How to test for how much iron and calcium is in food

Hello,

How do we test for how much iron and calcium is in food? I want to know how to test for it, what equipment we need, any chemicals and how to show HOW MUCH of that mineral is in the food. 

Thanks















I didn't find the right solution from the internet.

References:


www.sciencebuddies.org/science-fair-projects/ask-an-expert/viewtopic.php?t=12179


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