Uso do violeta de alizarina N (AVN) como reagente espectrofotométrico na determinação de alumínio Use of the alizarine violet N (AVN) as a spectrophotometric reagent for aluminium determination
| Autor: | Alailson Falcão Dantas, Antônio Celso Spínola Costa, Sérgio Luís Costa Ferreira |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 23, Iss 2, Pp 155-160 (2000) |
| Druh dokumentu: | article |
| ISSN: | 0100-4042 1678-7064 |
| DOI: | 10.1590/S0100-40422000000200003 |
| Popis: | The present work proposes the application of the 4-Hidroxy-3-(2-hydroxynaphtylazo)-benzenesulphonic acid (C.I. 15670), Alizarine Violet N (AVN), as a reagent for direct aluminium determination using molecular absorption spectrophotometry in the presence of tensoatives. Al(III) cation reacts with AVN in pH 9.4, forming a red complex, stable for at least 24 hours, with absorption minimum at 607nm and, against a reagent blank, (epsiloncomplex - epsilonreagent) = -2.71x10(4) L.mol-1.cm-1. The reaction occurs in the presence of a Triton-X100 and CTAB tensoatives mixture, in the presence of EDTA. Al(III) determination is possible in the linear range of 50 up to 400ng.mL-1, with a detection limit of 41 ng.mL-1. |
| Databáze: | Directory of Open Access Journals |
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