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

Table 3

Comparison of the results of the ammonium-EDTA and acetic acid extractions of CRM 483 with certified and indicative values [31]. The number of replicates is given between brackets. Concentrations in mg/kg.

CRM483	Certified values [31]
	Ammonium-EDTA	Acetic acid
Cd	20.4±1.3	18.3±0.6
Cr	28.6±2.6	18.7±1.0
Cu	215±11	33.5±1.6
Ni	28.7±1.7	25.8±1.0
Pb	229±8	3.1±0.25
Zn	612±19	620±24
CRM483	This work
	Ammonium-EDTA (6)	Acetic acid (6)
Cd	20.6±0.6	15.2±1.48
Cr	26.4±3.4	13.3±1.95
Cu	207±4	28.1±0.46
Ni	26.5±1.78	21.5±0.77
Pb	202±27	1.7±0.21
Zn	607±4	556±23