Effects of Iron Concentration Level in Extracting Solutions from Contaminated Soils on the Determination of Zinc by Flame Atomic Absorption Spectrometry with Two Background Correctors

Table 5

Certified and obtained Fe and Zn concentrations in BCR-701 (𝑛=3) and BCR-483 (𝑛=3) using the BCR three-step sequential extraction procedure.

Fraction	Metal	BCR-701			BCR-483
		Certified value	Obtained value		Indicative value^a	Obtained value
			D2 method	HSSR method		D2 method	HSSR method
		mean ± U	mean ± SD	mean ± SD	mean ± U	mean ± SD	mean ± SD
		(mg kg^−1)	(mg kg^−1)	(mg kg^−1)	(mg kg^−1)	(mg kg^−1)	(mg kg^−1)
F1	Zn	205 ± 6	238 ± 12	205 ± 13	441 ± 39	458 ± 11	442 ± 12
	Fe	71 ± 1^b	83 ± 1		36 ± 2^b	36 ± 2
F2	Zn	114 ± 5	162 ± 13	123 ± 3	438 ± 56	463 ± 18	439 ± 20
	Fe	7,698 ± 106^b	7,732 ± 109		6,691 ± 198^b	6,520 ± 219
F3	Zn	45.7±4.0	37.8±1.2	46.6±1.2	37.1±9.9	35.7±1.2	39.2±1.5
	Fe	1,097 ± 53^b	1,195 ± 45		1,153 ± 29^b	1,164 ± 149

U: uncertainty (half-width of the 95% confidence interval); SD: standard deviation.
^aFrom Rauret et al. [39].
^bIndicative values from Kubová et al. [38].