Heavy Metals In Hydroponic Nutrients

I was wondering what happens to the heavy metals found in some brands of nutrients when growing cannabis. Are they taken up by the plant? If so, are they removed during this final flush week I hear growers do?
 
Here is a site I stumbled across that lists the brands and what (if any) heavy metals their product contains. https://apps4.cdfa.ca.gov/fertilizerproducts/
 
Also, some info on heavy metals: https://www.aadnc-aandc.gc.ca/eng/1100100023403/1100100023423
 
Thanks.