For best results dilute the stock single-element barium standard solution 1.000 gram per litter (CPA No C006100) 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                  20 mA

Spectral Bandwidth         0.5 nm

Wavelenght                     553.6 nm

Maximum Ash Temp.      1400 ^oC (Nitric acid medium)

 

Typical response (Argon): 20 μl of 50 ppb Ba solution gives about 0.25 Abs.

For complex samples and/or matrixes Thorium-Magnesium modifier (CPA No MD007) is recommended. Use this solution for addition to blanks, calibration standards and samples.