Chemistry Reference
In-Depth Information
Table 6.2
Chromatographic conditions and method detection limits in reagent water
Analyte
Retention
1
time
(min)
Relative retention
time
Method
2
Detection limit
mg L
−1
Fluoride
1.2
1.0
0.005
Chloride
3.4
2.8
0.015
Nitrite-N
4.5
3.8
0.004
O-phosphate-P
9.0
7.5
0.061
Nitrate-N
11.3
9.4
0.013
Sulphate
21.4
17.8
0.206
Standard conditions:
Columns as specified in 6.2. Detector as specified in 6.2. Eluent as specified in 7.3. Sample loop
100µL Pump volume 2.30mL min
−1
1
Concentrations of mixed standard (mg L
−1
)
Fluoride 3.0
Chloride 4.0
Nitrate-N 30.0
O-phosphate-P 9.0
Nitrite-N 10.0
Sulphate 50.0
2
MDL calculated from data obtained using an attenuator setting of 1 µMHO full scale. Other
settings would produce an MDL proportional to their value
Source: Reproduced with permission from the Environmental Protection Agency [12]
Table 6.3
Single-operator accuracy and precision, determinations in surface water
Analyte
Spike
(mg
L
−1
)
No. of
replicates
Mean recovery
(%)
Standard deviation
(mg
L
−1
)
Chloride
1.0
7
105.0
0.139
Fluoride
0.50
7
74.0
0.0038
Nitrate-N
0.50
7
100.0
0.0058
Nitrite-N
0.51
7
88.2
0.0053
O-phosphate-
P
0.51
7
94.1
0.020
Sulphate
10.0
7
111.6
0.709
Source: Reproduced with permission from the Environmental Protection Agency [12]
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