Lead Speciation and Bioavailability in Apatite-Amended Sediments

Table 2

Chopawamsic Creek sediment Pb, pore water Pb, and ortho-P concentrations for preamendment and postamendment experimental plots.

Sample	Preamendment			Postamendment
	Sed Pb^(a) mg kg^−1	PW Pb^(b)μg L^−1	Ortho-P mg L^−1	Sed Pb mg kg^−1	PW Pb μg L^−1	Ortho-P mg L^−1
Plot A	122	0.042	0.030	114	0.098	0.002
Plot B	132	0.113	0.020	44	0.042	0.002
Plot C	2930	16.100	0.007	3680	0.903	0.002
Plot D	1763	11.300	0.020	1390	0.501	0.005
Plot E	2993	20.700	0.009	3390	0.513	0.002

^(a)Sediment Pb concentration determined on a dry weight basis by microwave-assisted acid digestion (EPA Method 3051). ^(b)Porewater Pb concentration determined by ICP-MS.