Ranges of B, Cd, Cr, Cu, Fe, Pb, Sr, Tl, and Zn Concentrations and Isotope Ratios in Environmental Matrices from an Urban Area

Table 1

Sequential extraction scheme.

Code	Extracted phase	Solution	Volume (mL)
F1	Exchangeable	Distilled water	40
F2	Carbonates	0.11 M·CH3COOH (acetic acid)	40
F3	Reducible	0.1 M·NH2OH·HCl (hydroxylamine hydrochloride)	40
F4	Oxidizable	8.8 M·H2O2 (hydrogen peroxide)	10 + 10
		1 M·CH3COONH4 (ammonium acetate) pH 2	50
F5	Residual I	Aqua regia	20
F6	Residual II	HF	10