Table 5.
Results of statistical testing for analytical precision in constituent data for the Quality of Water Service Unit laboratory[DIS, dissolved; --, acceptable results; 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; LOP, statistically significant lack of precision]
|
Constituent and method of analysis |
p-value |
Results from 1997 |
Constituent and method of analysis |
p-value |
Results from 1997 |
|
NUTRIENT CONSTITUENTS |
|||||
|
Ammonia as nitrogen (DIS) |
0.85760 |
-- |
Orthophosphate as phosphorus (DIS) |
0.26416 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (DIS) |
0.88982 |
-- |
Phosphorus (DIS) |
0.02218 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (WWR) |
0.98348 |
-- |
Phosphorus (WWR) |
0.01230 |
-- |
|
Nitrate plus nitrite as nitrogen (DIS) |
0.88982 |
-- |
|||
|
INORGANIC CONSTITUENTS |
|||||
|
Alkalinity (WWR, TITR) |
0.79313 |
-- |
Magnesium (DIS, ICP-AES) |
0.98170 |
-- |
|
Aluminum (DIS, ICP-AES) |
0.72261 |
-- |
Manganese (DIS, ICP-AES) |
0.66504 |
-- |
|
Aluminum (WWR, ICP-AES) |
0.70801 |
-- |
Manganese (WWR, ICP-AES) |
0.82518 |
-- |
|
Arsenic (WWR, GF-AAS) |
0.78536 |
-- |
Mercury (WWR, CV-AAS) |
0.51233 |
-- |
|
Barium (DIS, GF-AAS) |
0.36975 |
-- |
Nickel (DIS, ICP-AES) |
0.73648 |
-- |
|
Barium (DIS, ICP-AES) |
0.58188 |
-- |
Nickel (WWR, GF-AAS) |
0.43120 |
-- |
|
Barium (WWR, ICP-AES) |
0.70801 |
-- |
Nickel (WWR, ICP-AES) |
0.70801 |
-- |
|
Cadmium (WWR, GF-AAS) |
0.82518 |
-- |
Potassium (DIS, F-AAS) |
0.91033 |
-- |
|
Calcium (DIS, ICP-AES) |
0.90658 |
-- |
Selenium (WWR, GF-AAS) |
0.36975 |
-- |
|
Chloride (DIS, IC) |
0.93005 |
-- |
Silica (DIS, ICP-AES) |
0.94895 |
-- |
|
Chromium (DIS, ICP-AES) |
0.73648 |
-- |
Silver (DIS, GF-AAS, LIS) |
0.55987 |
-- |
|
Chromium (WWR, ICP-AES) |
0.72261 |
-- |
Silver (DIS, ICP-AES) |
0.26491 |
-- |
|
Copper (DIS, ICP-AES) |
0.73648 |
-- |
Silver (WWR, ICP-AES) |
0.51233 |
-- |
|
Copper (WWR, GF-AAS) |
0.43120 |
-- |
Silver (WWR, ICP-AES/T) |
0.40126 |
-- |
|
Copper (WWR, ICP-AES) |
0.70801 |
-- |
Sodium (DIS, F-AAS) |
0.36110 |
-- |
|
Dissolved solids (DIS, GRAV) |
0.94895 |
-- |
Strontium (DIS, ICP-AES) |
0.35762 |
-- |
|
Fluoride (DIS, ISE) |
0.98722 |
-- |
Strontium (DIS, ICP-AES/T) |
0.00493 |
LOP |
|
Iron (DIS, ICP-AES) |
0.97096 |
-- |
Strontium (WWR, ICP-AES) |
0.51233 |
-- |
|
Iron (WWR, ICP-AES) |
0.65944 |
-- |
Strontium (WWR, ICP-AES/T) |
0.40126 |
-- |
|
Iron (WWR, ICP-AES/T) |
0.53671 |
-- |
Sulfate (DIS, IC) |
0.98722 |
-- |
|
Lead (DIS, GF-AAS) |
0.72261 |
-- |
Zinc (DIS, ICP-AES) |
0.73648 |
-- |
|
Lead (WWR, GF-AAS) |
0.49635 |
-- |
Zinc (WWR, ICP-AES) |
0.82518 |
-- |
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