Publication
Sequential injection determination of nitrate in vegetables by spectrophotometry with inline cadmium reduction
| dc.contributor.author | Oliveira, Sara M. | |
| dc.contributor.author | Lopes, Teresa I. M. S. | |
| dc.contributor.author | Rangel, António O. S. S. | |
| dc.date.accessioned | 2011-10-22T09:18:29Z | |
| dc.date.available | 2011-10-22T09:18:29Z | |
| dc.date.issued | 2007 | |
| dc.description.abstract | A sequential injection system for the determination of nitrate (NO3 2) in vegetables was developed to automate this determination, allowing for substantially reduced reagent consumption and generated waste using low-cost equipment. After extraction with water and filtration, the extracted nitrate is reduced inline to nitrite in a copperized cadmium (Cd) column and determined as nitrite. According to the Griess–Ilosvay reaction, nitrate is diazotized with sulfanilamide and coupled with N-(1-naphtyl)-ethylenediamine dihydrochloride to form a purple-red azo dye monitored at 538 nm. Nitrate can be determined within a range of 1.35–50.0 mg L21 of NO3 2 (corresponding to 0.270–10.0 g of NO3 2 per kg of vegetable), with a conversion rate of nitrate to nitrite of 99.1+0.8%. The results obtained for 15 vegetable extracts compare well with those provided by the classical procedure, with a sampling throughput of 24 determinations per hour and relative standard deviations better than 1.2%. | por |
| dc.description.version | info:eu-repo/semantics/publishedVersion | |
| dc.identifier.citation | "Communications in soil science and plant analysis". ISSN 0010-3624. 38: 3-4 (2007) 533-544 | por |
| dc.identifier.doi | 10.1080/00103620601174635 | |
| dc.identifier.uri | http://hdl.handle.net/10400.14/6765 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | Taylor & Francis Group | por |
| dc.subject | Copperized cadmium column | por |
| dc.subject | Nitrate | por |
| dc.subject | Sequential injection analysis | por |
| dc.subject | Spectrophotometry | por |
| dc.subject | Vegetables | por |
| dc.title | Sequential injection determination of nitrate in vegetables by spectrophotometry with inline cadmium reduction | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| person.familyName | Oliveira | |
| person.familyName | Santos Silva Rangel | |
| person.givenName | Sara | |
| person.givenName | António Osmaro | |
| person.identifier.ciencia-id | D61D-7CFB-178A | |
| person.identifier.orcid | 0000-0003-0649-2694 | |
| person.identifier.orcid | 0000-0002-6486-8947 | |
| person.identifier.rid | M-5180-2013 | |
| person.identifier.scopus-author-id | 16022986400 | |
| person.identifier.scopus-author-id | 7004827387 | |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | 6663c3d3-4fe7-4fe6-a175-8f9e1f76d978 | |
| relation.isAuthorOfPublication | 467be022-fd9c-4549-aa48-48ebcc1098eb | |
| relation.isAuthorOfPublication.latestForDiscovery | 6663c3d3-4fe7-4fe6-a175-8f9e1f76d978 |
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