| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Pereira, E. A. | |
| dc.creator | Dasgupta, P. K. | |
| dc.date | 2014-05-20T15:28:49Z | |
| dc.date | 2016-10-25T18:04:01Z | |
| dc.date | 2014-05-20T15:28:49Z | |
| dc.date | 2016-10-25T18:04:01Z | |
| dc.date | 1997-01-01 | |
| dc.date.accessioned | 2017-04-06T00:09:17Z | |
| dc.date.available | 2017-04-06T00:09:17Z | |
| dc.identifier | International Journal of Environmental Analytical Chemistry. Reading: Gordon Breach Sci Publ Ltd, v. 66, n. 3, p. 201-213, 1997. | |
| dc.identifier | 0306-7319 | |
| dc.identifier | http://hdl.handle.net/11449/38561 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/38561 | |
| dc.identifier | 10.1080/03067319708028363 | |
| dc.identifier | WOS:000072293600005 | |
| dc.identifier | http://dx.doi.org/10.1080/03067319708028363 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/881661 | |
| dc.description | A sensitive and affordable approach is described for the in-situ measurement of ambient formaldehyde. Air is sampled around a 100 microliter aqueous drop containing 3-methyl-2-benzothiazoline hydrazone. After a desired period of sampling (typ. 5 min) and a waiting period of 10 min for the reaction to be completed, a second reagent (FeCl3) is added to the drop by means of a conjoined conduit. A blue product is formed and is read after an additional 10 min of reaction by a fiber-optic/light emitting diode based photodetector. A fresh drop is then formed and the process begins anew. As demonstrated here, the limit of detection is similar to 6.25 mu g m(-3) HCHO but can be significantly improved by using longer sampling times and a sampling rate higher than 100 mi min(-1) used in most of this work. This is the first example of a chromogenic drop sensor that utilizes sequential reagent addition. | |
| dc.language | eng | |
| dc.publisher | Gordon Breach Sci Publ Ltd | |
| dc.relation | International Journal of Environmental Analytical Chemistry | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | formaldehyde | |
| dc.subject | colorimetry | |
| dc.subject | drop sensor | |
| dc.subject | light emitting diode | |
| dc.title | Measurement of atmospheric formaldehyde using a drop collector and in-situ colorimetry | |
| dc.type | Otro | |
