Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas
In this work a micro-heater device to be used as an integral part of the flow analysis manifold is described. The usefulness of the device was demonstrated using it in the development of a multicommutated flow analysis procedure for the spectrophotometric determination of manganese in plant digest....
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2004-01-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000100010 |
| _version_ | 1818061585761959936 |
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| author | Smiderle Marisa Tomazzini Maria Cristina Reis Boaventura F. |
| author_facet | Smiderle Marisa Tomazzini Maria Cristina Reis Boaventura F. |
| author_sort | Smiderle Marisa |
| collection | DOAJ |
| description | In this work a micro-heater device to be used as an integral part of the flow analysis manifold is described. The usefulness of the device was demonstrated using it in the development of a multicommutated flow analysis procedure for the spectrophotometric determination of manganese in plant digest. The method was based on the manganese oxidation by periodate in phosphoric acid medium to form the permanganate anion. The reaction development is dependent on the temperature and it was observed that at 25 °C a time interval of ca. 15 min was necessary for the reaction to attain equilibrium. Setting the temperature to 70 ºC, this time interval could be decreased to ca. 30 s. This condition was easily attained employing the proposed micro-heater device coupled to the manifold. The procedure was applied to manganese determination in soybean digests and results compared with those obtained by inductively coupled argon plasma optical emission spectrometry (ICP-OES). No significant difference at 90% confidence level was observed. A linear response for sample concentrations ranging from 5.0 to 30.00 mg L-1 Mn2+; a relative standard deviation of 1.3% (n = 6) for a typical sample containing 6.3 mg L-1 Mn2+; a sampling rate of 22 determinations per hour; a low reagent consumption, of 12.0 mg NaIO4 per determination; and a detection limit of 1.2 mg L-1 were achieved. |
| first_indexed | 2024-12-10T13:50:39Z |
| format | Article |
| id | doaj.art-2f3a88e7cdd04ce2bb36877aa9629979 |
| institution | Directory Open Access Journal |
| issn | 0100-4042 1678-7064 |
| language | English |
| last_indexed | 2024-12-10T13:50:39Z |
| publishDate | 2004-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-2f3a88e7cdd04ce2bb36877aa96299792022-12-22T01:46:12ZengSociedade Brasileira de QuímicaQuímica Nova0100-40421678-70642004-01-012715054Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantasSmiderle MarisaTomazzini Maria CristinaReis Boaventura F.In this work a micro-heater device to be used as an integral part of the flow analysis manifold is described. The usefulness of the device was demonstrated using it in the development of a multicommutated flow analysis procedure for the spectrophotometric determination of manganese in plant digest. The method was based on the manganese oxidation by periodate in phosphoric acid medium to form the permanganate anion. The reaction development is dependent on the temperature and it was observed that at 25 °C a time interval of ca. 15 min was necessary for the reaction to attain equilibrium. Setting the temperature to 70 ºC, this time interval could be decreased to ca. 30 s. This condition was easily attained employing the proposed micro-heater device coupled to the manifold. The procedure was applied to manganese determination in soybean digests and results compared with those obtained by inductively coupled argon plasma optical emission spectrometry (ICP-OES). No significant difference at 90% confidence level was observed. A linear response for sample concentrations ranging from 5.0 to 30.00 mg L-1 Mn2+; a relative standard deviation of 1.3% (n = 6) for a typical sample containing 6.3 mg L-1 Mn2+; a sampling rate of 22 determinations per hour; a low reagent consumption, of 12.0 mg NaIO4 per determination; and a detection limit of 1.2 mg L-1 were achieved.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000100010multicommutated flow systemmicro-heater devicemanganese determination |
| spellingShingle | Smiderle Marisa Tomazzini Maria Cristina Reis Boaventura F. Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas Química Nova multicommutated flow system micro-heater device manganese determination |
| title | Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas |
| title_full | Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas |
| title_fullStr | Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas |
| title_full_unstemmed | Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas |
| title_short | Desenvolvimento de um micro-aquecedor para sistemas de análise química em fluxo: determinação espectrofotométrica de manganês em plantas |
| title_sort | desenvolvimento de um micro aquecedor para sistemas de analise quimica em fluxo determinacao espectrofotometrica de manganes em plantas |
| topic | multicommutated flow system micro-heater device manganese determination |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000100010 |
| work_keys_str_mv | AT smiderlemarisa desenvolvimentodeummicroaquecedorparasistemasdeanalisequimicaemfluxodeterminacaoespectrofotometricademanganesemplantas AT tomazzinimariacristina desenvolvimentodeummicroaquecedorparasistemasdeanalisequimicaemfluxodeterminacaoespectrofotometricademanganesemplantas AT reisboaventuraf desenvolvimentodeummicroaquecedorparasistemasdeanalisequimicaemfluxodeterminacaoespectrofotometricademanganesemplantas |