This part of ISO 5667 specifies procedures for the determination of time-weighted average concentrations and equilibrium concentrations of the free dissolved fraction of organic and organometallic compounds and inorganic substances, including metals, in surface water by passive sampling, followed by analysis.
DS/EN ISO 5667-23:2011 history
2011DS/EN ISO 5667-23:2011 Water quality - Sampling - Part 23: Guidance on passive sampling in surface waters