Assessment of Physical-Chemical Characteristics of Water and Sediments from a Brazilian Tropical Estuary: Status and Environmental Implications

Table 4

Exchangeable concentrations of Cd, Cu, Pb, and Zn (mg kg⁻¹) in sediments collected from the Jacuípe River’s estuary, 𝑛=5.

Date (sampling)	Point	Cd	Cu	Pb	Zn
03/2007 (1)	1	<0.05*	10,1±1.0	<5.0*	<1.3*
	2	<0.05	16.2±0.7	<5.0	4.8±0.2
	3	<0.05	13.9±0.8	<5.0	29.2±1.0
	4	<0.05	8.6±0.3	<5.0	43.7±0.2
	5	<0.05	8.7±0.7	<5.0	23.1±1.2
07/2007 (2)	1	1.1±0.04	2.4±0.03	<5.0	<1.3
	2	1.1±0.01	2.5±0.02	<5.0	4.7±0.2
	3	1.2±0.01	15.9±0.1	<5.0	26.4±0.1
	4	1.1±0.01	44.6±0.4	<5.0	43.4±0.1
	5	1.3±0.03	10.8±0.2	<5.0	17.8±1.4
08/2007 (3)	1	1.2±0.01	2.2±0.03	<5.0	4.0±0.1
	2	1.1±0.01	2.1±0.04	<5.0	2.0±0.04
	3	1.2±0.01	2.1±0.02	<5.0	2.5±0.05
	4	1.2±0.02	4.2±0.2	<5.0	6.0±0.2
	5	1.1±0.01	11.1±0.4	<5.0	<1.3
09/2007 (4)	1	<0.05	2.3±0.03	<5.0	3.1±0.1
	2	<0.05	2.4±0.1	<5.0	<1.3
	3	<0.05	5.4±0.04	<5.0	19.9±0.1
	4	<0.05	6.5±0.2	<5.0	17.2±0.2
	5	<0.05	5.8±0.1	<5.0	12.3±0.3
10/2007 (5)	1	<0.05	<1.3*	<5.0	<1.3
	2	<0.05	<1.3	33.4±4.0	<1.3
	3	<0.05	4.6±0.2	<5.0	21.0±0.2
	4	<0.05	6.1±0.2	22.8±0.8	19.3±1.0
	5	<0.05	3.4±0.3	12.2±1.5	<1.3

*Limit of detection as 3σ [24].