Table 8: Ammonium-EDTA and acetic acid extractable element concentrations as a function of their total concentrations and total concentrations of Al, Fe, Ca, and organic carbon (OC). (n = 72, significant at α = 0.05). Acetic acid is abbreviated as “HOAc” in the equations.

Acetic acidr 2

log [Cu]HOAc = 1.073 log [Cu]total + 0.363 pH − 3.6450.851*
log [Cr]HOAc = 0.958 log [Cr]total − 0.408 log [Fe]total − 1.6830.345
log [Zn]HOAc = 1.013 log [Zn]total + 0.479 log [Ca]total − 0.399 log [Al]total − 0.3120.856*
log [Ni]HOAc = 0.915 log [Ni]total + 0.557 log [Ca]total − 0.439 log [Al]total − 0.4780.766*
log [As]HOAc = 1.356 log [Ca]total + 0.649 log [As]total − 0.617 log [Fe]total + 0.641 log [Al]total − 1.1010.751*
log [Cd]HOAc = 0.663 log [Cd]total + 0.268 log [Ca]total − 0.0770.835*
log [Pb]HOAc = −2.93 pH + 0.75 log [Pb]total − 0.905 log [Fe]total + 1.071 log [Al]total − 0.598 log [OC] − 1.2890.968*
log [Co]HOAc = 0.591 log [Co]total + 0.457 log [Ca] − 0.5910.590*

Ammonium-EDTA

log [Cu]EDTA = 1.058 log [Cu]total − 0.5460.698*
log [Cr]EDTA = 0.512 log [Cr]total + 0.159 pH − 0.0630.393
log [Zn]EDTA = 1.043 log [Zn]total + 0.368 log [OC] + 0.268 log [Ca]total − 0.7650.883*
log [Ni]EDTA = 0.858 log [Ni]total ± 0.172 pH + 0.326 log [OC] + 0.4730.715*
log [As]EDTA = 0.878 log [As]total + 0.513 log [Al]total − 0.748 log [Fe]total + 0.373 log [Ca]total − 1.6160.670*
log [Cd]EDTA = 0.663 log [Cd]total + 0.345 log [OC] + 0.220 log [Fe]total − 0.620.883*
log [Pb]EDTA = 1.017 log [Pb]total − 0.338 log [Al]total + 0.166 log [Fe]total + 0.183 log [OC] + 0.085 pH − 1.2890.749*
log [Co]EDTA = −0.384 log [OC] + 0. 333 log [Co]total + 3.750.192