Sensitivity Enhancement of the Formaldehyde Fluorimetric Determination by the use of a Surfactant

Largiuni, O.; Udisti, Roberto; Piccardi, Giovanni

doi:10.1080/03067310290024148

Cited by 5 publications

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References 30 publications

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“…The analytical method for HCHO determination is based on the Hantzsch reaction between HCHO and acetylacetone, acetic acid and ammonium acetate to form diacetyldihydrolutidine (DDL); a non-ionic surfactant (Triton X-100) was used to enhance the fluorescence signal by decreasing the quenching effects. 14 The samples were injected, via a 4-way Teflon Rheodyne Type-50 injection valve with a loop of 250 mL, into a flow of 1.09 mL min À1 of UHQ water, used as a carrier. The reagent solution (acetic acid 0.177 M, acetylacetone 0.145 M and ammonium acetate 2 M) was added, with a flow of 0.19 mL min À1 to the liquid line, and the reaction coil (0.5 mm id, 200 cm long) was warmed up to 75 1C in an in-line dry block heater (Thermobloc Falk 3372).…”

Section: Methodsmentioning

confidence: 99%

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Formaldehyde determination in seawater. Preliminary application to coastal samples at Terra Nova Bay (Antarctica)

et al. 2005

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A sensitive spectrofluorimetric-FIA (flow injection analysis) method for formaldehyde (HCHO) determination was improved with the aim of analysing seawater samples. The fluorescence emission versus HCHO concentration shows a linear pattern from sub microg L(-1) to about 1000 microg L(-1). The reproducibility at 15 ppb level is about 2%. Interferences from other aldehydes were checked; only glyoxal shows a significative interference, but only when its concentration is about 6000 times higher than that of formaldehyde. Superficial (microlayer, just sub-pack or sea-ice free sea surface) and deep (along the water column, sub-pack or in sea-ice free areas) seawater samples were collected near the coast at Terra Nova Bay (Ross Sea, Antarctica) during the 1998/1999 and 2001/2002 Italian Antarctic Expedition. We report here the preliminary results of the spectrofluorimetric-FIA determination of the HCHO content. The mean seawater superficial formaldehyde concentration was 15 microg L(-1); the concentration along the water column ranged between 4.5 to over 40 microg L(-1)(20 microg L(-1) mean concentration), usually with a maximum value for the 30 m depth, corresponding to a fluorescence maximum. The sampling was repeated 7 times in the austral summer in order to evaluate seasonal changes in the formaldehyde concentration/seawater depth profiles. The results show changes in the formaldehyde concentration at different depths.

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Section: Methodsmentioning

confidence: 99%

“…A detailed description of the analytical apparatus and of the method performance is reported by Largiuni et al 14…”

Section: Methodsmentioning

confidence: 99%