Table 3.
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 Quality of Water Service Unit 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; WWR, whole-water recoverable; TITR, electrometric titration; GF-AAS, graphite furnace-atomic absorption spectrophotometry; ICP-AES, inductively coupled plasma-atomic emission spectrometry; IC, ion chromatography; GRAV, gravimetric; ISE, ion-selective electrode; ICP-AES/T, inductively coupled plasma-atomic emission spectrometry, trace; CV-AAS, cold vapor-atomic absorption spectrophotometry; F-AAS, flame-atomic absorption spectrophotometry; LIS, low-ionic strength]
|
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) |
38 |
0 |
0 |
Orthophosphate as phosphorus (DIS) |
20 |
2 |
0 |
|
Ammonia plus organic nitrogen as nitrogen (DIS) |
43 |
0 |
0 |
Phosphorus (DIS) |
22 |
4 |
0 |
|
Ammonia plus organic nitrogen as nitrogen (WWR) |
80 |
1 |
0 |
Phosphorus (WWR) |
39 |
6 |
0 |
|
Nitrate plus nitrite as nitrogen (DIS) |
43 |
0 |
0 |
||||
|
INORGANIC CONSTITUENTS |
|||||||
|
Alkalinity (WWR, TITR) |
58 |
2 |
0 |
Magnesium (DIS, ICP-AES) |
78 |
1 |
0 |
|
Aluminum (DIS, ICP-AES) |
25 |
0 |
0 |
Manganese (DIS, ICP-AES) |
45 |
2 |
0 |
|
Aluminum (WWR, ICP-AES) |
24 |
0 |
0 |
Manganese (WWR, ICP-AES) |
34 |
0 |
0 |
|
Arsenic (WWR, GF-AAS) |
30 |
1 |
0 |
Mercury (WWR, CV-AAS) |
34 |
2 |
1 |
|
Barium (DIS, GF-AAS) |
17 |
0 |
0 |
Nickel (DIS, ICP-AES) |
26 |
0 |
0 |
|
Barium (DIS, ICP-AES) |
9 |
0 |
0 |
Nickel (WWR, GF-AAS) |
11 |
0 |
0 |
|
Barium (WWR, ICP-AES) |
24 |
0 |
0 |
Nickel (WWR, ICP-AES) |
24 |
0 |
0 |
|
Cadmium (WWR, GF-AAS) |
34 |
0 |
0 |
Potassium (DIS, F-AAS) |
79 |
2 |
0 |
|
Calcium (DIS, ICP-AES) |
78 |
2 |
0 |
Selenium (WWR, GF-AAS) |
9 |
0 |
0 |
|
Chloride (DIS, IC) |
85 |
2 |
0 |
Silica (DIS, ICP-AES) |
58 |
0 |
0 |
|
Chromium (DIS, ICP-AES) |
26 |
0 |
0 |
Silver (DIS, GF-AAS, LIS) |
16 |
0 |
0 |
|
Chromium (WWR, ICP-AES) |
25 |
0 |
0 |
Silver (DIS, ICP-AES) |
6 |
0 |
0 |
|
Copper (DIS, ICP-AES) |
26 |
0 |
0 |
Silver (WWR, ICP-AES) |
14 |
0 |
0 |
|
Copper (WWR, GF-AAS) |
11 |
1 |
0 |
Silver (WWR, ICP-AES/T) |
10 |
0 |
0 |
|
Copper (WWR, ICP-AES) |
24 |
0 |
0 |
Sodium (DIS, F-AAS) |
79 |
5 |
0 |
|
Dissolved solids (DIS, GRAV) |
58 |
0 |
0 |
Strontium (DIS, ICP-AES) |
25 |
2 |
1 |
|
Fluoride (DIS, ISE) |
85 |
0 |
0 |
Strontium (DIS, ICP-AES/T) |
23 |
5 |
0 |
|
Iron (DIS, ICP-AES) |
69 |
1 |
0 |
Strontium (WWR, ICP-AES) |
14 |
0 |
0 |
|
Iron (WWR, ICP-AES) |
21 |
0 |
0 |
Strontium (WWR, ICP-AES/T) |
10 |
0 |
0 |
|
Iron (WWR, ICP-AES/T) |
15 |
0 |
0 |
Sulfate (DIS, IC) |
85 |
0 |
0 |
|
Lead (DIS, GF-AAS) |
25 |
0 |
0 |
Zinc (DIS, ICP-AES) |
26 |
1 |
0 |
|
Lead (WWR, GF-AAS) |
33 |
2 |
2 |
Zinc (WWR, ICP-AES) |
34 |
0 |
0 |
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