Sources of Nitrate in Ground Water Aquifers of the Semiarid Region of Tanzania
Table 3
Identified nitrate sources in boreholes using the nitrate-chloride ratio during the wet and dry seasons.
Wet
Dry
ID
Depth
[NO3−]
[Cl−]
[NO3−]
[Cl−]
[NO3−/Cl−]
Rem.
[NO3−]
[Cl−]
[NO3−]
[Cl−]
[NO3−/Cl−]
Rem.
BH 1
100
81.90
311.30
1.32
8.77
0.15
MN/SE
204.60
233.20
3.30
6.57
0.50
MN/SE
BH 2
100
630.00
326.40
10.16
9.19
1.11
FT
522.70
277.80
8.43
7.83
1.08
FT
BH 6
70
59.60
375.50
0.96
10.58
0.09
MN/SE
25.10
271.90
0.40
7.66
0.05
MN/SE
BH 7
100
15.00
330.30
0.24
9.30
0.03
MN/SE
22.40
279.60
0.36
7.88
0.05
MN/SE
BH 9
75
104.00
73.80
1.68
2.08
0.81
MN/SE
41.40
215.60
0.67
6.07
0.11
MN/SE
BH 10
70
345.50
231.20
5.57
6.51
0.86
MN/SE
45.00
73.80
0.73
2.08
0.35
MN/SE
BH 15
100
15.00
345.80
0.24
9.74
0.02
MN/SE
268.40
180.60
4.33
5.09
0.85
MN/SE
BH 16
100
79.25
365.20
1.28
10.29
0.12
MN/SE
4.40
139.80
0.07
3.94
0.02
MN/SE
BH 17
100
127.00
289.40
2.05
8.15
0.25
MN/SE
36.10
211.70
0.58
5.96
0.10
MN/SE
BH 28
60
5.00
29.10
0.08
0.82
0.10
MN/SE
91.70
111.90
1.48
3.15
0.47
MN/SE
BH 30
60
482.00
250.60
7.77
7.06
1.10
FT
195.30
77.90
3.15
2.19
1.44
FT
BH 31
41
14.20
38.80
0.23
1.09
0.21
MN/SE
265.50
268.90
4.28
7.57
0.57
MN/SE
BH 35
40
34.20
137.90
0.55
3.88
0.14
MN/SE
213.50
139.90
3.44
3.94
0.87
MN/SE
BH 36
50
67.60
153.40
1.09
4.32
0.25
MN/SE
116.50
224.90
1.88
6.34
0.30
MN/SE
BH 42
40
93.00
106.80
1.50
3.01
0.50
MN/SE
117.60
169.9
1.90
4.79
0.40
MN/SE
BH 43
150
6.15
6.20
0.10
0.17
0.57
MN/SE
87.50
130.1
1.41
3.67
0.39
MN/SE
BH 45
75
128.00
351.60
2.06
9.90
0.21
MN/SE
24.20
675.7
0.39
19.03
0.02
MN/SE
BH 53
105
31.00
75.70
0.50
2.13
0.23
MN/SE
86.50
230.9
1.40
6.50
0.21
MN/SE
BH 54
103
34.00
81.60
0.55
2.30
0.24
MN/SE
41.50
98.9
0.67
2.79
0.24
MN/SE
BH 55
111
63.60
104.90
1.03
2.95
0.35
MN/SE
46.70
131.9
0.75
3.72
0.20
MN/SE
BH 56
103
86.40
114.60
1.39
3.23
0.43
MN/SE
72.80
123.9
1.17
3.49
0.34
MN/SE
BH 57
100
54.20
110.00
0.87
3.10
0.28
MN/SE
101.30
119.9
1.63
3.38
0.48
MN/SE
BH 58
106
104.16
49.35
1.68
1.39
1.21
FT
190.34
79.875
3.07
2.25
1.36
FT
BH represents the identification number for the borehole sample; MN/SE: manure/sewage effluents; FT: fertilizers; Rem.: remarks; ×10−3 Mol/L; ×10−3 g/.
