Method F-019G The Simple Flame Photometric Determination of Barium
This method is suitable for aqueous samples only which contain no interferent ions, eg. S042-, K+, etc.
Method:
From the Sherwood 1000ppm Barium standard prepare standards of 1000, 750, 500 and 250 using deionised water as diluent.
For lower concentration samples a set of Ba standards of 300, 200, 100 and 50 should be prepared. Do not set a lower top standard than 300 due to insensitivity of the technique to low Ba concentrations.
Aspirate the standards into the flame photometer and record the stable readings.
Plot a graph of intensity vs concentration on linear graph paper.
Aspirate the aqueous sample.
From the calibration graph obtain the sample concentration.
If there are interferent ions present Barium should be precipitated as Barium
Sulphate, dissolved in ammonia EDTA and then analysed.
