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Type: Artigo de periódico
Title: Evaluation Of Dmit [4,5-dimercapto-1,3-dithyol-2-thionate] As Chelating Agent In A Cloud Point Extraction Procedure For Pb2+ Determination In Water Samples [avaliação Do Dmit [4,5-dimercapto-1,3-ditiol-2-tionato] Como Agente Complexante Em Um Procedimento De Extração Por Ponto Nuvem Para Determinação De Pb2+ Em Amostras De água]
Author: Godoy N.V.
Somera B.F.
Barreto W.J.
Barreto S.R.G.
Tarley C.R.T.
Abstract: The present study proposes a new method for cloud point preconcentration of Pb2+ ions based on complex formed with [4,5-dimercapto-1,3-dithyol-2-thionate] and posterior determination by flame atomic absorption spectrometry (FAAS). The preconcentration of Pb2+ was carried at pH 5.0 under following conditions: time and temperature of batch at 15 min. and 70oC, respectively, 0.1% (v/v) Triton X-114, 0.003 mol L-1 acetate/acetic acid buffer solution, 1.0 x 10-5 mol L-1 DMIT and 0.5% (m/v) NaCl. Under the best analytical conditions the method provided a limit of detection of 2.85 μg L-1 by preconcentrating 10.0 mL of sample and calibration curve ranging from 0 up to 650 μg L-1 (r = 0.99945). The applicability of proposed method for Pb2+ determination in natural waters without interferences was checked through addition/recovery tests.
Rights: aberto
Identifier DOI: 10.4025/actascitechnol.v35i2.18076
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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