Lead Speciation and Bioavailability in Apatite-Amended Sediments

Table 3

Chopawamsic Creek sediment Pb speciation by linear combination fitting (LCF) for preamendment and postamendment experimental plot samples.

Sample	LCF-weighted contributions (%)					Error
	Galena	Hydrocerussite	Adsorbed Pb	Pyromorphite	Anglesite	𝜒^2a
Preamendment
Plot C	98		2			0.003
Plot D	94		6			0.001
Plot E	100					0.004
Plot C-Oxidized	44	56				0.003
Plot D-Oxidized	39	61				0.011
Plot E-Oxidized	44	46	10			0.002
Hillside source		36	64			0.005
Postamendment
Plot C	59		27	9	5	0.008
Plot D	63		34		3	0.006
Plot E	59		34	6	1	0.006
Plot C-Top layer	37		26	25	12	0.017
Plot D-Top layer	44	20	20		16	0.009
Plot E-Top layer	23		42	33	2	0.006

^(a)𝜒²=[(data−fit)²]/[data²].