There are several studies on the method of contaminating soil with heavy metals. Which is better for contaminating the soil with heavy metals by adding dissolved concentrations in a known particle, or adding the element salt in powder form with the known concentration
Definitely not easy. I would probably start with a defined artificial soil. Page 38 of this document has a preparation method: https://www.oecd.org/chemicalsafety/testing/44098118.pdf
Soils may become contaminated by the accumulation of heavy metals and metalloids through emissions from the rapidly expanding industrial areas, mine tailings, disposal of high metal wastes, leaded gasoline and paints, land application of fertilizers, animal manures, sewage sludge, pesticides, wastewater irrigation, coal combustion residues, spillage of petrochemicals, and atmospheric deposition.
About artificial soil this document has a preparation method:
https://www.tandfonline.com/doi/full/10.1080/23311916.2020.1721409#
https://doi.org/10.1080/23311916.2020.1721409
Enas Awni Mahdi Al- Nabhan First you have to calculate the HM concentration in your soil and can then spike the soil (sterilized or non-sterilized) with a known amount of HM using standard HM solution of different concentration (ppm or ppb). You can either purchase a stock solution of mixture or HM or a single HM.
https://www.sigmaaldrich.com/catalog/search?interface=All&term=heavy+metal+mix&N=0&mode=match+partialmax&focus=product&lang=en®ion=global
https://www.merckmillipore.com/IN/en/product/Cadmium-standard-solution,MDA_CHEM-119777
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