Preparing the Instrument Calibration Solution

The instrument calibration solution is used when performing an instrument calibration.

It contains the following:

5 ppm:  Al, As, Ba, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Sr, Zn

50 ppm: K

Matrix: 1% HNO₃

Procedure for making up 1 L of the wavelength calibration solution using 1000 ppm single element standard solutions:

Use the following equation to calculate the volume of known standard required to obtain the desired concentration (C₂):

C₁V₁ = C₂V₂

where,

C₁ = concentration of known standard

V₁ = the volume of the known standard required to obtain the desired concentration

C₂ = desired concentration

V₂ = final volume

To make up 1 L of a 5 ppm solution:

Step 1

Calculate the volume of each 5 ppm single element standard required to make up a 1 L standard.

V₁ = C₂V₂/C₁

     = 5 ppm × 1000 mL/1000 ppm

     = 5 mL aliquot of each 1000 ppm single element standard is required

Step 2

Calculate the volume of 50 ppm K standard required to make up a 1 L standard.

V₁ = C₂V₂/C₁

     = 50 ppm × 1000 mL/1000 ppm

     = 50 mL aliquot of 1000 ppm K standard is required

Step 3

Make up standard to 1 L with 1% HNO₃ (10 mL conc. HNO₃ in 1 L H₂O).

Tip Store the remaining calibration solution in a pre-cleaned polyethylene bottle for future use.

 

See also:

• Performing an instrument calibration