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Chelating capacity and stability

Stability constants (logK values) – in active pH range
Metal ionEDTADTPAGLDAMGDAIDS
Al3+16.418.612.27.714.1
Ba2+7.88.63.54.83.4
Ca2+10.710.76.475.2
Cd2+16.518.99.110.68.4
Co2+16.518.810.011.110.5
Cu2+18.821.213.113.913.1
Fe2+14.316.58.78.18.2
Fe3+25.128.611.716.515.2
Hg2+21.526.414.3 14.9
Mg2+8.79.35.55.86.1
Mn2+13.915.27.68.47.7
Ni2+18.420.110.91212.2
Pb2+1818.810.512.111
Sr2+8.79.84.15.24.1
Zn2+16.518.210.01110.8
Ag1+    3.9
Cr3+    9.6
different active pH range: different logK in different pH
For each metal complex there is an optimum pH and an active pH range in which the metal complex is stable.
logK in active pH (different pH environment for different chelant/different metal ion)
different chelating ability in different pH
High AcidityLow acidityLow alkalinityHigh alkalinity
Divalent metalsGLDA, MGDA, EDTA, DTPA
Hardness
(Ca,Mg)
donnot need chelantsGLDA, MGDAGLDA, MGDA, EDTA, DTPA
Iron controlGLDA, MGDAGLDA, MGDA, EDTA, DTPADTPAsodium gluconate, Glucoheptonate
Applications:
Cleaning & detergents, Building & construction, Personal care & Cosmetics,Water treatment chemicals,Pulp and Paper making, Textile auxiliaries,Industrial cleaning, Metal plating & Electronics chemicals, Oilfield chemicals, Photography, etc.
recommended chelating agents for different pH

logK describes the chelating intensity, the chelating capacity below describes the quantity

Chelating capacity, as mg metal/g product
ProductAssay(wt%)CaCO3Ca2+Cu2+Fe3+Mg2+Mn2+Zn2+
GLDA47134538475337388
MGDA40147599382368197
EDTA39103416557255667
NTA401566299873885102
chelating capacity of GLDA, MGDA, EDTA, NTA
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