DETERMINAÇÃO DO HERBICIDA PARAQUAT SOBRE ELETRODOS DE GRAFITE PIROLÍTICO MODIFICADOS COM FTALOCIANINA DE COBALTO UTILIZANDO VOLTAMETRIA DE ONDA QUADRADA
Determination of paraquat (PQ) in watery solutions was investigated with the technique of wave square voltammetry on pyrolytic graphite electrodes (PG) before and after modifications with metal phtalocyanines. The electrode modified with cobalt phthalocyanine (CoPc) presented PQ reduction currents m...
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| Format: | master thesis |
| Status: | Published version |
| Publication Date: | 2006 |
| Country: | Brasil |
| Institution: | Universidade Federal do Maranhão (UFMA) |
| Repository: | Biblioteca Digital de Teses e Dissertações da UFMA |
| Language: | Portuguese |
| OAI Identifier: | oai:tede2:tede/932 |
| Online Access: | http://tedebc.ufma.br:8080/jspui/handle/tede/932 |
| Access Level: | Open access |
| Keyword: | Paraquat grafite pirolítico ftalocianina de cobalto pyrolytic graphite cobalt phthalocyanine CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA |
| Summary: | Determination of paraquat (PQ) in watery solutions was investigated with the technique of wave square voltammetry on pyrolytic graphite electrodes (PG) before and after modifications with metal phtalocyanines. The electrode modified with cobalt phthalocyanine (CoPc) presented PQ reduction currents more accented and voltammetrics profiles better with respect to the electrodes unmodified and modified with nickel phthalocyanine (NiPc), iron (FePc), manganese (MnPc) and in the acid form (H2Pc). This sensor presented two reversible peaks for the reduction of PQ next to - 0,71 V (peak 1) and - 1,10 V (peak 2) versus S C E. After optimization of cobalt phthalocyanine concentration and the adsorption time on electrode, the best analysis conditions for the PQ in 0,10 mol L-1 Britton-Robinson buffer solution (pH 7,0) was established: frequency of 100 s-1, wave amplitude of 50 mV and scan increment of 2 mV. In these conditions, the modified electrode obtained a linear response range from 5,00 x 10-7 to 2.91 x 10-5 mol L-1 (128,59 to 748,36 x 101 μg L-1) with detection and quantification limits equals to 1,44 x 10-7 mol L-1 (37,03 μg L-1) and 4,79 x 10-7 mol L-1 (123,26 μg L-1)1, respectively. The studied sensor presented values below 5%, in terms of relative standard deviation, for repeatability (0,58% (± 0,27) for N = 10) and reproducibility (1,58% (± 0,74) for N = 5) studies. The sensor was applied in natural water samples and the gotten results was presented recovery averages of 93,14% (± 7,16) and 119,25% (± 5,68) in two water samples analyzed. |
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