Chemistry Reference
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Sample no
a
Nitrate-nitrogen content,
mg L
−1
as
N
Plasma emission
b
Colorimetry
1
0.010±0.002
0.013±0.001
2
0.019±0.002
0.021±0.001
a
Samples 1 and 2 refer to the surface water samples taken from the Sanshiroike pond at the
University of Tokyo
b
Measured at 391.4nm
Source: Reproduced with permission from the American Chemical Society [451]
Table 2.33
Anions interference in nitrate-nitrogen determination by specific ion electrode
Nitrate as nitrogen added
mg L
−1
Anion
Added
mg L
−1
0
1
5
10
25
50
Nitrate as nitrogen detected
mg L
−1
Nitrite
5
1.20
1.30
5.00
10.50
26.10
53.20
10
1.50
1.70
5.60
10.50
28.20
58.10
50
4.40
4.50
8.40
13.50
28.70
60.40
Bicarbonate
50
0.25
1.10
5.80
11.50
25.00
50.00
250
0.40
1.50
7.30
12.00
26.10
51.50
500
0.50
1.60
7.50
13.80
27.00
52.50
Carbonate
50
1.00
1.50
6.00
11.40
27.00
54.00
250
1.15
1.70
6.40
12.00
29.00
58.00
500
1.20
1.70
6.70
12.50
29.00
59.50
Chloride
50
1.30
1.30
5.80
11.50
27.00
52.00
250
2.50
2.10
7.00
13.20
28.00
56.00
500
3.60
3.00
8.00
15.20
30.00
59.10
1000
5.20
4.80
9.80
17.00
34.00
64.20
Sulphate
50
0.20
1.00
4.90
10.40
25.00
50.00
200
0.30
1.10
5.00
10.10
25.10
50.00
500
0.60
1.00
5.00
10.00
25.20
49.70
1000
0.70
0.90
4.80
9.80
24.90
49.30
Source: Reproduced with permission from the American Waterworks Association [452]
Nitrite is seldom present in high concentrations in borehole water. As to the strongly
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