title: Radial and axial gradients of lead concentration in bark and xylem of hardwoods.
mesh_terms: D007854:Lead / Q000032:analysis*; D010710:Phosphates / Q000032:analysis; D010944:Plants / Q000032:analysis*; D011188:Potassium / Q000032:analysis; D013045:Species Specificity; D013997:Time Factors; D014197:Trees; D001335:Vehicle Emissions
chemical_list: D010710:Phosphates; D001335:Vehicle Emissions; D007854:Lead; D011188:Potassium