Fig. 3: Characteristics of some REEs parameters in fine particulate matter (PM) from 13 industrial activities.
From: Atmospheric emissions of fine particle matter bound rare earth elements from industry
a The REEs-δEu diagram; b the La-Ce-Sm ternary diagram, which regards the sum of the three variables as a unit 1 and uses the percentage to represent the structural ratio of a single variable to the whole, and reflects the characteristics of the object according to the position information of the research object in the triangle diagram; c, d some REEs ratios characteristics in industrial particulate matter (PM) from 13 industries.
