Is zinc standard solution formulated with zinc oxide and zinc sulfate heptahydrate required to be ca

Zinc standard solutions formulated with reference oxidizing (dryed) do not require calibration;

The zinc solution prepared with zinc sulfate heptahydrate must be calibrated because zinc sulfate heptahydrate may absorb or absorb part of the water, and its composition is not certain, resulting in an inaccurate zinc content, so calibration is required.

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