Research Article

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

Table 3

Concentrations (mg L−1) of nitrite (N- N O 2 ), nitrate (N- N O 3 ), and soluble phosphate (P- P O 4 3 ) in water samples collected from the Jacuípe River’s estuary, 𝑛 = 3 *.

Date (sampling)PointNitrite (N- N O 2 )Nitrate (N- N O 3 )Phosphate (P- P O 4 3 )**
SDSDSD

03/2007 (1)1<0.004***<0.0040.030.09<0.02*<0.02*
20.02<0.0040.070.07<0.02<0.02
30.010.020.070.06<0.02<0.02
40.020.030.070.04<0.02<0.02
50.020.020.060.05<0.02<0.02

05/2007 (2)10.010.010.120.120.090.12
20.010.010.050.120.080.11
30.010.020.110.130.110.09
40.010.010.130.150.030.03
50.020.010.100.140.080.03

06/2007 (3)10.010.020.110.090.110.14
20.010.020.090.090.090.14
30.030.020.090.100.160.16
40.020.010.100.090.140.14
50.020.010.100.100.130.14

07/2007 (4)10.010.010.070.090.060.07
20.010.010.060.090.090.09
30.010.010.060.090.090.09
40.010.010.150.120.050.05
50.010.010.130.150.040.05

08/2007 (5)1<0.004<0.0040.070.050.160.09
2<0.004<0.0040.060.050.060.08
3< 0.004<0.0040.060.050.100.12
40.010.010.090.050.100.13
50.010.010.080.070.150.10

09/2007 (6)1<0.004<0.0040.130.110.060.06
2<0.0040.010.210.120.080.07
30.010.010.140.140.080.08
40.010.010.110.100.050.21
50.010.010.120.100.040.04

10/2007 (7)1<0.004<0.0040.010.090.220.06
2<0.004<0.0040.060.090.040.08
3<0.0040.010.070.080.060.09
40.010.010.050.090.060.06
50.010.010.070.100.060.06

11/2007 (8)10.0110.0150.110.100.120.12
20.0150.0110.100.110.120.14
30.0120.0130.110.120.130.13
40.0150.0150.110.100.100.15
50.0160.0150.110.110.120.13

03/2008 (9)1<0.004***<0.0040.070.090.020.03
20.0050.010.080.090.030.03
30.0050.010.080.100.050.04
40.010.010.100.120.030.03
50.010.010.090.080.030.03

04/2008 (10)1<0.004<0.0040.070.080.030.02
2<0.004<0.0040.070.140.04<0.02*
30.010.010.300.320.090.05
40.010.010.200.330.040.03
50.010.010.200.240.040.03

06/2008 (11)1<0.04<0.0040.120.010.030.03
2<0.004<0.0040.090.09<0.020.04
30.0080.0100.090.100.070.05
40.0050.010.010.090.030.03
50.0100.020.090.090.030.03

08/2008 (12)1<0.004<0.0040.070.100.030.04
2<0.004<0.0040.090.14<0.020.05
30.010.0130.070.090.070.06
40.0080.010.100.100.040.03
50.0100.010.080.080.020.08

09/2008 (13)1<0.004<0.0040.080.090.030.03
2<0.004<0.0040.010.100.03<0.02
30.010.010.130.100.03<0.02
40.010.010.110.090.030.03
50.010.010.100.100.030.04

S: surface and D: deep. *In order to simply the data exposition, the relative standard deviations were omitted, but all of these values were smaller than 10%. **Soluble phosphate. ***Limit of detection as 3σ [24].