For AAS determination of calcium you can use Ready-to-use Calibration Sets:

CPA code No K007R - with concentrations: 1; 2; 5 mg/l and

CPA code No K007S - with concentrations: 5; 10; 20 mg/l .

 

q       Recomended Instrument Parameters (Varian instruments)

 

Lamp Current                  10 mA

Flame , Stoichiometry      N₂O-C₂H₂ , Reducing (red cone 1-1.5 cm)

Wavelenght                     422.7 nm

Slit                                  0.5 nm

 

To suppress ionization, add potassium or sodium salt to give final concentration 2 - 5 g/l.

Addition of strontium or lanthanum can minimize the effect of much interferences.