Table 3.
Total number of analyses from quality-assurance samples during water year
1998 with the number greater than two and six standard deviations from the most
probable value and results of statistical testing for analytical precision in
constituent data 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; WWR, whole-water recoverable; TITR, electrometric titration; --,
acceptable results; DIS, dissolved; ICP-AES/T, inductively coupled plasma-atomic
emission spectrometry,trace; GF-AAS, graphite furnace-atomic absorption
spectrophotometry; USEPA, U.S. Environmental Protection Agency; ICP-AES,
inductively coupled plasma-atomic emission spectrometry; IC, ion chromatography;
GRAV, gravimetric; ISE, ion-selective electrode; CV-AAS, cold vapor-atomic
absorption spectrophotometry; F-AAS, flame-atomic absorption spectrophotometry]
|
|
Constituent
and method
of analysis |
Number of analyses |
p-value |
Results from 1998 |
||
|
|
Total |
>2SD |
>6SD |
|||
|
|
INORGANIC CONSTITUENTS
|
|||||
|
Alkalinity (WWR, TITR) |
65 |
1 |
1 |
0.96435 |
-- |
|
|
Aluminum (DIS, ICP-AES/T) |
24 |
0 |
0 |
0.70801 |
-- |
|
|
Aluminum (WWR, GF-AAS, USEPA) |
11 |
1 |
0 |
0.43120 |
-- |
|
|
Aluminum (WWR, ICP-AES/T) |
24 |
0 |
0 |
0.70801 |
-- |
|
|
Arsenic (DIS, GF-AAS) |
12 |
0 |
0 |
0.45964 |
-- |
|
|
Arsenic (WWR, GF-AAS) |
8 |
0 |
0 |
0.33658 |
-- |
|
|
Barium (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Barium (WWR, ICP-AES/T) |
12 |
0 |
0 |
0.45964 |
-- |
|
|
Beryllium (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Beryllium (WWR, ICP-AES/T) |
12 |
0 |
0 |
0.45964 |
-- |
|
|
Boron (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Cadmium (DIS, GF-AAS) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Cadmium (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Cadmium (WWR, GF-AAS) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Cadmium (WWR, ICP-AES/T) |
11 |
1 |
0 |
0.43120 |
-- |
|
|
Calcium (DIS, ICP-AES) |
90 |
2 |
0 |
0.94327 |
-- |
|
|
Calcium (DIS, ICP-AES/T) |
34 |
0 |
0 |
0.82518 |
-- |
|
|
Chloride (DIS, IC) |
89 |
0 |
0 |
0.98959 |
-- |
|
|
Chromium (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Chromium (WWR, GF-AAS) |
11 |
1 |
0 |
0.43120 |
-- |
|
|
Chromium (WWR, ICP-AES/T) |
10 |
1 |
0 |
0.40126 |
-- |
|
|
Cobalt (DIS, ICP-AES/T) |
8 |
0 |
0 |
0.33658 |
-- |
|
|
Copper (DIS, GF-AAS) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Copper (DIS, ICP-AES/T) |
8 |
0 |
0 |
0.33658 |
-- |
|
|
Copper (WWR, GF-AAS) |
9 |
0 |
0 |
0.36975 |
-- |
|
|
Copper (WWR, ICP-AES/T) |
12 |
0 |
0 |
0.45964 |
-- |
|
|
Dissolved Solids (DIS, GRAV) |
65 |
2 |
0 |
0.84240 |
-- |
|
|
Fluoride (DIS, ISE) |
76 |
0 |
0 |
0.97972 |
-- |
|
|
Iron (DIS, ICP-AES/T) |
44 |
1 |
1 |
0.89533 |
-- |
|
|
Iron (WWR, ICP-AES/T) |
45 |
2 |
0 |
0.66504 |
-- |
|
|
Lead (DIS, GF-AAS) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Lead (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Lead (WWR, GF-AAS) |
11 |
2 |
1 |
0.10189 |
-- |
|
|
Lead (WWR, ICP-AES/T) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Magnesium (DIS, ICP-AES) |
90 |
0 |
0 |
0.99011 |
-- |
|
|
Magnesium (DIS, ICP-AES/T) |
34 |
1 |
0 |
0.82518 |
-- |
|
|
Manganese (DIS, ICP-AES/T) |
44 |
0 |
0 |
0.89533 |
-- |
|
|
Manganese (WWR, ICP-AES/T) |
35 |
2 |
0 |
0.52797 |
-- |
|
|
Mercury (WWR, CV-AAS) |
21 |
0 |
0 |
0.65944 |
-- |
|
|
Molybdenum (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Nickel (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Nickel (WWR, GF-AAS) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Nickel (WWR, ICP-AES/T) |
12 |
0 |
0 |
0.45964 |
-- |
|
|
Potassium (DIS, F-AAS) |
90 |
0 |
0 |
0.99011 |
-- |
|
|
Selenium (DIS, GF-AAS) |
11 |
0 |
0 |
0.43120 |
-- |
|
|
Selenium (WWR, GF-AAS) |
8 |
0 |
0 |
0.33658 |
-- |
|
|
Silica (DIS, ICP-AES) |
66 |
0 |
0 |
0.96613 |
-- |
|
|
Silica (DIS, ICP-AES/T) |
34 |
0 |
0 |
0.82518 |
-- |
|
|
Silver (DIS, ICP-AES/T) |
8 |
0 |
0 |
0.33658 |
-- |
|
|
Sodium (DIS, F-AAS) |
90 |
0 |
0 |
0.99011 |
-- |
|
|
Strontium (DIS, ICP-AES/T) |
20 |
0 |
0 |
0.64151 |
-- |
|
|
Strontium (WWR, ICP-AES/T) |
12 |
1 |
0 |
0.45964 |
-- |
|
|
Sulfate (DIS, IC) |
89 |
0 |
0 |
0.98959 |
-- |
|
|
Vanadium (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Zinc (DIS, ICP-AES/T) |
10 |
0 |
0 |
0.40126 |
-- |
|
|
Zinc (WWR, ICP-AES/T) |
22 |
0 |
0 |
0.67647 |
-- |
|
|
|
||||||
NUTRIENT CONSTITUENTS
|
||||||
|
Ammonia as nitrogen (DIS) |
39 |
2 |
1 |
0.58705 |
-- |
|
|
Ammonia plus organic nitrogen as nitrogen
(DIS) |
41 |
0 |
0 |
0.87791 |
-- |
|
|
Ammonia plus organic nitrogen as nitrogen
(WWR) |
64 |
0 |
0 |
0.96248 |
-- |
|
|
Nitrate plus nitrite as nitrogen (DIS) |
39 |
1 |
0 |
0.86472 |
-- |
|
|
Orthophosphate as phosphorus (DIS) |
39 |
1 |
0 |
0.86472 |
-- |
|
|
Phosphorus as phosphorus (DIS) |
41 |
1 |
0 |
0.87791 |
-- |
|
|
Phosphorus as phosphorus (WWR) |
64 |
3 |
1 |
0.62653 |
-- |
|