6533b827fe1ef96bd1285dda
RESEARCH PRODUCT
EDTA excess Zn(II) back-titration in the presence of 4-(2-pyridylazo)-resorcinol indicator and naphthol green beta as inert dye for determining Cr(III) as Cr(III)/EDTA complex: application of the method to a leather industry wastewater.
M. VeneziaLeonardo PalmisanoG Alonzosubject
ChromiumEnvironmental EngineeringHealth Toxicology and Mutagenesischemistry.chemical_elementIndustrial WasteZincResorcinolNaphtholsWaste Disposal FluidComplexometric titrationlaw.inventionWater PurificationChromiumchemistry.chemical_compoundlawEnvironmental ChemistryColorimetryColoring AgentsWaste Management and DisposalEdetic AcidModels StatisticalResorcinolsPollutionZincchemistryWastewaterModels ChemicalEnvironmental chemistryCalciumAtomic absorption spectroscopyWater Pollutants ChemicalNuclear chemistryWaste disposaldescription
The colour changes of 4-(2-pyridylazo)-resorcinol and naphthol green beta as new screening metallochromic indicator in back-titration of EDTA excess with Zn(II) to determine Cr(III)/EDTA complex was investigated with the help of tristimulus colorimetry. Specific colour discrimination (SCD) and L*, a*, b* 1976 parameters were successfully applied to evaluate the quality of colour transition at the end-point in non-alkaline media and in the presence of Zn(II) and Ca(II) which resulted in non-interfering species at 1x10(-3) M and 2x10(-3) M, respectively. The above concentrations are comparable with those used for Cr(III). Validation of the fast and accurate reported method was performed by atomic absorption spectroscopy. Moreover, the method was applied for determining Cr as Cr(III) in a wastewater effluent deriving from a leather industry.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-11-28 | Journal of hazardous materials |