Spectrophotometric determination of formaldehyde with chromotropic acid in phosphoric acid medium assisted by microwave oven

Gigante, A. C.; Gotardo, M. A.; Tognolli, João Olímpio; Pezza, Leonardo; Pezza, Helena Redigolo

doi:10.1016/j.microc.2003.12.002

Cited by 43 publications

(26 citation statements)

References 15 publications

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“…Various methods are available for the determination of formaldehyde including electrochemistry [2][3][4][5], high performance liquid chromatography [6][7][8], gas chromatography [9], spectrometry [10][11][12][13][14][15], chemiluminescence [16][17][18][19], fluorometry [20][21][22][23], kinetics [24], mass spectrometry [25,26], etc. The primary course for the determination of formaldehyde in air involves (1) collecting air samples through sampling tubes, (2) desorbing the samples with solvents from the sampling tubes, and (3) determining formaldehyde in the liquids.…”

Section: Introductionmentioning

confidence: 99%

On-line monitoring of formaldehyde in air by cataluminescence-based gas sensor

Zhou

Zhang

et al. 2006

Sensors and Actuators B: Chemical

116

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Section: Introductionmentioning

confidence: 99%

On-line monitoring of formaldehyde in air by cataluminescence-based gas sensor

Zhou

Zhang

et al. 2006

Sensors and Actuators B: Chemical

116

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“…The data in this table show us that, within the tested concentration range, the maximum relative standard deviation is 2.41%, which means the precision of this method is high, and besides, the recovery rate is 97.8% ~ 104.5%, which indicates the accuracy of this method is satisfactory. The match rate of the results obtained from this method and gas chromatography is higher than 95% [7,8] . IV.…”

Section: H Precision and Accuracy Of Sample Analysismentioning

confidence: 75%

A Simple Method for Measuring Methanol Content in Gas Field Wastewater

Liu¹,

Tian²,

Sha³

2009

2009 3rd International Conference on Bioinformatics and Biomedical Engineering

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This paper focuses on the color reaction of chromotrope and formaldehyde, an oxidation product of methanol, with sulfuric acid as the medium, under the existence of phosphoric acid. The generated purple complexes have characteristic absorption peak at wavelength of 570nm. This reaction principle is applicable to measurement of methanol content in gas field wastewater. It is found there is a linear relationship between methanol content and absorbance while methanol content is within the range of 1~99.0mg/L. This method has added recovery rate of 97.8~104.5%, detection limit of 1.0mg/L and relative standard deviation less than 2.9%. The match rate of test results, obtained by this method and gas chromatography respectively, is higher than 95.0%. It is a simple, rapid and accurate method for supervision and management of methanol-containing wastewater in gas fields.

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“…In these cases, multivariate analysis has been extensively applied to determine the best conditions for the analytical methods employed [3,34,35]. The experimental design offers an efficient route to identify the conditions yielding the best results.…”

Section: Optimization Of Variables Using Multivariate Analysismentioning

confidence: 99%

A simple spectrophotometric method for the determination of tetracycline and doxycycline in pharmaceutical formulations using chloramine-T

et al. 2010

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A simple, rapid, accurate and inexpensive spectrophotometric method for the determination of tetracycline and doxycycline has been developed. The method is based on the reaction between these drugs and chloramine-T in alkaline medium producing red color products with absorbance maximum at the ë = 535 and 525 nm for the tetracycline and doxycycline, respectively. The best conditions for the reactions have been found using mol L and 7.12 x 10 mol L for the tetracycline and doxycycline, respectively. The proposed method was successfully applied to the determination of these drugs in pharmaceutical formulations and the results obtained were in good agreement with those obtained by the comparative method at the 95% confidence level.

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Spectrophotometric determination of formaldehyde with chromotropic acid in phosphoric acid medium assisted by microwave oven

Cited by 43 publications

References 15 publications

On-line monitoring of formaldehyde in air by cataluminescence-based gas sensor

On-line monitoring of formaldehyde in air by cataluminescence-based gas sensor

A Simple Method for Measuring Methanol Content in Gas Field Wastewater

A simple spectrophotometric method for the determination of tetracycline and doxycycline in pharmaceutical formulations using chloramine-T

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