Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS
In this work is proposed a solid phase preconcentration system of Co 2+ ions and its posterior determination by GFAAS in which fractional factorial design and response surface methodology (RSM) were used for optimization of the variables associated with preconcentration system performance. The metho...
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| Format: | Article |
| Language: | English |
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Universidade Estadual Paulista
2018-05-01
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| Series: | Eclética Química |
| Online Access: | https://revista.iq.unesp.br/ojs/index.php/ecletica/article/view/453 |
| _version_ | 1818579994486505472 |
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| author | Geraldo D. Matos César Ricardo Teixeira Tarley Sergio L. C. Ferreira Marco Aurélio Zezzi Arruda |
| author_facet | Geraldo D. Matos César Ricardo Teixeira Tarley Sergio L. C. Ferreira Marco Aurélio Zezzi Arruda |
| author_sort | Geraldo D. Matos |
| collection | DOAJ |
| description | In this work is proposed a solid phase preconcentration system of Co 2+ ions and its posterior
determination by GFAAS in which fractional factorial design and response surface methodology (RSM)
were used for optimization of the variables associated with preconcentration system performance. The
method is based on cobalt extraction as a complex Co 2+ -PAN (1:2) in a mini-column of polyurethane foam
(PUF) impregnated with 1-(2-pyridylazo)-naphthol (PAN) followed by elution with HCl solution and its
determination by GFAAS. The chemical and flow variables studied were pH, buffer concentration, eluent
concentration and preconcentration and elution flow rates. Results obtained from fractional factorial
design 2 5-1 showed that only the variables pH, buffer concentration and interaction (pH X buffer
concentration) based on analysis of variance (ANOVA) were statistically significant at 95% confidence
level. Under optimised conditions, the method provided an enrichment factor of 11.6 fold with limit of
detection and quantification of 38 and 130 ng L -1 , respectively, and linear range varying from 0.13 to 10
μg L -1 . The precision (n = 9) assessed by relative standard deviation (RSD) was respectively 5.18 and
2.87% for 0.3 and 3.0 μg L -1 cobalt concentrations. |
| first_indexed | 2024-12-16T07:10:33Z |
| format | Article |
| id | doaj.art-cd7e362f0e2549098a018960d9f83535 |
| institution | Directory Open Access Journal |
| issn | 1678-4618 |
| language | English |
| last_indexed | 2024-12-16T07:10:33Z |
| publishDate | 2018-05-01 |
| publisher | Universidade Estadual Paulista |
| record_format | Article |
| series | Eclética Química |
| spelling | doaj.art-cd7e362f0e2549098a018960d9f835352022-12-21T22:39:55ZengUniversidade Estadual PaulistaEclética Química1678-46182018-05-01301657410.26850/1678-4618eqj.v30.1.2005.p65-74453Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAASGeraldo D. Matos0César Ricardo Teixeira Tarley1Sergio L. C. Ferreira2Marco Aurélio Zezzi Arruda3Departamento de Química Analítica, Universidade Estadual de Campinas (Unicamp), Campus Universitário Zeferino Vaz, P.O. Box, 6154, 13084-971, Campinas, São Paulo, BrasilDepartamento de Química Analítica, Universidade Estadual de Campinas (Unicamp), Campus Universitário Zeferino Vaz, P.O. Box, 6154, 13084-971, Campinas, São Paulo, BrasilDepartamento de Química Analítica, Universidade Federal da Bahia (UFBA), Campus Universitário da Ondina, 40170-290, Salvador, Bahia, BrasilDepartamento de Química Analítica, Universidade Estadual de Campinas (Unicamp), Campus Universitário Zeferino Vaz, P.O. Box, 6154, 13084-971, Campinas, São Paulo, BrasilIn this work is proposed a solid phase preconcentration system of Co 2+ ions and its posterior determination by GFAAS in which fractional factorial design and response surface methodology (RSM) were used for optimization of the variables associated with preconcentration system performance. The method is based on cobalt extraction as a complex Co 2+ -PAN (1:2) in a mini-column of polyurethane foam (PUF) impregnated with 1-(2-pyridylazo)-naphthol (PAN) followed by elution with HCl solution and its determination by GFAAS. The chemical and flow variables studied were pH, buffer concentration, eluent concentration and preconcentration and elution flow rates. Results obtained from fractional factorial design 2 5-1 showed that only the variables pH, buffer concentration and interaction (pH X buffer concentration) based on analysis of variance (ANOVA) were statistically significant at 95% confidence level. Under optimised conditions, the method provided an enrichment factor of 11.6 fold with limit of detection and quantification of 38 and 130 ng L -1 , respectively, and linear range varying from 0.13 to 10 μg L -1 . The precision (n = 9) assessed by relative standard deviation (RSD) was respectively 5.18 and 2.87% for 0.3 and 3.0 μg L -1 cobalt concentrations.https://revista.iq.unesp.br/ojs/index.php/ecletica/article/view/453 |
| spellingShingle | Geraldo D. Matos César Ricardo Teixeira Tarley Sergio L. C. Ferreira Marco Aurélio Zezzi Arruda Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS Eclética Química |
| title | Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS |
| title_full | Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS |
| title_fullStr | Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS |
| title_full_unstemmed | Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS |
| title_short | Use of experimental design in the optimisation of a solid phase preconcentration system for Cobalt determination by GFAAS |
| title_sort | use of experimental design in the optimisation of a solid phase preconcentration system for cobalt determination by gfaas |
| url | https://revista.iq.unesp.br/ojs/index.php/ecletica/article/view/453 |
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