TY - JOUR
T1 - High sensitivity thermal lens microscopy
T2 - Cr-VI trace detection in water
AU - Cedeño, E.
AU - Cabrera, H.
AU - Delgadillo-López, A. E.
AU - Delgado-Vasallo, O.
AU - Mansanares, A. M.
AU - Calderón, A.
AU - Marín, E.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - 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 μg/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 (~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 colorimetric method.
AB - 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 μg/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 (~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 colorimetric method.
KW - Hexavalent chromium
KW - Photothermal
KW - Spectroscopy
KW - Thermal lens effect
KW - Thermal lens microscope
UR - http://www.scopus.com/inward/record.url?scp=85017535324&partnerID=8YFLogxK
U2 - 10.1016/j.talanta.2017.04.008
DO - 10.1016/j.talanta.2017.04.008
M3 - Artículo
C2 - 28501168
SN - 0039-9140
VL - 170
SP - 260
EP - 265
JO - Talanta
JF - Talanta
ER -