A Critical Evaluation of Single Extractions from the SMT Program to Determine Trace Element Mobility in Sediments

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 acid	r ^2
log [Cu]HOAc = 1.073 log [Cu]total + 0.363 pH − 3.645	0.851*
log [Cr]HOAc = 0.958 log [Cr]total − 0.408 log [Fe]total − 1.683	0.345
log [Zn]HOAc = 1.013 log [Zn]total + 0.479 log [Ca]total − 0.399 log [Al]total − 0.312	0.856*
log [Ni]HOAc = 0.915 log [Ni]total + 0.557 log [Ca]total − 0.439 log [Al]total − 0.478	0.766*
log [As]HOAc = 1.356 log [Ca]total + 0.649 log [As]total − 0.617 log [Fe]total + 0.641 log [Al]total − 1.101	0.751*
log [Cd]HOAc = 0.663 log [Cd]total + 0.268 log [Ca]total − 0.077	0.835*
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] − 1.289	0.968*
log [Co]HOAc = 0.591 log [Co]total + 0.457 log [Ca] − 0.591	0.590*
Ammonium-EDTA
log [Cu]EDTA = 1.058 log [Cu]total − 0.546	0.698*
log [Cr]EDTA = 0.512 log [Cr]total + 0.159 pH − 0.063	0.393
log [Zn]EDTA = 1.043 log [Zn]total + 0.368 log [OC] + 0.268 log [Ca]total − 0.765	0.883*
log [Ni]EDTA = 0.858 log [Ni]total ± 0.172 pH + 0.326 log [OC] + 0.473	0.715*
log [As]EDTA = 0.878 log [As]total + 0.513 log [Al]total − 0.748 log [Fe]total + 0.373 log [Ca]total − 1.616	0.670*
log [Cd]EDTA = 0.663 log [Cd]total + 0.345 log [OC] + 0.220 log [Fe]total − 0.62	0.883*
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 − 1.289	0.749*
log [Co]EDTA = −0.384 log [OC] + 0. 333 log [Co]total + 3.75	0.192