3 ms·
Can confirm from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284385/#!po=12.5000 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284385/#!po=12... That 30-50ng
by azeotropic 9y ago
Can confirm from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284385/#!po=12.5000 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284385/#!po=12...
That 30-50ng/g is the concentration in uncontaminated temperate soil.