TITLE

Quantification of refractory organic substances in freshwaters: further insight into the response of the voltammetric method

AUTHOR(S)
Quentel, François; Filella, Montserrat
PUB. DATE
November 2008
SOURCE
Analytical & Bioanalytical Chemistry;Nov2008, Vol. 392 Issue 6, p1225
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A recently published method for quantifying refractory organic matter (often referred to as humic substances) in freshwaters was applied to a wide range of International Humic Substance Society (IHSS) humic compounds in order to (i) gain a better understanding of the mechanism of the voltammetric response which is the basis of the analytical method and (ii) provide guidance on choosing the optimal standard to be used. At the same time, the sensitivity of the technique has been increased by switching from the pulse mode initially proposed to the square-wave mode. The results obtained show that (i) differences in adsorption onto the electrode rather than differences in complexation strength are responsible for the differences in the intensity of the signal obtained for the different humic compounds, (ii) carboxylate, N- and S-containing groups do not play a role in the voltammetric signal.
ACCESSION #
34940168

 

Related Articles

  • Refraction by Earth's atmosphere. Schaefer, B.E. // Sky & Telescope;Mar89, Vol. 77 Issue 3, p311 

    Discusses astronomical refraction: How a ray of starlight is slightly bent when it passes through the Earth's atmosphere. Gives a computer program for correcting astrometric observations of star positions.

  • Saturn's Colorful Mystery. Dobbins, Thomas A.; Heath, Alan; Dikarev, Valeri // Sky & Telescope;Jan2003, Vol. 105 Issue 1, p106 

    Discusses the uncovered information of planet Saturn. Description of the bicolored aspects; Occurrence of differential refraction; Discovery of a well-established quadruple brightness.

  • Characterization of heteroepitaxial Na0.5K0.5NbO3/La0.5Sr0.5CoO3 electro-optical cell. Khartsev, S. I.; Grishin, M. A.; Grishin, A. M. // Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p062901 

    Heteroepitaxial Na0.5K0.5NbO3(1.5 μm)/La0.5Sr0.5CoO3(0.5 μm) (NKN/LSCO) films were grown on an Al2O3(011_2) single crystal (r-cut sapphire) by rf-magnetron sputtering (NKN) and pulsed laser deposition (LSCO) techniques. Prism coupling waveguide refractometry has been employed to...

  • isotropic.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p1241 

    Definitions of the term "isotropic," which refers to possessing similar qualities in every direction or having equal refraction, are presented.

  • Photorefractive effects in LiNbO3 channel waveguides: Model and experimental verification. Becker, R. A.; Williamson, R. C. // Applied Physics Letters;11/15/1985, Vol. 47 Issue 10, p1024 

    Photorefractive effects in Ti-indiffused LiNbO3 channel waveguides at λ=0.85 μm are modeled and the theoretical predictions are experimentally verified. This model allows, for the first time, the quantitative prediction of the magnitudes and time evolution of photorefractive effects in...

  • Photorefractive effect in annealed proton-exchanged LiNbO[sub 3]waveguides. Fujiwara, Takumi; Xiaofan Cao // Applied Physics Letters;8/17/1992, Vol. 61 Issue 7, p743 

    Compares photorefractive effect in proton-exchanged and annealed proton-exchanged (APE) LiNbO[sub 3] optical waveguides. Measurement of the intensity dependence of the saturated index change; Increase of photorefractive sensitivity in APE waveguides; Effect of annealing on the photorefractive...

  • Model for photoinduced defects and photorefractivity in optical fibers. Abdulhalim, I. // Applied Physics Letters;6/12/1995, Vol. 66 Issue 24, p3248 

    Proposes a model for the kinetics of photoinduced defects and photorefractivity in germanosilicate optical fibers. Existence of short-lived large energy fluctuation of material atoms; Stabilization of created defect by transient traps produced for carriers; Mechanism responsible for...

  • Optical characterization of a laser dye in a solid state host. Sardar, Dhiraj K.; Yow, Raylon M.; Mayo, Michael L. // Journal of Applied Physics;6/15/2001, Vol. 89 Issue 12, p7739 

    The optical properties of C[sub 18]H[sub 16]N[sub 2]O[sub 2]B[sub 2]F[sub 4]H[sub 2]O, an organic laser dye embedded in solid plastic host, have been characterized for a number of laser wavelengths in the visible region. The index of refraction of the dye in plastic host is measured by the...

  • diopter.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p656 

    A definition of the term "diopter" which refers to a unit of measurement in refraction is presented.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics