PMC4652336_01
a. Cr enrichment factor versus Al concentration (EFc-Al)r = + 0.30. b. Fe enrichment factor versus Al concentration (EFc-Al)r = + 0.59. c. Cu enrichment factor versus Al concentration (EFc-Al)r = + 0.05. d. Zn enrichment factor versus Al concentration (EFc-Al) r = + 0.34. e. Cd enrichment factor versus Al concentration (EFc-Al)r = + 0.17. f. Pb enrichment factor versus Al concentration (EFc-Al)r = + 0.30
40201_2015_224_Fig5_HTML.jpg
PMC4652336_01_40201_2015_224_Fig5_HTML.jpg
Fig5
Fig. 5d. From figures it is seen that most of the elements are independent of Al concentrations when Al concentration > 67.50 ng/m3.