

1975

Anal. Chem.

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amount of smoke would have corresponded to 100-800 ppm SO2 (5-40% of chart)-even more if the mean particle size were submicron-since the mean wavelength of the opacity monitor was much larger than that of the SO2 instrument. CONCLUSIONThe present instrument concept appears well suited to in-situ measurement. Its embodiment as an SO2 analyzer is reasonably accurate and stable, even without continual on-line zero and range checks. Freedom from particulate interference is both a theoretical and practical reality. Compensation for aging of both phototubes and both lamps is also provided. Accuracy seems to be within the precision of corroborating measurements provided account is taken of residual long-term calibration drift, which amounts to perhaps 5% in three weeks. ACKNOWLEDGMENTThe authors are indebted to their then immediate supervisors, . P. Markant of B&W Research and R. A. Murzyn of Bailey Meter Company, for continued encouragement and support. Our field test program could not have been successful without the generous cooperation of R. S. Bau-man

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Section: Resultsmentioning

confidence: 99%

“…(14) has removed the arsenic from the ¿V-oxide solution by precipitation, and then carried out the analysis230 • ANALYTICAL CHEMISTRY, VOL. 47, NO.…”

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confidence: 99%

Arsenic determination in tobacco by atomic absorption spectrometry

Griffin¹,

Hocking²,

Lowery³

1975

Anal. Chem.

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“…reported (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). The remedy most frequently used is to heat the sample until nitric acid is deemed no longer present (1-3, 6,14,15,17,19,20).…”

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confidence: 99%

Interference by volatile nitrogen oxides and transition-metal catalysis in the preconcentration of arsenic and selenium as hydrides

Brown¹,

Fry²,

Moyers³

et al. 1981

Anal. Chem.

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When tested individually In a clean system, NOa~a nd HNOa are shown not to be serious Inhibitors of AsH3 and H2Se evolution. The real inhibitors of AsH3 and H2Se evolution (encountered when solid samples are oxidatively dissolved In nitric acid) are shown to be correspondingly reduced nitrogen oxides (N02~, etc.) produced In sample digestion. Volatile NO, Interferants can then result upon acidic disproportionation. These volatile NO, species are found to transport with the AsH3 and H2Se analyte. The N203 species Is detected In a cryogenic trap. When dissolved In downstream H2S04 drying agents, the NO, can give rise to powerful oxidants such as NO+ which can accumulate In the H2S04 and thereby account for "memory Interferences" encountered with subsequent samples. The use of sulfamic acid Is Investigated In the preliminary removal of reduced nitrogen oxides such as N02~. Transition metal cation interferences are also studied. Several metal masking procedures previously reported to work well for AsH3 are shown here to fall for the evolution of H2Se. BH3CN" Is shown to be an effective new reductant to evolve AsH3 and H2Se from As(III,V) and Se(IV) In acid media.

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Arsen

Karl-Kroupa¹

1951

Elemente Der Fünften Hauptgruppe

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Interference of Pyridine Derivatives in Arsenic Determination

Cited by 10 publications

References 0 publications

Arsenic determination in tobacco by atomic absorption spectrometry

Arsenic determination in tobacco by atomic absorption spectrometry

Interference by volatile nitrogen oxides and transition-metal catalysis in the preconcentration of arsenic and selenium as hydrides

Arsen

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