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Equilibrium partitioning of heavy metals in dutch field soils. I. Relationship between metal partition coefficients and soil characteristics
Author(s) -
Janssen René P. T.,
Peijnenburg Willie J. G. M.,
Posthuma Leo,
Van Den Hoop Marc A. G. T.
Publication year - 1997
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620161206
Subject(s) - soil water , partition coefficient , metal , environmental chemistry , chemistry , dissolved organic carbon , total organic carbon , soil test , partition (number theory) , soil science , environmental science , mathematics , chromatography , organic chemistry , combinatorics
Twenty Dutch soils were sampled at sites that were expected to have elevated levels of heavy metals compared to background values. Field‐based partition coefficients ( K p ) for As, Cd, Cr, Cu, Ni, Pb, and Zn were determined by calculating the ratio of the amount of metal extracted by concentrated HNO 3 to the metal concentration in the pore water. K p values varied widely with metal and soil type and correlated well with soil pH. To a lesser extent amorphous Fe‐content and dissolved organic carbon (DOC) also explained part of the variation in K p values. Thereupon, regression equations based on easily obtainable soil characteristics were derived. External validation of the regression equations showed that predicted log K p values were in agreement with measured values.