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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Environ Int. 2019 Jul 5;131:104967. doi: 10.1016/j.envint.2019.104967

Table 2.

Change in Pb speciation (weighted %) in the < 250 μm soil particle fraction as a result of phosphoric acid treatment at a molar ratio of Pb:P = 1:5.

Pb speciation (weighted %) R- factor
Pb bound to clay or mineral oxides Organic bound Pb Anglesite Plumbojarosite Pb phosphate (pyromorphite + Pb3(PO4)2
BHK5 Pre-treatment 58 13 0 24 5 0.0066
Post-treatment 17 58 0 0 25 0.0237
BHK6 Pre-
treatment 		49 16 0 23 12 0.0600
Post-
treatment 		31 69 0 0 0 0.1388
BHK10 Pre-
treatment 		57 11 0 26 6 0.0111
Post-
treatment 		42 0 22 0 36 0.0415
BHK11 Pre-
treatment 		45 21 0 23 12 0.0222
Post-
treatment 		0 0 21 0 45 0.0230