If drinking water samples for trace metal are not able to be filtered and acidified in the field but are kept below 4 °C and delivered to the lab in under 24 hours, can they still be considered safe or representative ?
Yes no problem.
https://www.who.int/water_sanitation_health/dwq/2edvol3d.pdf
Nothing will happen unless for some reason things like oxidation and other processes take place that results in the trace elements being lost as a result.
That's safe handling of the sample before analysis. That reduced temperature conditions and short period of 24hrs is enough
Theoretically, nothing should change. However, the redox conditions are important. In the case of waters with negative redox potential, their oxidation may occur, which will change the degree of oxidation of some compounds, e.g. nitrogen and sulfur and other elements, including trace metal.
Thank you Dorota Porowska!
As I will be taking water samples for trace element analysis for the first time. I want to make sure I consider all contamination possibilities and ensure sample quality is maintained.
Your answer is much appreciated.
But you should prevent samples from metals precepitation by using nitric acid in field
it is recommended to analyse within a weak, Need to store in dark and cool place.Sample should be sealed and in glass bottle.
Thank you @HamzaElFadili, @VirendraKumarSaxena and @SuparnaBhattacharyya for your answers. I really appreciate it!
Shekinah Pilamp what Method are you using? They should be fine, but check against your method.
J. Hunter Adams thank you for asking. I am concerned about the integrity of the water samples as the location of the water samples is in a rugged terrain and transporting the samples immediately to the laboratory might not be possible.
I have decided I will filter and acidify the water samples for trace metals out in the field.
For your question regarding what method I am using, if your referring to the sampling method, I have adapted the water sampling method from FOREGS Geochemical Mapping Field Manual (1998).
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