Table 4.

Affinity (K_d) of SH-SAMMS for As, Cd, Hg, and Pb in Various Fluids^b

matrixa	conductivity (mS/cm)	pH	available protein content	Kd (mL/g) in various matrices
				As	Cd	Hg	Pb
dilute urine (rat)	1.8	7.2	+		7.9 × 104	2.8 × 104	5.6 × 103
whole human urine	7.9	6.9	++	3.5 × 103	1.1 × 104	5.6 × 103	1.9 × 103
whole human urine (large pore)	7.9	6.9	++	5.0 × 103	1.0 × 104	2.3 × 104	1.1 × 103
whole human blood	4.0	7.5	+++	4.2 × 103	2.0 × 103	1.2 × 103	1.3 × 103
whole human blood (large pore)	4.0	7.5	+++	4.2 × 103	3.3 × 103	7.6 × 103	1.9 × 103
SGFc (large pore)	32.9	1.1	−	1.7 × 104	1.7 × 102	1.5 × 106	0
SIFd (large pore)	5.9	6.8	−	2.7 × 104	7.7 × 105	2.7 × 105	2.0 × 104

^aSilica pore sizes noted in Table 1.

^bMeasured at an initial metal concentration of 50 μg/L (each), S/L of 0.2 g/L except for urine, blood, and plasma, S/L of 1 g/L.

^cSGF = synthetic gastric fluid.

^dSIF = synthetic intestinal fluid.