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Type: Artigo
Title: High sensitivity thermal lens microscopy: Cr-VI trace detection in water
Author: Cedeño, E.
Cabrera, H.
Delgadillo-López, A. E.
Delgado-Vasallo, O.
Mansanares, A. M.
Calderón, A.
Marín, E.
Abstract: In this work, a low detection limit for hexavalent chromium in water of parts per trillions (21 ng/L) was achieved using a micro -spatial thermal lens spectroscopy setup with coaxial counter -propagating pump and probe laser beams and an integrated passive optical Fabry-Perot resonator, aided with a well -established diphenyl carbazide colorimetric method. Cr-VI concentrations in the range of mu g/L, i.e. well -below the toxicity thresholds in humans and animals (26 and 190 mg/L respectively) and below those delimited by international regulations for drink water (similar to 0.05-0.5 mg/L), have been obtained by measurements in bottled and tap water samples. The developed thermal lens microscope is also capable to detect Cr-VI directly in potassium dichromate solutions using pump beam wavelengths within the very low optical absorption region in the visible part of the spectrum, i.e., without the use of any calorimetric method.
Subject: Lente térmica
Fabry-Perot, Interferômetros de
Absorção da luz
Thermal lens
Fabry-Perot interferometers
Light absorption
Country: Holanda
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2017.04.008
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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