This is what my professor said
"As for mustard plants...it's mentioned in a text box in the Harris book we used for Quant. I tried using peas instead of indian mustard..the book mentions indian mustard and that the lead needs to be made soluble w/ EDTA...then the plants can sequester it...the only issues is that once it's able to move more freely w/ the EDTA it has the chance to leech away to other areas as well. We planted peas in the lead contaminated area and watered w/ EDTA water and after they grew but before we removed the plants [waiting for them to die in the fall before pulling them] they closed the area for remediation before building so we never got to test them. There's got to be a reference in that text box in the book though...direct them to that reference is my advice."
That's the picture I just took out of my old quantitative chem book, too bad it doesn't list any reference.
I'm sure "remediation of lead" will give you tons of results, as I know I've seen a lot about mustard/pea plants. The only thing I don't know is the concentration of EDTA.
As for testing, Flame Atomic Absorption is no doubt your best bet. It's simple, easy, cheap, and fast if you have the machine (which costs a lot) but most universities have. For DIY ways, no idea, probably some terribly boring and complex titration.
Testing for metals is so cheap with AA...if I was still at school I'd do it for a large pizza. The machine is very cool, brilliant acetylene oxygen flame that turns colors depending on the metal ions present in your sample, but it just doesn't do it for me. I like HPLC/LCMS/GCMS stuff more because it's like solving a puzzle, whereas AA is just plug in your metal detector lamp, run it, and get a readout.
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