The standard applies to aqueous solutions with a specific conductivity less than 300 mS/m (determined in accordance with NEN 6412) from which particles larger than 0.45 //m have been removed. The detection limit depends on the device used; In general, barium contents can be determined from 5/t/g/l. For barium levels higher than 1 mg/l, use of the flame technique is recommended.
NEN 6436-1982 history
1982NEN 6436-1982 Water - Determination of barium content by atomic absorption spectrometry (graphite furnace technique)