I am using 1g/L stock solution of Copper and Zinc prepared from Copper Sulphate pentahydrate and Zinc Chloride, respectively. I am using the stock solution to prepare standard solutions of concentrations between 0.1 mg/L to 10 mg/L by dilution. I am preparing the standard solutions everyday by dilution from the stock solution to calibrate the Atomic Absorption Spectrophotometer.
My question is that is it OK if I store the standard solutions, which are of quite low concentration and use them for future use instead of preparing everyday from the stock solution? If yes, what is the maximum storage period for which I can use them?
Store the stocks in the fridge, i.e. cool and dark, and they should last for months. What tends to happen is that they slowly concentrate due to evaporation. So use good containers. The more dilute solutions are more stable in acid. Even 1 mg/L is quite concentrated beside the solutions used to calibrate ICP-MS so it should be OK for a few days. Beyond that rely on testing for yourself.
I agree with Paul, So Store the stocks in the fridge, i.e. cool and dark, and they should last for months.
The solution should be refrigerated and sealed. The higher the concentration, the lower the temperature and the longer the storage time.
Store the stocks in the fridge, i.e. cool and dark, and they should last for months.
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