Do I need to store metal ion solution (lead nitrate) in refrigerator?

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Mário Silva

Yes, and I would also recommend you to acidify it with HNO3.

Cheers

Ramu Kokkiligadda

Mário Silva but the solutions are to be maintained at different pH, both acidic and basic.

Of course, I mean the samples in which Pb will be analyzed. It's your best option to ensure you don't loose the analyte due to the formation of colloids, precipitation, complexation, etc.

Mário Silva Thank you for your valuable suggestions