500 795/Rev D/07-14
Page 28
Section 3
Analysis Preparation
3.1
Calibration standards
A comprehensive range of aqueous calibration standards is available from Jenway. These must be diluted to
a suitable concentration for aspiration into the flame (see Sections 3.3 and 4.3)
Industrial Standards (500ml)
Part Code
1000ppm K
025 023
1000ppm Li
025 024
3000ppm Ba
025 025
1000ppm Na
025 021
1000ppm Ca
025 009
When preparing standards always observe the following:
1.
Standards must always contain the constituents that are present in the samples in the same
concentration ratios; i.e. if samples are prepared in 0.05M HCl then the standards should also
contain 0.05M HCl.
2.
Always ensure that the standards encompass the expected range of the sample concentrations.
3.
Standards should be prepared so as to ensure that the region in which measurements are made
coincide with the concentrations that produce the optimum performance from the flame
...when measuring calcium, the top standard is ideally 100ppm,
NOTE: The blank used should contain all the constituents of the standard solutions except the element being
measured.
Since a flame photometer measures the concentration of the element itself in solution, standard solutions
prepared from the salts of sodium, potassium, lithium, calcium and barium must be made up to contain the
concentrations required in terms of the quantity of the elements.
Below are two examples of how to prepare standards of 1mg Na/100ml (10ppm Na) and 1mg K/100ml
(10ppm K).
DOMINIQUE DUTSCHER SAS
