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 /im have been removed. The detection limit depends on the device used; In general, cobalt contents can be determined from 1 fjg/\. For cobalt levels higher than 100/yg/l, use of the flame technique is recommended [1].
NEN 6468-1982 history
1982NEN 6468-1982 Water - Determination of cobalt content by atomic absorption spectrometry (graphite furnace technique)