Tessier五步连续提取法.pdfVIP

844 ANALYTICAL CHEMISTRY, VOL. 51, NO. 7, JUNE 1979 Sequential Extraction Procedure for the Speciation of Particulate Trace Metals A. Tessier,” P. G. C. Campbell, and M. Bisson Universit6 du QuBbec, INRS-Eau, C.P. 7500, Sainte-Foy, Qudbec G1V 4C7,Canada An analyticai procedure involving Sequential chemical ex- performed with bottom sediments, which are more easily tractions has been developed for the partitioningof Particulate obtained in workable quantities than is suspended matter. trace metals (Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn) into five Although iron and manganese are not generally referred to fractions: exchangeable, bound to carbonates, bound to as trace metals in the literature, they have been so designated Fe-Mn oxides, bound to organic matter, and residual. Ex- in the following sections in order to simplify the presentation perimental results obtained on replicate samples of fluvial of the results. bottom sediments demonstrate that the relative standard SELECTION OF FRACTIONS deviation of the Sequential extraction procedure is generally In defining the desired partitioning of trace metals, care better than A10 %. The accuracy, evaluated by comparing was taken to choose fractions likely to be affected by various total trace metal concentrations with the sum of the five environmental conditions; the following five fractions were individual fractions, proved to be satisfactory. Complementary selected. measurements were performed on the individual leachates, Fraction 1. Exchangeable. Numero