Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 62, Issue -, Pages 123-129Publisher
ELSEVIER
DOI: 10.1016/j.msec.2016.01.020
Keywords
Carbon paste electrode; Antimony microparticles; Biochar; Paraquat
Categories
Funding
- CAPES
- CNPq [454594/2014-3, 304701/2014-9, 304640/2014-0, 478128/2012-6]
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This work describes the construction and application of carbon paste electrodes modified with biochar and antimony microparticles (SbBCPE) for voltammetric determination of paraquat using a simple and sensitive procedure based on voltammetric stripping analysis. Some parameters such as amount of biochar and antimony used in the composition of the carbon paste and instrumental parameters were examined in detail. Under optimized conditions, an analytical curve was obtained for paraquat determination employing SbBCPE, which showed a linear response ranging from 0.2 to 2.9 mu mol L-1, with limit of detection and quantification of 34 nmol L-1 and 113 nmol L-1, respectively, after paraquat pre-concentration of 120 s. The repeatability study presented a RSD = 2.0% for 10 consecutive measurements using the same electrode surface and the reproducibility study showed a RSD = 2.7% for measurements with 10 different electrode surfaces. The proposed sensor was successfully applied for paraquat determination in tap water and citric fruit juice spiked samples and good recoveries were obtained without any sample pre-treatment, showing its promising analytical performance. (C) 2016 Elsevier B.V. All rights reserved.
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