The fluorimetric determination of formaldehyde

Belman, Sidney

doi:10.1016/s0003-2670(00)88591-8

Cited by 188 publications

(64 citation statements)

References 18 publications

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“…The measurement of HCHO was based on the fluorimetric detection of the Hantzsch reaction product, as originally described by Belman (1963). The instrument's noise is about 1.5% of the concentration reading up to concentrations of about 20 ppbv.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Chemical characteristics assigned to trajectory clusters during the MINOS campaign

et al. 2003

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Abstract. During the Mediterranean Intensive OxidantStudy (MINOS) in August 2001 a total of 14 measurement flights were performed with the DLR Falcon jet aircraft from Heraklion, Crete. One objective of this campaign was to investigate the role of long-range transport of pollutants into the Mediterranean area. An analysis of 5-day back trajectories indicates that in the lower troposphere (0-4 km) air masses originated from eastern and western Europe, in the mid-troposphere (4-8 km) from the North Atlantic Ocean region and in the upper troposphere (8-14 km) from North Atlantic Ocean/North America (NANA) as well as South Asia. We allocated all back trajectories to clusters based on their ending height and source region. The mixing ratios of ozone, nitrogen oxide, total reactive oxidized nitrogen (NO y ), formaldehyde, methanol, acetonitrile, acetone, peroxyacetyl nitrate (PAN), carbon dioxide, carbon monoxide and methane measured along the flight tracks are examined in relation to the different cluster trajectories. In the lower troposphere the mean trace gas mixing ratios of the eastern Europe cluster trajectories were significantly higher than those from western Europe. In the upper troposphere air from the NANA region seems to be influenced by the stratosphere, in addition, air masses were transported from South Asia, being influenced by strong convection in the Indian monsoon.

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Section: Measurement Techniquesmentioning

confidence: 99%

Chemical characteristics assigned to trajectory clusters during the MINOS campaign

et al. 2003

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“…Nash 15 introduced a colorimetric method into analytical chemistry for HCHO; it was based on the Hantzsch reaction of formaldehyde with acetylacetone or 2,4-pentanedione in the presence of ammonia to form a yellow product of 3,5-diactyl-1,4-dihydrolutidine (DDL). Later, Belman 16 found that, without any other changes, highly sensitive measurements could be made by fluorometry instead of spectrophotometry.…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Reagent for Hantzsch Reaction for the Determination of Formaldehyde by Spectrophotometry and Fluorometry

2007

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A novel reagent, acetoacetanilide (AAA), was introduced to the determination of formaldehyde based on Hantzsch reaction. A simple and highly sensitive fluorometric method was achieved by using AAA. The main advantages in the use of this reagent are: the reaction is carried out at room temperature without any heating system, the cyclization product based on Hantzsch reaction is soluble in water, and the product can be detected by spectrophotometry and fluorometry. The maximum absorption wavelength of the product occurs at 368 nm, and the maximum excitation and emission wavelengths are found at 370 and 470 nm, respectively. Several important experimental variables of the procedures were examined; particularly, the reaction temperature, reaction time, concentrations of reagents, and pH of the reagent solution were optimized for improving the detecting sensitivity. The calibration graph was linear in the range of 1 × 10 -7 -1 × 10 -6 M or much higher concentrations. The limit of detection (LOD), based on three times of the standard deviation of the reagent blank, was 2.0 × 10 -8 M. The proposed method was applied to the determination of formaldehyde in environmental water samples. Many foreign species commonly existing in water samples did not interfere with the determination of formaldehyde in the proposed method.

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“…The amount of the released formaldehyde was determined with Nash reagent as detailed by Belman [2] after subtracting appropriate blanks run under the same conditions but containing the solvent alone.…”

Section: Assay Of N-demethylase Activitiesmentioning

confidence: 99%

In vitro formation of metabolic-intermediate cytochrome P450 complexes in rabbit liver microsomes by tiamulin and various macrolides

Carletti

Gusson²,

Zaghini³

et al. 2003

Vet. Res.

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-Tiamulin and a number of macrolides were evaluated as to their ability in forming metabolic-intermediate (MI) complexes with cytochrome P450 in liver microsomes from rabbits bred for meat production. Complex formation, which occurred only in preparations where the expression of P450 3A was increased as the result of rifampicin pre-treatment and with different kinetics, was in the order tiamulin > erythromycin > TAO » roxithromycin » tylosin and did not take place with tilmicosin and spiramycin. Most of the tested compounds underwent an oxidative N-dealkylation and a good relationship could be found between the rate of N-dealkylase activity in induced preparations and the aptitude in generating MI complexes. Although the results from in vitro studies should be interpreted with caution, it is suggested that the potential for in vivo drug interactions also exists in the rabbit for tiamulin and for four out of the six tested macrolides. tiamulin / macrolide / rabbit / metabolic-intermediate complex / in vitro

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The fluorimetric determination of formaldehyde

Cited by 188 publications

References 18 publications

Chemical characteristics assigned to trajectory clusters during the MINOS campaign

Chemical characteristics assigned to trajectory clusters during the MINOS campaign

Development of Novel Reagent for Hantzsch Reaction for the Determination of Formaldehyde by Spectrophotometry and Fluorometry

In vitro formation of metabolic-intermediate cytochrome P450 complexes in rabbit liver microsomes by tiamulin and various macrolides

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