Determination of formaldehyde in air by ion-exclusion and ion-exchange chromatography with pulsed amperometric detection

Shi, Yilin; Johnson, Brian J.

doi:10.1039/an9962101507

Cited by 7 publications

(8 citation statements)

References 13 publications

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“…The data of Table suggest that such an adsorption effect does not affect the collection efficiency significantly down to formaldehyde concentrations of 16 ppb v/v in air. However, at much lower concentrations, it will be necessary to verify that there is no decrease in the measured collection efficiency as we approach the estimated detection limit of about 1 ppb v/v with the chromotropic acid method or whatever other limit may apply with an alternative measuring method, such as those of refs , , or 23.…”

Section: Resultsmentioning

confidence: 97%

Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler

Woo

Barry

Zaromb

1998

Environ. Sci. Technol.

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In view of the known adverse health effects of formaldehyde and its suspected carcinogenicity, a convenient and simple apparatus for its rapid detection is highly desirable. A portable high-throughput liquid absorption air sampler (PHTLAAS) was therefore evaluated for the rapid and ultrasensitive detection of formaldehyde. Controlled concentrations of formaldehyde in air were generated with a constant-drive syringe pump and mixing chamber apparatus and were either sampled by the PHTLAAS, at a rate of about 200 L/min, or fed to two series-connected liquid impingers. In either case, the formaldehyde was absorbed in a small volume of aqueous sodium bisulfite and measured by the chromotropic acid method. The reddish-purple color of the chromogen formed with chromotropic acid provides a sensitive test for the screening of low levels of formaldehyde in ambient air. Comparison of samples collected from the test sampler with those from the impingers before and after each test yielded PHTLAAS collection efficiencies of about 50 and 40% at formaldehyde concentrations of 16 and 45 ppb v/v, respectively, which translate to a lower detection level of about 1 ppb v/v with the chromotropic acid method. The PHTLAAS was also tested in parallel with a standard method for preconcentration and detection of formaldehyde vapor in an applied anatomy laboratory, with the results of the two methods showing fair agreement. The collection method is simple and fast, and should be applicable to the sampling and preconcentration of other hazardous air contaminants with suitable trapping solutions. However, at ambient temperatures below or above 20−24 °C, caution should be exerted in applying its laboratory-derived correction factors.

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Section: Resultsmentioning

confidence: 97%

Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler

Woo

Barry

Zaromb

1998

Environ. Sci. Technol.

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“…Various analytical methods have been reported to determine formaldehyde in vapors [1,2] or especially in liquid phase [3][4][5]. Amperometric sensors in potentiostatic mode using noble metal as electrodes deposited on Nafion membranes are widely reported [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A fuel-cell-type sensor for detection of formaldehyde in aqueous solution

Sun

Qin

et al. 2007

Sensors and Actuators B: Chemical

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“…Potenciometricamente, vários analitos foram quantificados, dentre os quais, haletos [11][12][13][14] , cianeto 15 , vitamina C e glutationa 16 . Amperometricamente, cianeto, sulfeto, iodeto, brometo e formaldeído foram analisados por diferentes autores [17][18][19] . Por voltametria, sulfato 20 , zinco 21 , nitrato 22 e DNA 23 também foram quantificados utilizando eletrodos de prata.…”

Section: Introductionunclassified

Aplicações eletroanalíticas com eletrodos de prata confeccionados a partir de CDs graváveis

Richter¹,

Jesus²,

Neves³

et al. 2003

Quím. Nova

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. Prof. Lineu Prestes, 748, 05508-900 São Paulo -SP Recebido em 13/12/02; aceito em 29/4/03 ELECTROANALYTICAL APPLICATIONS OF SILVER ELECTRODES BUILT FROM RECORDABLE CDs. This paper presents a new way for the construction of silver electrodes utilizing recordable CDs. The new electrodes were explored for the quantification of chloride (by potentiometry/FIA), cyanide (by amperometry/FIA) and for lead analysis (by square wave voltammetry). For the flowing measurements, a digital multimeter, connected to a microcomputer (via RS 232 interface) was used to collect directly the potential signal (for Cl -measurements) or to take the output signal from a potentiostat (for CN -measurements). The square wave voltammetry analysis was performed in a commercial instrument. The results shown good performance of the new electrodes and the detection limit (s/n = 3) attained for these three analytes were: 0. INTRODUÇÃODurante muitos anos, mercúrio se constituiu no material mais empregado como eletrodo em aplicações eletroanalíticas. No entanto, a alta toxicidade deste metal e a estreita faixa de trabalho na região anódica fizeram com que os eletrodos sólidos passassem a ganhar crescente importância. Dentre os eletrodos sólidos, receberam mais atenção os eletrodos de carbono (vítreo, pirolítico e de pasta), ouro, platina e prata. Além destes, em menor escala, também são utilizados eletrodos de cobre, níquel, alumínio, antimônio, paládio, molibdênio, entre outros 1 . Uma das principais vantagens do eletrodo de mercúrio é a possibilidade da sua renovação através da troca da gota, principalmente em meios onde ocorre o envenenamento do eletrodo. Eletrodos sólidos não apresentam esta vantagem e para a renovação de sua superfície diferentes procedimentos de limpeza são descritos 2-4 . Uma condição intermediária pode ser alcançada com eletrodos descartáveis. Trata-se de dispositivo de baixo custo, de construção simples e rápida, que pode ser descartado sempre que apresentar algum problema e substituído por outro. Os eletrodos impressos constituem-se em exemplo bastante popular de eletrodos descartáveis 5 . Recentemente foi descrito um processo de construção de eletrodos de ouro de baixo custo, que permite descartar o sensor sempre que for necessário 6 . Tais eletrodos foram construídos a partir de discos compactos graváveis (CD-Rs). Devido à simplicidade de construção e ao baixo custo dos CD-Rs, estes eletrodos podem ser utilizados e, posteriormente, descartados em casos de envenenamento, formação de óxidos sobre sua superfície ou ainda algum outro problema.CD-Rs possuem em sua constituição uma película metálica de ouro ou prata. Os eletrodos de ouro já foram explorados em nosso grupo para a quantificação de traços de metais pesados 7,8 e para a análise de fármacos 9,10 . A construção de eletrodos de prata a partir de CD-Rs também é de grande relevância. Eletrodos de prata convencionais são muito utilizados para medidas potenciométricas e sua aplicação em análises amperométricas e voltamétricas tem recebido crescente atenção. Potenciom...

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Determination of formaldehyde in air by ion-exclusion and ion-exchange chromatography with pulsed amperometric detection

Cited by 7 publications

References 13 publications

Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler

Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler

A fuel-cell-type sensor for detection of formaldehyde in aqueous solution

Aplicações eletroanalíticas com eletrodos de prata confeccionados a partir de CDs graváveis

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