Anwendung der Zeitabhängigkeit des Elektrodenpotentials in der Reaktionskinetik XII. Zwei konkurrierende Redox-Folgereaktionen mit gleichzeitiger reversibler Dismutation des Zwischenproduktes

Tockstein, A.; Dlask, Vladimír

doi:10.1135/cccc19711090

Cited by 11 publications

(2 citation statements)

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“…It is well-known that 1,4-phenylenediamines are extremely rapidly oxidized by such reagents as Fe3+ (45), Ce4+ (46), and bromine (47, 48), as well as anodically (49) to the cation radicals. In the case of DMPD, the perchlorate cation radical salt is relatively stable and is known as Wurster's red (47,48).…”

Section: Resultsmentioning

confidence: 99%

Nitroprusside and methylene blue methods for silicone membrane differentiated flow injection determination of sulfide in water and wastewater

Kubáň¹,

Dasgupta²,

Marx³

1992

Anal. Chem.

122

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Hydrogen sulfide evolved from an acidified sample is pre-concentrated by permeation in a stationary alkaline acceptor solution enclosed in a silicone rubber sample loop. Depending on the sample volume pre-concentrated, the applicable analytical range spans low micrograms/L to tens of mg/L for both methods. The methylene blue method is more sensitive by a factor of approximately 30 and actually permits practical determinations in the sub-micrograms/L levels. The limit of detection (LOD) for the nitroprusside method ranges from 20 micrograms/L for a 20 microL sample by conventional flow-injection determination (no membrane, throughput 30 samples/h) to less than 2 micrograms/L for 12 mL sample pre-concentrated in the membrane system (throughput 5 samples/h). The membrane is highly resistant to fouling and permits analysis of untreated wastewater samples bearing suspended solids, oil, grease, etc. without any pretreatment. No significant interference is observed with either chemistry. Although the nitroprusside chemistry is less sensitive, it does not involve the use of concentrated aggressive reagents and is recommended unless ultratrace determinations are essential. Viable reaction mechanisms are proposed for both of these chemistries.

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Section: Resultsmentioning

confidence: 99%

Nitroprusside and methylene blue methods for silicone membrane differentiated flow injection determination of sulfide in water and wastewater

Kubáň¹,

Dasgupta²,

Marx³

1992

Anal. Chem.

122

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“…Die Oxydation von N,N-Dimethyl-p-Phenylendiamin wurde von Tockstein und Dlask [33] mit Hilfe von potemiometrischen und spektrophotometrischen Methoden untersucht. Es wurde der gleiche formale Reaktionsmechanismus wie im Fall der Oxydation von p-Phenylendiamin vorgeschlagen.…”

Section: Mechanismus Der Oxydation Yon Nn-dimethyl-p-phenylendiaminunclassified

Anwendung thermometrischer Methoden auf die Untersuchung von oxydationsmechanismen aromatischer Amine

Velich¹,

Medek²,

Hottmarová³

1985

Journal of Thermal Analysis

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Darstellung substituierter p‐Aminophenole aus p‐Phenylendiaminen

Nickel

Kemnitz

1977

Angewandte Chemie

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Anwendung der Zeitabhängigkeit des Elektrodenpotentials in der Reaktionskinetik XII. Zwei konkurrierende Redox-Folgereaktionen mit gleichzeitiger reversibler Dismutation des Zwischenproduktes

Cited by 11 publications

References 0 publications

Nitroprusside and methylene blue methods for silicone membrane differentiated flow injection determination of sulfide in water and wastewater

Nitroprusside and methylene blue methods for silicone membrane differentiated flow injection determination of sulfide in water and wastewater

Anwendung thermometrischer Methoden auf die Untersuchung von oxydationsmechanismen aromatischer Amine

Darstellung substituierter p‐Aminophenole aus p‐Phenylendiaminen

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