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 6

Fe and Zn concentrations at each step of the SM&T sequential extraction procedure.

Samples	Fractions
	F1			F2			F3
	Zn (mg kg^−1)		Fe; (mg kg^−1)	Zn (mg kg^−1)		Fe; (mg kg^−1)	Zn (mg kg^−1)		Fe; (mg kg^−1)
	D2 method	HSSR method		D2 method	HSSR method		D2 method	HSSR method
A1	46.7	50.7	3.4	60.2	54.6	1,223	27.0	20.1	494.5
A2	132.6	120.5	18.9	143.8	138.3	1,361	114.5	111.7	1,357
A3	181.3	211.1	23.4	135.6	128.6	1,187	123.5	102.8	1,225
A4	117.0	124.0	18.5	138.0	130.3	1,398	136.9	119.3	1,115
A5	619.6	565.5	67.3	288.5	265.1	1,337	1,453	1,450	4,762
A6	108.7	111.8	0.6	205.6	177.7	1,220	77.7	65.4	638.8
A7	87.5	78.5	1.5	85.0	70.1	873.6	53.3	49.5	498.2
A8	35.2	33.9	0.2	288.1	277.2	1,800	95.7	85.0	1,046
A9	72.5	71.1	0.8	155.6	146.6	2,142	59.8	47.9	930.9
A10	147.0	152.5	18.9	397.7	409.8	2,626	347.8	334.1	3,498