title: Use of diffuse reflectance spectrometry in spot test reactions for quantitative determination of cations in water.
abstract: Diffuse reflectance spectroscopy can be successfully used for the quantitative determination of small amounts of pollutants like metals. The remission function was found to be linearly proportional to the concentration, when we applied the Kubelka-Munk equation. The color reactions of Cu(II), Co(II), and Ni(II) with dithiooxamide, were realised on filter paper. Reaction between Fe(III) and ammonium thiocyanate was realized on filter paper and gelatine matrix. All measurements were accomplished with a laboratory-constructed reflectometer. We have obtained a calibration curve by plotting the optical density of reflectance A(R) vs log of the mol l(-1) concentration. Limits of detection at the 10(-4) M level were estimated for all the compounds. Linear dynamic range extend over one order of magnitude and shows the potential of device for the quantitative analysis of environmental pollutants.
authors.affiliation: Laboratory of Chemical and Environmental Engineering, University of Savoy, Le Bourget du Lac, France. antoine.ghauch@procyon.univ-savoie.fr
authors.forename: A
authors.initials: A
authors.lastname: Ghauch
authors.forename: C
authors.initials: C
authors.lastname: Turnar
authors.forename: C
authors.initials: C
authors.lastname: Fachinger
authors.forename: J
authors.initials: J
authors.lastname: Rima
authors.forename: A
authors.initials: A
authors.lastname: Charef
authors.forename: J
authors.initials: J
authors.lastname: Suptil
authors.forename: M
authors.initials: M
authors.lastname: Martin-Bouyer
mesh_terms: D002412:Cations / Q000032:analysis* / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis / Q000737:chemistry; D003300:Copper / Q000032:analysis / Q000737:chemistry; D005069:Evaluation Studies as Topic; D005780:Gelatin / Q000737:chemistry; D007202:Indicators and Reagents / Q000737:chemistry; D007501:Iron / Q000032:analysis / Q000737:chemistry; D009532:Nickel / Q000032:analysis / Q000737:chemistry; D010209:Paper; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*; D013854:Thioamides / Q000737:chemistry; D013861:Thiocyanates / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D002412:Cations; D007202:Indicators and Reagents; D013854:Thioamides; D013861:Thiocyanates; D014867:Water; D003035:Cobalt; D003300:Copper; D009532:Nickel; D005780:Gelatin; C026976:thiocyanic acid; D007501:Iron; C005728:rubeanic acid