Publication
A multi-commuted flow injection system with a multi-channel propulsion unit placed before detection: Spectrophotometric determination of ammonium
| dc.contributor.author | Oliveira, Sara M. | |
| dc.contributor.author | Lopes, Teresa I. M. S. | |
| dc.contributor.author | Tóth, Ildikó V. | |
| dc.contributor.author | Rangel, António O. S. S. | |
| dc.date.accessioned | 2010-10-11T17:44:02Z | |
| dc.date.available | 2010-10-11T17:44:02Z | |
| dc.date.issued | 2007 | |
| dc.description.abstract | A flow system with a multi-channel peristaltic pump placed before the solenoid valves is proposedto overcome some limitations attributed to multi-commuted flow injection systems:the negative pressure can lead to the formation of unwanted air bubbles and limits the useof devices for separation processes (gas diffusion,dialysis or ion-exchange). The proposed approach was applied to the colorimetric determination of ammonium nitrogen. In alkaline medium, ammonium is converted into ammonia, which diffuses over the membrane,causing a pH change and subsequently a colour change in the acceptor stream (bromothymol blue solution). The system allowed the re-circulation of the acceptor solution and was applied to ammonium determination in surface and tap water, providing relative standard deviations lower than 1.5%. A stopped flow approach in the acceptor stream was adopted to attain a low quantification limit(42ugL−1) and a linear dynamic range of 50–1000ugL−1 with a determination rate of 20h−1. | por |
| dc.description.version | info:eu-repo/semantics/publishedVersion | |
| dc.identifier.citation | "Analytica chimica acta". ISSN 0003-2670. 600 (2007) 29–34 | por |
| dc.identifier.doi | 10.1016/j.aca.2007.01.019 | |
| dc.identifier.uri | http://hdl.handle.net/10400.14/2819 | |
| dc.language.iso | eng | por |
| dc.publisher | Elsevier | por |
| dc.subject | Multi-commuted flow system | por |
| dc.subject | Gas diffusion | por |
| dc.subject | Waters | por |
| dc.subject | Trace levels of ammo | por |
| dc.subject | Spectrophotometry | por |
| dc.title | A multi-commuted flow injection system with a multi-channel propulsion unit placed before detection: Spectrophotometric determination of ammonium | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| person.familyName | Oliveira | |
| person.familyName | Tóth | |
| person.familyName | Santos Silva Rangel | |
| person.givenName | Sara | |
| person.givenName | Ildikó | |
| person.givenName | António Osmaro | |
| person.identifier.ciencia-id | D61D-7CFB-178A | |
| person.identifier.orcid | 0000-0003-0649-2694 | |
| person.identifier.orcid | 0000-0002-7342-1063 | |
| person.identifier.orcid | 0000-0002-6486-8947 | |
| person.identifier.rid | M-5180-2013 | |
| person.identifier.rid | G-1733-2010 | |
| person.identifier.scopus-author-id | 16022986400 | |
| person.identifier.scopus-author-id | 35512332800 | |
| person.identifier.scopus-author-id | 7004827387 | |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |
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| relation.isAuthorOfPublication.latestForDiscovery | 467be022-fd9c-4549-aa48-48ebcc1098eb |