The standard applies to all types of water. The detection limit depends on the device used; In general, silver contents can be determined from 0.01 mg/l. For levels lower than 0.1 mg/l, use of the graphite furnace technique is recommended [2].
NEN 6462-1982 history
1982NEN 6462-1982 Water - Determination of silver content by atomic absorption spectrometry (flame technique)