Environmental Engineering Reference
In-Depth Information
Ammonia (mg/L)
Phenate method, Salicylate method,
Ammonia selective electrode
Plastic,
glass
500
Reduce pH
2by
addition of H
2
SO
4
and refrigerate
7 days
1, 12, 13
<
Nitrate (mg/L)
Cadmium reduction method
Plastic,
glass
100
Refrigerate
48 h
14
Nitrite (mg/L)
Diazotization colorimetric method
Plastic,
glass
100
Refrigerate
48 h
15
Total Nitrogen
(mg/L)
Persulfate digestion followed by nitrate
determination
Plastic,
glass
500
Refrigerate
48 h
16
Total phosphorous
(mg/L)
Persulfate digestion followed by ortho-
phosphate determination
Plastic,
glass
100
Reduce pH
<
2by
addition of H
2
SO
4
and refrigerate
28 days
17
Orthophosphate
(mg/L)
Ascorbic acid method
Acid
washed
glass
100
For dissolved- filter
immediately and
refrigerate
48 h
18
All information on sample collection, sample size, preservation, and storage from APHA, AWWA and WEF (
2005
). Method summaries based on those listed here or
alternative procedures can also be accessed on the USEPA website at
http://water.epa.gov/scitech/methods/cwa/methods_index.cfm
a
Manufacturers manual for meters; 1: Wetzel and Likens (
2000
); 2: Hauer and Hill (
2007
); 3: APHA, AWWA and WEF (
2005
) Method 4500-OA-G; 4: APHA,
AWWA and WEF (
2005
) Method 4500-H
+
; 5: APHA, AWWA and WEF (
2005
) Method 2510 A-B; 6: APHA, AWWA and WEF (
2005
) Method 2520B; 7: APHA,
AWWA andWEF (
2005
) Method 2340C; 8: APHA, AWWA and WEF (
2005
) Method 2320; 9: APHA, AWWA and WEF (
2005
) Method 2130; 10: APHA, AWWA and
WEF (
2005
) Method 2540C; 11: APHA, AWWA and WEF (
2005
) Method 2540D; 12: APHA, AWWA and WEF (2005) Method 4500-NH
3
; 13: Reardon et al. (
1966
);
14: APHA, AWWA and WEF (
2005
) Method 4500-NO
3
E; 15: APHA, AWWA and WEF (
2005
) Method 4500-NO
2
; 16: APHA, AWWA and WEF (
2005
) Method
4500-N C; 17: APHA, AWWA and WEF (
2005
) Method 4500-P B,E; 18: APHA, AWWA and WEF (
2005
) Method 4500-P E
