For best results dilute the stock single-element cadmium standard solution 1.000 gram per litter (CPA No C010100) to levels appropriate to the operating range of the instrument using. The working solution must be freshly prepared.

A calibration blank is used to establish the analytical calibration curve; the laboratory blank is used to assess possible contamination from the sample preparation procedure and to assess spectral background.

Calibration blank—Consists of 1% (v/v) nitric acid in high-purity analytical water.

 

q       Recomended Parameters (Varian instruments)

 

Lamp Current                  4 mA

Spectral Bandwidth         0.5 nm

Wavelenght                     228.8 nm

Maximum Ash Temp.      300 ^oC (Nitric acid medium)

 

For analyse of cadmium by Graphite Furnace using of Ammonium Phosphate modifier (CPA No MNH03) is recomended. Maximum Ash Temperature 600^oC with chemical modifier.

Typical response (Argon): 10 μl of 2 ppb As solution + 5 μl modifier gives about 0.2 Abs.