Trace Metal Content of Sediments Close to Mine Sites in the Andean Region

Table 3

Concentrations (mg/kg) of all the sediment samples in each fraction of the BCR sequential extraction.

Sample	BCR Step	Al	As	Cd	Cu	Cr	Fe	Hg	Ni	Pb	Zn
Y1	Step  1	61.9	<0.05	<0.1	<0.1	<0.1	9.2	<0.02	0.4	<0.1	4.3
	Step  2	473	0.28	0.5	0.7	<0.1	2212.5	<0.02	0.9	0.4	8.7
	Step  3	647.2	<0.05	<0.1	<0.1	1.4	120.6	<0.02	1.3	<0.1	4.6
	Step  4	12505.2	5	1.9	9.6	4	10055.1	<0.02	3.3	7.7	27.4
Y2	Step  1	119.7	0.4	0.2	13.6	<0.1	50.6	<0.02	1.8	0.5	18.6
	Step  2	1154.7	0.6	0.7	13.4	<0.1	2564.7	<0.02	1.8	3.2	18.8
	Step  3	716.2	<0.05	<0.1	27.0	1.3	167.5	0.02	1.6	0.1	6.6
	Step  4	17387.9	1.5	3.1	79.1	5.5	11147.2	1.02	4.2	16.2	46.6
Y3	Step  1	153.1	3.29	0.3	4.6	<0.1	24.3	<0.02	1.6	<0.1	20
	Step  2	675.9	2.29	0.7	4	<0.1	3136.9	<0.02	1.6	0.9	18.1
	Step  3	381.2	0.3	<0.1	21.3	0.4	407.5	<0.02	2.4	<0.1	7.7
	Step  4	11438.8	48	2.1	33.5	3.9	10909.3	<0.02	2.8	8	30.2
Y4	Step  1	910.6	0.35	0.3	159.8	<0.1	26	<0.02	3.1	<0.1	49.6
	Step  2	2356.1	0.3	1	70.9	<0.1	6014	<0.02	2.2	1.6	26.8
	Step  3	623.6	<0.05	<0.1	161.4	1.5	108.5	<0.02	1.6	<0.1	5.9
	Step  4	20632.4	22	2.4	109.9	4.2	11661.9	<0.02	3.6	7.9	43.8
Y5	Step  1	815.3	0.3	1.5	101.2	0.2	194.5	<0.02	2.55	0.2	36.8
	Step  2	1482.3	0.35	2.1	63.7	0.1	8542.5	<0.02	2.1	1.8	21.6
	Step  3	176	0.08	0.1	26.6	0.4	75.9	0.25	2.35	<0.1	2.9
	Step  4	12792	350	7.7	254.7	5.0	16071.5	1.01	4.6	33.1	53.5
R1	Step  1	509.2	0.28	6.6	20.9	<0.1	14.3	<0.02	4.9	1.1	0.6
	Step  2	1582.5	0.55	3.4	10.9	<0.1	4345.1	<0.02	2.8	4.7	118.7
	Step  3	935.8	<0.05	0.3	106.1	1.0	191	0.07	2.3	<0.1	0.5
	Step  4	12577.5	55.1	2.0	60.1	2.3	10809.7	0.03	2	86.8	75.2
R2	Step  1	321.5	0.24	0.8	1.1	<0.1	13.2	<0.02	2.5	0.9	0.5
	Step  2	1470.9	1.36	0.9	1.5	0.2	3362.4	<0.02	1.7	7.9	23.9
	Step  3	307.2	<0.05	<0.1	9.5	1.3	46.9	0.14	1.9	<0.1	0.2
	Step  4	11475	61.7	2.8	22.3	6.1	13387.8	0.03	5.7	45.9	79
R3	Step  1	244.8	0.28	1.7	3.3	<0.1	10.1	<0.02	1.9	0.8	61.5
	Step  2	1257.4	1	1.3	3.2	<0.1	3567.8	<0.02	1.3	7.1	38.3
	Step  3	253.3	<0.05	0.2	10.7	0.8	51.4	0.10	1	<0.1	6.8
	Step  4	7846.4	47.5	2.2	25.6	4.0	11631.7	<0.02	2.8	32.6	43.3
R4	Step  1	413.9	0.36	0.2	<0.1	<0.1	48.3	<0.02	1.2	1.2	0.7
	Step  2	1833.6	0.96	0.5	0.4	0.1	2293.2	<0.02	0.9	5.6	38.3
	Step  3	465.6	<0.05	<0.1	2.1	2.2	70.4	0.06	0.9	0.6	0.4
	Step  4	11617.3	55.5	2.4	14.1	4.4	12319.8	0.03	3.4	40.5	86.4