Interference of nitrate in the determination of formaldehyde by the chromotropic acid method

Krug, Elizabeth L.R.; Hirt, William

doi:10.1021/ac50020a059

Cited by 13 publications

(13 citation statements)

References 9 publications

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“…The injector, flame ionization detector, and column temperature were maintained at 160, 160 and llO"C, respectively. Formaldehyde concentration was determined using the chromatotropic acid method as described by Krug and Hirt (1977). The concentrations reported are extracellular concentrations.…”

Section: Analysesmentioning

confidence: 99%

An experimental investigation of stability and multiplicity of steady states in a biological reactor

1981

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Section: Analysesmentioning

confidence: 99%

An experimental investigation of stability and multiplicity of steady states in a biological reactor

1981

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“…The resulting open-chain BF,-adduct 4 (Fig. 1) is a stable compound and represents a new type of N-oxide boron complex with a boron,nitrogen-(1,3)betaine structure (7).…”

Section: Resultsmentioning

confidence: 98%

“…The exact nature of the chromogen and its formation by the reaction of CTA with formaldehyde has, however, not been unambiguously proven. The most often quoted structure (4)(5)(6)(7)(8) for the chromogen formed between CTA and formaldehyde has been the para,para-quinoidal adduct 2, but no direct proof of this structure has ever been presented. The structure is based on an analogy to the reaction of formaldehyde with aromatic compounds in the LeRosen test (8).…”

Section: Introductionmentioning

confidence: 99%

Chemistry of chromotropic acid. ¹H and ¹³C NMR spectroscopy of chromotropic acid and its derivatives

Georghiou¹,

Ho²,

Jablonski³

1991

Can. J. Chem.

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. J. Chem. 69, 1207 (1991).The 'H and I3C NMR spectra of chromotropic acid (CTA) (4,5-dihydroxy-2,7-naphthalenedisulphonic acid) have been unambiguously assigned. Proton NOED spectra were used to show the proximity of both H-3 and H-6 and the hydroxyl groups. Two-dimensional 'H-'~c NMR correlation spectra of CTA, of its corresponding diacetoxy derivative, and of 3-bromo-and 3,6-dibromo-CTA support the assignments. A regioselective deuterium exchange reaction of the C-3 and C-6 protons of CTA with deuterium oxide was observed during the NMR experiments. This latter finding is strongly indicative of the mode of formation, and of the nature of the chromogen formed in the reaction of CTA with formaldehyde in the well-known CTA-formaldehyde analytical reaction.

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“…The chromotropic acid method of Krug and Hirt (1977) was used in this study. With a 1.0% (w/v) solution of chromotropic acid in concentrated sulphuric acid a linear relationship between light absorption at 570 nm and formaldehyde concentration was found in the ränge o.i -i mgl" 1 of formaldehyde.…”

Section: Methodsmentioning

confidence: 99%

The Rate of Formaldehyde Emission from Chipboard

Kazakevičs¹,

Spedding²

1979

Holzforschung

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KeywordsFormaldehyde emission Particleboard Urea-formaldehyde resin Air flow rate FacesThe Rate of Formaldehyde Emission from Chipboard Summary The rates of emission of formaldehyde from particleboard (chipboard) samples bonded with a urea-formaldehyde resin have been measured. The rates are influenced by storage relative humidity and air flow rate over the surface. The emission rate from board edges is approximately five times greater than that from the faces. A model is proposed to explain the effects of air flow rate and relative humidity on the formaldehyde emission rate. Die Geschwindigkeit der Formaldehydabgabe aus Spanplatten ZusammenfassungDie Emissionsraten von Formaldehyd aus Proben von Harnstoff-Formaldehydharz verleimten Spanplatten wurden gemessen. Die Raten hängen von der relativen Feuchtigkeit während der Lagerung und der Luftgeschwindigkeit über der Oberfläche ab. Die Emissionsraten der Schmalflächen sind ungefähr fünfmal größer als die der Oberflächen. In einem Modell wird der Einfluß der Luftgeschwindigkeit und der relativen Luftfeuchtigkeit auf die Formaldehyd-Emissionsrate dargestellt.

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Interference of nitrate in the determination of formaldehyde by the chromotropic acid method

Cited by 13 publications

References 9 publications

An experimental investigation of stability and multiplicity of steady states in a biological reactor

An experimental investigation of stability and multiplicity of steady states in a biological reactor

Chemistry of chromotropic acid. ¹H and ¹³C NMR spectroscopy of chromotropic acid and its derivatives

The Rate of Formaldehyde Emission from Chipboard

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Interference of nitrate in the determination of formaldehyde by the chromotropic acid method

Cited by 13 publications

References 9 publications

An experimental investigation of stability and multiplicity of steady states in a biological reactor

An experimental investigation of stability and multiplicity of steady states in a biological reactor

Chemistry of chromotropic acid. 1H and 13C NMR spectroscopy of chromotropic acid and its derivatives

The Rate of Formaldehyde Emission from Chipboard

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Chemistry of chromotropic acid. ¹H and ¹³C NMR spectroscopy of chromotropic acid and its derivatives