Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation
A spectrophometric method for the determination of Cr(III) with 4-(2- thiazolylazo)-resorcinol was developed. Cr(III) slowly forms a red complex with TAR at pH 5.7. Irradiating the reacting mixture with microwave energy can accelerate the complex formation. The absorbance reached its maximum with 5...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2004-01-01
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| Series: | Journal of the Brazilian Chemical Society |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000100025 |
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| author | Carvalho Luciene S. de Costa Antônio Celso S Ferreira Sérgio L. C Teixeira Leonardo S. G |
| author_facet | Carvalho Luciene S. de Costa Antônio Celso S Ferreira Sérgio L. C Teixeira Leonardo S. G |
| author_sort | Carvalho Luciene S. de |
| collection | DOAJ |
| description | A spectrophometric method for the determination of Cr(III) with 4-(2- thiazolylazo)-resorcinol was developed. Cr(III) slowly forms a red complex with TAR at pH 5.7. Irradiating the reacting mixture with microwave energy can accelerate the complex formation. The absorbance reached its maximum with 5 min of irradiation and remained stable, at least, for 24 h. N-cetyl-N,N,N-trimethylammonium bromide (CTAB) was used for increasing the sensitivity and solubility of the system. The method allowed the determination of chromium ranging from 0.050 to 3.0 mg mL-1 (9.62 x 10-7 to 5.77 x 10-5 mol L-1) with a molar absorptivity of 2.73x10(4) L-1 mol-1 cm-1 and a detection limit of 17 ng mL-1 (3.3 x 10-7 mol L-1) at 545 nm. The selectivity was improved by using EDTA and citrate as masking agents. Fe(III) interferes and must be extracted previously, if present in the sample. The proposed method has been successfully applied to the determination of chromium in steel. The precision (R.S.D. < 2%) and accuracy were satisfactory. |
| first_indexed | 2024-12-21T13:42:56Z |
| format | Article |
| id | doaj.art-ef2b5bca58c64bc5af65f7c1d426f602 |
| institution | Directory Open Access Journal |
| issn | 0103-5053 |
| language | English |
| last_indexed | 2024-12-21T13:42:56Z |
| publishDate | 2004-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Journal of the Brazilian Chemical Society |
| spelling | doaj.art-ef2b5bca58c64bc5af65f7c1d426f6022022-12-21T19:01:58ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50532004-01-01151153157Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiationCarvalho Luciene S. deCosta Antônio Celso SFerreira Sérgio L. CTeixeira Leonardo S. GA spectrophometric method for the determination of Cr(III) with 4-(2- thiazolylazo)-resorcinol was developed. Cr(III) slowly forms a red complex with TAR at pH 5.7. Irradiating the reacting mixture with microwave energy can accelerate the complex formation. The absorbance reached its maximum with 5 min of irradiation and remained stable, at least, for 24 h. N-cetyl-N,N,N-trimethylammonium bromide (CTAB) was used for increasing the sensitivity and solubility of the system. The method allowed the determination of chromium ranging from 0.050 to 3.0 mg mL-1 (9.62 x 10-7 to 5.77 x 10-5 mol L-1) with a molar absorptivity of 2.73x10(4) L-1 mol-1 cm-1 and a detection limit of 17 ng mL-1 (3.3 x 10-7 mol L-1) at 545 nm. The selectivity was improved by using EDTA and citrate as masking agents. Fe(III) interferes and must be extracted previously, if present in the sample. The proposed method has been successfully applied to the determination of chromium in steel. The precision (R.S.D. < 2%) and accuracy were satisfactory.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000100025chromiumTARspectrophotometricmicrowave radiationsteel |
| spellingShingle | Carvalho Luciene S. de Costa Antônio Celso S Ferreira Sérgio L. C Teixeira Leonardo S. G Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation Journal of the Brazilian Chemical Society chromium TAR spectrophotometric microwave radiation steel |
| title | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation |
| title_full | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation |
| title_fullStr | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation |
| title_full_unstemmed | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation |
| title_short | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation |
| title_sort | spectrophotometric determination of chromium in steel with 4 2 thiazolylazo resorcinol tar using microwave radiation |
| topic | chromium TAR spectrophotometric microwave radiation steel |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000100025 |
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