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ARTICLES >>Copper-complexation index as a polarographic summation parameter for the determination of chelating agents in water
Copper-complexation index as a polarographic summation parameter for the determination of chelating agents in water
Abstract
Polarography of the copper(II)-complexes of chelating agents is shown to be a suitable basis for a sum- mation parameter for the total concentration of these chemicals in water (expressed as the copper-complexation index). Using 12 chelating agents (ATMP, BAED, CDTA, DTPA, DTPMP, EDTA, EDTMP, EDTP, EGTA, HEDP, NTA, PBTCA ) all listed in DIN 38409-H26 and DIN 38413-P5 a satisfactory reproducibility of the method used was obtained. In addition several commercial tensides, detergents in washing and deliming products were investigated.
Glossary of abbreviations
- ATMP Amino-tri-methylenephosphonic acid
- BAED N,N-Bis(carboxymethylene)-1-aminoethene-1,1-diphosphonic acid
- CDTA Cyclohexane-dinitrilo-(1,2)-tetraacetic acid
- DTPA Diethyltrinitrilopentaacetic acid
- DTPMP Diethylene-triaminepenta-(methylenephosphonic acid)
- EDTA Ethylenediamine-tetraacetic acid
- EDTMP Ethylenediaminetetramethylene-phosphonic acid
- EDTP Ethylenediamine-N,N,N,N-tetra-2-propanol
- EGTA Bis(aminoethyl)-glycolether-N,N,N,N-tetraacetic acid
- HEDP Hydroxyethene-1,1-diphosphonic acid
- NTA Nitrilotriacetic acid
- PBTCA 2-Phosphonobutane-1,2,4-tricarbonic acid
Copper-complexation index as a polarographic summation parameter for the determination of chelating agents in water