TITLE

Direct determination of copper in urine using a sol-gel optical sensor coupled to a multicommutated flow system

AUTHOR(S)
Jeronimo, Paula C. A.; Araüjo, Alberto N.; Montenegro, M. Conceição B. S. M.; Pasquini, Celio; Raimundo Jr., Ivo M.
PUB. DATE
September 2004
SOURCE
Analytical & Bioanalytical Chemistry;Sep2004, Vol. 380 Issue 1, p108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this work, a multicommutaled flow system incorporating a sol-gel optical sensor is proposed for direct spectrophotometric determination of Cu(II) in urine. The optical sensor was developed by physical entrapment of 4-(2-pyridylazo)resorcinol (PAR) in sol-gel thin films by means of a base-catalysed process. The immobilised PAR formed a red 2:1 complex with Cu(II) with maximum absorbance at 500 nm. Optical transduction was based on a dual-colour light-emitting diode (LED) (green/red) light source and a photodiode detector. The sensor had optimum response and good selectivity towards Cu(II) at pH 7.0 and its regeneration was accomplished with picolinic acid. Linear response was obtained for Cu(II) concentrations between 5.0 and 80.0 μg L-1, with a detection limit of 3.0 μg L-1 and sampling frequency of 14 samples h-1 Interference from foreign ions was studied at a 10:1 (w/w) ion:Cu(II) ratio. Results obtained from analysis of urine samples were in very good agreement with those obtained by inductively coupled plasma mass spectrometry (ICP-MS); there was no significant differences at a confidence level of 95%.
ACCESSION #
14392606

 

Related Articles

  • Enhanced coupling of light from organic light emitting diodes using nanoporous films. Peng, H. J.; Ho, Y. L.; Yu, X. J.; Kwok, H. S. // Journal of Applied Physics;8/1/2004, Vol. 96 Issue 3, p1649 

    We have demonstrated an approach to enhance the light extraction efficiency for organic light emitting diode (OLED). Nanoporous alumina film was used to modify the optical wave propagation and coupling of light from the OLED. Experimental results showed an increase of over 50% in the coupling...

  • A white-lighting LED system with a highly efficient thin luminous film. Mingzhu Li; Qing Liao; Ye Liu; Zhiyuan Li; Jingxia Wang; Lei Jiang; Yanlin Song // Applied Physics A: Materials Science & Processing;Jan2010, Vol. 98 Issue 1, p85 

    In this work, a highly effective white light-emitting diode (LED) system is realized by a combination of an LED and a photonic crystal (PC-) structured luminous film. The emission intensity of the PC-structured luminous film emission is enhanced by a factor of ca. 10.6 compared with that of the...

  • A REVIEW ON IMPROVEMENT OF LED LIGHT EXTRACTION EFFICIENCY THROUGH A MICRO REPEATING STRUCTURE. Joshua Gan; Ramakrishnan, Sivakumar; Fei Yee Yeoh // Reviews on Advanced Materials Science;2015, Vol. 42 Issue 1, p92 

    This paper explains the method used by researchers to improve Light Emitting Diode (LED) extraction efficiency. It also summarizes the works of different researchers on the improvement in light extraction efficiency (LEE) of an LED. In current practice, a commonality was observed where many...

  • Improved Light Extraction Efficiency by Photonic Crystal Arrays on Transparent Contact Layer Using Focused Ion Beams. Wu, G. M.; Tsai, B. H.; Kung, S. F.; Wu, C. F. // Acta Physica Polonica, A.;Jul2011, Vol. 120 Issue 1, p140 

    Nitride-based thin-film materials have become increasingly important for the high brightness light-emitting diode applications. The improvements in light extraction and lower power consumption are highly desired. Although the internal quantum efficiency of GaN-based LED has been relatively high,...

  • Rendering a color palette by light-emitting diodes. ZŽukauskas, A.; Vaicekauskas, R.; Ivanauskas, F.; Vaitkevicčius, H.; Shur, M. S. // Applied Physics Letters;7/14/2008, Vol. 93 Issue 2, p021109 

    We present a new approach to the optimization of sources of white light based on colored light-emitting diodes (LEDs) and show that a pentachromatic source composed of LEDs with the equidistant peak wavelengths at about 450, 500, 550, 600, and 650 nm renders all 1269 colors of the Munsell...

  • Indoor Positioning by LED Visible Light Communication and Image Sensors. Rahman, Mohammad Shaifur; Haque, Mejbaul; Ki-Doo Kim // International Journal of Electrical & Computer Engineering;2011, Vol. 1 Issue 2, p161 

    High power white LEDs are expected to replace the existing lighting technologies in near future which are also suggested for visible light communication (VLC). We proposed an algorithm for high precision indoor positioning using lighting LEDs, VLC and image sensors. In the proposed algorithm,...

  • Quantitative luminous efficiency determination for large-area light-emitting devices. Simbrunner, C.; Hernandez-Sosa, G.; Sitter, H. // Applied Physics A: Materials Science & Processing;Feb2010, Vol. 98 Issue 2, p337 

    During recent decades organic light-emitting devices became of increasing interest in many fields of applications. A broad spectrum of available organic molecules can be used to fabricate organic light-emitting diodes (OLEDs) emitting at various photon energies. One of the commonly used quality...

  • Light emitting diode as sensor for miniature multispectral radiometer. RayChaudhuri, B.; Sen, C. // Applied Physics B: Lasers & Optics;Apr2009, Vol. 95 Issue 1, p141 

    A methodology is proposed for studying the suitability of the light emitting diode (LED) as the optical sensor of a miniature multispectral radiometer. The optoelectronic properties of three commercially available LEDs of three different wavebands were standardized by measuring the open-circuit...

  • Vision + Automation PRODUCTS.  // Vision Systems Design;Nov2005, Vol. 10 Issue 11, p103 

    The article presents information on computer vision equipment. It includes the IR928+ camera system from Armstrong Optical, In-Sight 5400S stainless-steel vision sensor from Cognex and All Color Ultrabright light emitting diodes light source from PerkinElmer Optoelectronics.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics