pH-Spectrum of
EDTA-Calcium-Complex

Experimental:

System Ca - (1.0 mmol/L CaCl₂ / dist. water),
System (Ca+E) - (1.0 mmol/L CaCl₂ + 1.0 mmol/L EDTA / dist. water),
System (Ca+E)´ - (2.0 mmol/L CaCl₂ + 1.0 mmol/L EDTA / dist. water)

Results:

Fingerprint

System Ca: No formation of Ca-OH-complex in the pH range from 2 to 12 could be shown.

Systemprint

System (Ca+E): At pH 8.2 a EDTA-Ca complex is formed.

Systemprint with Additive, helps you to check the influence of an Additive

System (Ca+E)´: No additional peak appears.