A catalytic adsorptive stripping voltammetric procedure for trace determination of Cr(VI) in natural samples containing high concentrations of humic substances

Grabarczyk, Malgorzata
February 2008
Analytical & Bioanalytical Chemistry;Feb2008, Vol. 390 Issue 3, p979
Academic Journal
A simple and fast catalytic adsorptive stripping voltammetric procedure for trace determination of Cr(VI) in natural samples containing high concentrations of humic substances has been developed. The procedure for chromium determination in the presence of DTPA and nitrates was employed as the initial method. In order to enhance the selectivity vs. Cr(III) the measurements were performed at 40°C. Interference from dissolved organic matter such as humic and fulvic acids was drastically decreased by adding Amberlite XAD-7 resin to the voltammetric cell before the deaeration step. The whole procedure was applied to a single cell, which allowed monitoring of the voltammetric scan. Optimum conditions for removing humic and fulvic acids due to their adsorption on XAD-7 resin were evaluated. The use of XAD-7 resin also minimize interferences from various cationic, anionic, and nonionic surfactants. The calibration graph for Cr(VI) for an accumulation time of 30 s was linear in the range 5 × 10−10 to 5 × 10−8 mol L−1. The relative standard deviation for determination of Cr(VI) at a concentration of 1 × 10−8 mol L−1 was 3.5% ( n = 5). The detection limit estimated from 3 times the standard deviation for low Cr(VI) concentrations and an accumulation time of 30 s was about 1.3 × 10−10 mol L−1. The proposed method was successfully applied to Cr(VI) determination at trace levels in soil samples.


Related Articles

  • Simple Electrochemical Determination of Surface-Active Substances in Natural Waters. Cvrković-Karloci, Željka; Krznarić, Damir; Šeruga, Marijan; Ćosovic, Božena // International Journal of Electrochemistry;2011, p1 

    A simple electrochemical determination of surface-active substances by using time-dependent variation of the capacitive current in a.c. voltammetry at the HMDE is described. Surface-active substances were accumulated by stirring solution at the deposition potential of -0.6 V versus Ag/AgCl (sat....

  • A single parameter representation of hygroscopic growth and cloud condensation nucleus activity. Petters, M. D.; Kreidenweis, S. M. // Atmospheric Chemistry & Physics;2007, Vol. 7 Issue 8, p1961 

    We present a method to describe the relationship between particle dry diameter and cloud condensation nuclei (CCN) activity using a single hygroscopicity parameter κ. Values of the hygroscopicity parameter are between 0.5 and 1.4 for highly-CCN-active salts such as sodium chloride, between...

  • Fulvic-Acid-enhanced Biodegradation of Aquatic Contaminants Carey, J.; Liu, D.; Thomson, K. // Bulletin of Environmental Contamination & Toxicology;Aug1983, Vol. 31 Issue 2, p203 

    No abstract available.

  • Influences of organic compounds on the visible light induced photocatalytic reduction of Cr(VI). Zhang, Dongdong; Qiu, Rongliang; Wei, Aibin; Wang, Shizhong // Kinetics & Catalysis;Nov2014, Vol. 55 Issue 6, p793 

    The objective of this work is to study how the nature of organic compounds influences on the reduction of Cr(VI). The photocatalytic reduction of Cr(VI) was carried out in the presence of various organic compounds under visible light, a remarkable promotion effect on Cr(VI) reduction was...

  • Concentrations and Distributions of Metals Associated with Dissolved Organic Matter from the Suwannee River (GA, USA). Kuhn, Keshia M.; Neubauer, Elisabeth; Hofmann, Thilo; von der Kammer, Frank; Aiken, George R.; Maurice, Patricia A. // Environmental Engineering Science;Jan2015, Vol. 32 Issue 1, p54 

    Concentrations and distributions of metals in Suwannee River (SR) raw filtered surface water (RFSW) and dissolved organic matter (DOM) processed by reverse osmosis (RO), XAD-8 resin (for humic and fulvic acids [FA]), and XAD-4 resin (for 'transphilic' acids) were analyzed by asymmetrical flow...

  • Importance of Oleochemicals Emphasized at World Surfactants. de Guzman, Doris // Chemical Market Reporter;7/5/2004, Vol. 266 Issue 1, p14 

    Focuses on issues discussed during the Sixth World Surfactants Congress in Berlin, Germany. Emphasis of oleochemicals producers on the importance of oils and fat-based products; Increase in the use of oleochemicals in the surfactants market; Significance of oleochemicals in enabling...

  • Surfactants Update. Klebaur, Bridget // Coatings World;Mar2013, Vol. 18 Issue 3, p43 

    The article focuses on the key challenges being faced by surfactants manufacturers. 3M Advanced Materials' business manager Scott Hanson mentions that providing solutions for low or no volatile organic compound (VOC) formulations are the environmental challenges of surfactants market. Troy...

  • Surfactants in cloud droplet activation: mixed organic-inorganic particles. Prisle, N. L.; Raatikainen, T.; Laaksonen, A.; Bilde, M. // Atmospheric Chemistry & Physics;2010, Vol. 10 Issue 12, p5663 

    Organic compounds with surfactant properties are commonly found in atmospheric aerosol particles. Surface activity can significantly influence the cloud droplet forming ability of these particles. We have studied the cloud droplet formation by two-component particles comprising one of the...

  • One-step synthesis of Sb2O3 broom-like belts with controllable morphology. Qingrui Zhao; Xuanjun Zhang; Qing Yang; Yi Xie // Canadian Journal of Chemistry;Aug2005, Vol. 83 Issue 8, p1093 

    A direct and simple surfactant- and template-free route has been developed for the controlled synthesis of Sb2O3 belt-like microstructures. By adjusting the reactant ratio between SbCl3 and urea under solvothermal reaction conditions, broom-like belts and rods of Sb2O3 have been successfully...


Read the Article


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

Try another library?
Sign out of this library

Other Topics