Table 4.
Results of statistical testing for analytical precision in constituent data for the National Water Quality Laboratory[DIS, dissolved; COL, colorimetric; --, acceptable results; LIS, low ionic strength; ASF, micro-Kjeldahl digestion, automated segmented flow, colorimetric; USEPA, U.S. Environmental Protection Agency; WWR, whole-water recoverable; LOP, statistically significant lack of precision; 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 |
p-value |
Results from 1997 |
Constituent and method of analysis |
p-value |
Results from 1997 |
|
NUTRIENT CONSTITUENTS |
|||||
|
Ammonia as nitrogen (DIS, COL) |
0.81110 |
-- |
Nitrate plus nitrite as nitrogen (DIS, USEPA) |
0.67647 |
-- |
|
Ammonia as nitrogen (DIS, COL, LIS) |
0.70801 |
-- |
Orthophosphate as phosphorus (DIS, COL) |
0.19840 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (DIS, ASF) |
0.99438 |
-- |
Orthophosphate as phosphorus (DIS, COL, LIS) |
0.11594 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (DIS, USEPA) |
0.67647 |
-- |
Phosphorus (DIS, ASF) |
0.35101 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (WWR, ASF) |
0.99627 |
-- |
Phosphorus (DIS, USEPA) |
0.08614 |
-- |
|
Ammonia plus organic nitrogen as nitrogen (WWR, USEPA) |
0.67647 |
-- |
Phosphorus (WWR, ASF) |
0.00000 |
LOP |
|
Nitrate plus nitrite as nitrogen (DIS, COL) |
0.99840 |
-- |
Phosphorus (WWR, USEPA) |
0.08614 |
-- |
|
Nitrate plus nitrite as nitrogen (DIS, COL, LIS) |
0.00597 |
LOP |
|||
|
INORGANIC CONSTITUENTS |
|||||
|
Alkalinity (WWR, TITR) |
1.00000 |
-- |
Lead (DIS, GF-AAS) |
0.99152 |
-- |
|
Aluminum (DIS, ICP-AES) |
0.97380 |
-- |
Lead (DIS, ICP-AES) |
0.00000 |
LOP |
|
Aluminum (DIS, ICP-MS) |
0.91474 |
-- |
Lead (DIS, ICP-MS) |
0.91474 |
-- |
|
Aluminum (WWR, DCP-AES) |
0.68825 |
-- |
Lead (WWR, GF-AAS) |
0.99195 |
-- |
|
Antimony (DIS, HG-AAS) |
0.02978 |
-- |
Lithium (DIS, ICP-AES) |
0.99777 |
-- |
|
Antimony (DIS, ICP-MS) |
0.91474 |
-- |
Magnesium (DIS, ICP-AES) |
0.99965 |
-- |
|
Arsenic (DIS, HG-AAS) |
0.00000 |
LOP |
Magnesium (DIS, ICP-AES, LIS) |
0.33658 |
-- |
|
Arsenic (WWR, GF-AAS, USEPA) |
0.67647 |
-- |
Manganese (DIS, ICP-AES) |
0.91376 |
-- |
|
Arsenic (WWR, HG-AAS) |
0.00000 |
LOP |
Manganese (DIS, ICP-MS) |
0.91474 |
-- |
|
Barium (DIS, ICP-AES) |
0.99788 |
-- |
Manganese (WWR, F-AAS) |
0.90056 |
-- |
|
Barium (DIS, ICP-MS) |
0.91474 |
-- |
Mercury (DIS, CV-AAS) |
0.84956 |
-- |
|
Barium (WWR, F-AAS) |
0.67647 |
-- |
Mercury (WWR, CV-AAS) |
0.00665 |
LOP |
|
Beryllium (DIS, ICP-AES) |
0.99777 |
-- |
Molybdenum (DIS, ICP-AES) |
0.95784 |
-- |
|
Beryllium (DIS, ICP-MS) |
0.91474 |
-- |
Molybdenum (DIS, ICP-MS) |
0.91474 |
-- |
|
Beryllium (WWR, F-AAS) |
0.10517 |
-- |
Nickel (DIS, GF-AAS) |
0.99152 |
-- |
|
Boron (DIS, ICP-AES) |
0.99998 |
-- |
Nickel (DIS, ICP-AES) |
0.95784 |
-- |
|
Cadmium (DIS, GF-AAS) |
0.95002 |
-- |
Nickel (DIS, ICP-MS) |
0.91474 |
-- |
|
Cadmium (DIS, ICP-AES) |
0.00922 |
LOP |
Nickel (WWR, GF-AAS) |
0.90056 |
-- |
|
Cadmium (DIS, ICP-MS) |
0.91474 |
-- |
Potassium (DIS, F-AAS) |
0.92016 |
-- |
|
Cadmium (WWR, GF-AAS) |
0.95210 |
-- |
Potassium (DIS, F-AAS, LIS) |
0.32058 |
-- |
|
Calcium (DIS, ICP-AES) |
0.99995 |
-- |
Selenium (DIS, HG-AAS) |
0.83749 |
-- |
|
Chloride (DIS, IC) |
0.99995 |
-- |
Selenium (WWR, GF-AAS, USEPA) |
0.67647 |
-- |
|
Chloride (DIS, IC, LIS) |
0.67647 |
-- |
Selenium (WWR, HG-AAS) |
0.90056 |
-- |
|
Chromium (DIS, GF-AAS) |
0.99565 |
-- |
Silica (DIS, COL) |
0.99388 |
-- |
|
Chromium (DIS, ICP-AES) |
0.95784 |
-- |
Silica (DIS, ICP-AES) |
1.00000 |
-- |
|
Chromium (DIS, ICP-MS) |
0.91474 |
-- |
Silver (DIS, GF-AAS) |
0.97380 |
-- |
|
Chromium (WWR, GF-AAS) |
0.90056 |
-- |
Silver (DIS, ICP-AES) |
0.00000 |
LOP |
|
Cobalt (DIS, GF-AAS) |
0.67647 |
-- |
Silver (DIS, ICP-MS) |
0.91474 |
-- |
|
Cobalt (DIS, ICP-AES) |
0.99309 |
-- |
Silver (WWR, GF-AAS) |
0.90056 |
-- |
|
Cobalt (DIS, ICP-MS) |
0.91474 |
-- |
Sodium (DIS, ICP-AES) |
0.99995 |
-- |
|
Cobalt (WWR, GF-AAS) |
0.69264 |
-- |
Sodium (DIS, ICP-AES, LIS) |
0.33658 |
-- |
|
Copper (DIS, GF-AAS) |
0.99152 |
-- |
Specific conductance (WWR, ELEC, LIS) |
0.02581 |
-- |
|
Copper (DIS, ICP-AES) |
0.99309 |
-- |
Strontium (DIS, ICP-AES) |
0.99777 |
-- |
|
Copper (DIS, ICP-MS) |
0.91474 |
-- |
Sulfate (DIS, IC) |
0.99994 |
-- |
|
Copper (WWR, GF-AAS) |
0.99195 |
-- |
Sulfate (DIS, IC, LIS) |
0.69264 |
-- |
|
Dissolved solids (DIS, GRAV) |
0.98299 |
-- |
Vanadium (DIS, COL) |
0.65944 |
-- |
|
Fluoride (DIS, IC, LIS) |
0.32058 |
-- |
Vanadium (DIS, ICP-AES) |
0.99309 |
-- |
|
Fluoride (DIS, ISE) |
1.00000 |
-- |
Zinc (DIS, ICP-AES) |
0.85113 |
-- |
|
Iron (DIS, ICP-AES) |
1.00000 |
-- |
Zinc (DIS, ICP-MS) |
0.91474 |
-- |
|
Iron (WWR, F-AAS) |
0.95210 |
-- |
Zinc (WWR, F-AAS) |
0.99195 |
-- |
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