If you are analyzing water ...

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If you are analyzing water for trace metals, please make sure the sample bottles are plastic based (Teflon or polypropylene) and add as much pure concentrated nitric acid (metal free) so as to reduce the sample to pH < 2. Please refer to Standard Methods for the Examination of Water and Wastewater for more details on sample bottle preparation, the procedure during collection, and preservation until analysis.  Agreed, the objective of sampling and constituents in water to be analyzed would further narrow down specific steps. Agee with suggestions already provided by colleagues in the group.