If nothing precipitates or evaporates over time, indefinitely. Heavy metals won't go anywhere. However, if you see any solids forming, you should re-suspend them; likewise, you must ensure you didn't lose anything due to evaporation, because of course you'll get wrong values for your concentrations. The best part about ICP is no matter what is in your sample, everything "burns" to the final end product which is detected. Chemical changes in the sample are not important. (And once you analyze your samples, dispose of them as quickly as possible: they tend to accumulate.)
https://www.ime.fraunhofer.de/content/dam/ime/en/documents/AE/SOP_ICP-OES_en.pdf
please see section 6.1 and 7.3. I agree withPavlov
If the stock solution was a acid solution, indefinitely. Casuse not, observe the precipitation formation, because, some metals precipitation in hidroxide form.
Thank you all... I have another question, Can I store those samples in refrigerator and use it later?
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