Table 2.
Total number of analyses from quality-assurance samples during water year 1997 with number greater than two and six standard deviations from the most probable value for the National Water Quality Laboratory[>2SD, number of analyses greater than 2 or less than –2 standard deviations from the most probable value; >6SD, number of analyses greater than 6 or less than –6 standard deviations from the most probable value; DIS, dissolved; COL, colorimetric; LIS, low ionic strength; ASF, micro-Kjeldahl digestion, automated segmented flow, colorimetric; USEPA, U.S. Environmental Protection Agency; WWR, whole-water recoverable; TITR, electrometric titration; ICP-AES, inductively coupled plasma-atomic emission spectrometry; ICP-MS, inductively coupled plasma-mass spectrometry; DCP-AES, direct current plasma-atomic emission spectrometry; HG-AAS, hydride generation-atomic absorption spectrophotometry; F-AAS, flame-atomic absorption spectrophotometry; GF-AAS, graphite furnace-atomic absorption spectrophotometry; IC, ion chromatography; GRAV, gravimetric; ISE, ion-selective electrode; CV-AAS, cold vapor-atomic absorption spectrophotometry; ELEC, electrometric]
|
Constituent and method of analysis |
Number of analyses |
Constituent and method of analysis |
Number of analyses |
||||
|
Total |
>2SD |
>6SD |
Total |
>2SD |
>6SD |
||
|
NUTRIENT CONSTITUENTS |
|||||||
|
Ammonia as nitrogen (DIS, COL) |
111 |
4 |
0 |
Nitrate plus nitrite as nitrogen (DIS, USEPA) |
22 |
0 |
0 |
|
Ammonia as nitrogen (DIS, COL, LIS) |
24 |
1 |
0 |
Orthophosphate as phosphorus (DIS, COL) |
112 |
8 |
0 |
|
Ammonia plus organic nitrogen as nitrogen (DIS, ASF) |
101 |
1 |
0 |
Orthophosphate as phosphorus (DIS, COL, LIS) |
24 |
3 |
2 |
|
Ammonia plus organic nitrogen as nitrogen (DIS, USEPA) |
22 |
0 |
0 |
Phosphorus (DIS, ASF) |
42 |
3 |
0 |
|
Ammonia plus organic nitrogen as nitrogen (WWR, ASF) |
109 |
0 |
0 |
Phosphorus (DIS, USEPA) |
10 |
2 |
0 |
|
Ammonia plus organic nitrogen as nitrogen (WWR, USEPA) |
22 |
0 |
0 |
Phosphorus (WWR, ASF) |
50 |
16 |
0 |
|
Nitrate plus nitrite as nitrogen (DIS, COL) |
209 |
3 |
0 |
Phosphorus (WWR, USEPA) |
10 |
2 |
0 |
|
Nitrate plus nitrite as nitrogen (DIS, COL, LIS) |
24 |
5 |
1 |
||||
|
INORGANIC CONSTITUENTS |
|||||||
|
Alkalinity (WWR,TITR) |
242 |
0 |
0 |
Lead (DIS, GF-AAS) |
93 |
0 |
0 |
|
Aluminum (DIS, ICP-AES) |
71 |
0 |
0 |
Lead (DIS, ICP-AES) |
97 |
20 |
0 |
|
Aluminum (DIS, ICP-MS) |
48 |
0 |
0 |
Lead (DIS, ICP-MS) |
48 |
0 |
0 |
|
Aluminum (WWR, DCP-AES) |
47 |
2 |
1 |
Lead (WWR, GF-AAS) |
94 |
1 |
1 |
|
Antimony (DIS, HG-AAS) |
24 |
4 |
0 |
Lithium (DIS, ICP-AES) |
119 |
0 |
0 |
|
Antimony (DIS, ICP-MS) |
48 |
0 |
0 |
Magnesium (DIS, ICP-AES) |
244 |
3 |
0 |
|
Arsenic (DIS, HG-AAS) |
165 |
37 |
1 |
Magnesium (DIS, ICP-AES, LIS) |
8 |
0 |
0 |
|
Arsenic (WWR, GF-AAS, USEPA) |
22 |
0 |
0 |
Manganese (DIS, ICP-AES) |
214 |
7 |
1 |
|
Arsenic (WWR, HG-AAS) |
45 |
18 |
1 |
Manganese (DIS, ICP-MS) |
48 |
0 |
0 |
|
Barium (DIS, ICP-AES) |
120 |
0 |
0 |
Manganese (WWR, F-AAS) |
45 |
0 |
0 |
|
Barium (DIS, ICP-MS) |
48 |
0 |
0 |
Mercury (DIS, CV-AAS) |
93 |
3 |
1 |
|
Barium (WWR, F-AAS) |
22 |
0 |
0 |
Mercury (WWR, CV-AAS) |
45 |
7 |
2 |
|
Beryllium (DIS, ICP-AES) |
119 |
1 |
0 |
Molybdenum (DIS, ICP-AES) |
97 |
2 |
0 |
|
Beryllium (DIS, ICP-MS) |
48 |
0 |
0 |
Molybdenum (DIS, ICP-MS) |
48 |
0 |
0 |
|
Beryllium (WWR, F-AAS) |
23 |
3 |
0 |
Nickel (DIS, GF-AAS) |
93 |
1 |
0 |
|
Boron (DIS, ICP-AES) |
215 |
0 |
0 |
Nickel (DIS, ICP-AES) |
97 |
2 |
0 |
|
Cadmium (DIS, GF-AAS) |
93 |
2 |
1 |
Nickel (DIS, ICP-MS) |
48 |
0 |
0 |
|
Cadmium (DIS, ICP-AES) |
97 |
11 |
0 |
Nickel (WWR, GF-AAS) |
45 |
0 |
0 |
|
Cadmium (DIS, ICP-MS) |
48 |
0 |
0 |
Potassium (DIS, F-AAS) |
242 |
8 |
3 |
|
Cadmium (WWR, GF-AAS) |
94 |
2 |
1 |
Potassium (DIS, F-AAS, LIS) |
23 |
2 |
2 |
|
Calcium (DIS, ICP-AES) |
246 |
2 |
0 |
Selenium (DIS, HG-AAS) |
165 |
6 |
0 |
|
Chloride (DIS, IC) |
243 |
2 |
1 |
Selenium (WWR, GF-AAS, USEPA) |
22 |
0 |
0 |
|
Chloride (DIS, IC, LIS) |
22 |
0 |
0 |
Selenium (WWR, HG-AAS) |
45 |
1 |
0 |
|
Chromium (DIS, GF-AAS) |
106 |
0 |
0 |
Silica (DIS, COL) |
242 |
5 |
2 |
|
Chromium (DIS, ICP-AES) |
97 |
2 |
0 |
Silica (DIS, ICP-AES) |
241 |
0 |
0 |
|
Chromium (DIS, ICP-MS) |
48 |
0 |
0 |
Silver (DIS, GF-AAS) |
71 |
0 |
0 |
|
Chromium (WWR, GF-AAS) |
45 |
0 |
0 |
Silver (DIS, ICP-AES) |
97 |
18 |
0 |
|
Cobalt (DIS, GF-AAS) |
22 |
0 |
0 |
Silver (DIS, ICP-MS) |
48 |
0 |
0 |
|
Cobalt (DIS, ICP-AES) |
97 |
0 |
0 |
Silver (WWR, GF-AAS) |
45 |
0 |
0 |
|
Cobalt (DIS, ICP-MS) |
48 |
0 |
0 |
Sodium (DIS, ICP-AES) |
246 |
2 |
0 |
|
Cobalt (WWR, GF-AAS) |
23 |
0 |
0 |
Sodium (DIS, ICP-AES, LIS) |
8 |
0 |
0 |
|
Copper (DIS, GF-AAS) |
93 |
0 |
0 |
Specific conductance (WWR, ELEC, LIS) |
23 |
4 |
0 |
|
Copper (DIS, ICP-AES) |
97 |
0 |
0 |
Strontium (DIS, ICP-AES) |
119 |
0 |
0 |
|
Copper (DIS, ICP-MS) |
48 |
0 |
0 |
Sulfate (DIS, IC) |
242 |
2 |
0 |
|
Copper (WWR, GF-AAS) |
94 |
0 |
0 |
Sulfate (DIS, IC, LIS) |
23 |
0 |
0 |
|
Dissolved solids (DIS, GRAV) |
242 |
6 |
0 |
Vanadium (DIS, COL) |
21 |
0 |
0 |
|
Fluoride (DIS, IC, LIS) |
23 |
2 |
0 |
Vanadium (DIS, ICP-AES) |
97 |
1 |
0 |
|
Fluoride (DIS, ISE) |
242 |
1 |
0 |
Zinc (DIS, ICP-AES) |
119 |
4 |
0 |
|
Iron (DIS, ICP-AES) |
239 |
1 |
0 |
Zinc (DIS, ICP-MS) |
48 |
0 |
0 |
|
Iron (WWR, F-AAS) |
94 |
2 |
1 |
Zinc (WWR, F-AAS) |
94 |
0 |
0 |
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