Table
2. 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 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; WWR, whole-water recoverable; TITR, electrometric titration; --,
acceptable results; DIS, dissolved; 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; GF-AAS, graphite furnace-atomic
absorption spectrophotometry; USEPA, U.S. Environmental Protection Agency; IC,
ion chromatography; LL, low level; GRAV, gravimetric; ISE, ion-selective
electrode; F-AAS, flame-atomic absorption spectrophotometry; CV-AAS, cold
vapor-atomic absorption spectrophotometry; LOP, statistically significant lack
of precision; ELEC, electrometric; COL, colorimetric; ASF, micro-Kjeldahl
digestion, automated segmented flow, colorimetric]
|
|
Constituent
and method
of analysis |
Number of analyses |
p-value |
Results from 1998 |
|||
|
|
Total |
>2SD |
>6SD |
||||
|
|
INORGANIC CONSTITUENTS
|
||||||
|
Alkalinity (WWR,TITR) |
241 |
1 |
0 |
1.00000 |
-- |
||
|
Aluminum (DIS, ICP-AES) |
31 |
0 |
0 |
0.79609 |
-- |
||
|
Aluminum (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Aluminum (WWR, DCP-AES) |
37 |
5 |
1 |
0.03593 |
-- |
||
|
Antimony (DIS, HG-AAS) |
12 |
1 |
0 |
0.45964 |
-- |
||
|
Antimony (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Arsenic (DIS, HG-AAS) |
72 |
1 |
0 |
0.97511 |
-- |
||
|
Arsenic (WWR, GF-AAS, USEPA) |
8 |
0 |
0 |
0.33658 |
-- |
||
|
Arsenic (WWR, HG-AAS) |
41 |
0 |
0 |
0.87791 |
-- |
||
|
Barium (DIS, ICP-AES) |
97 |
0 |
0 |
0.99309 |
-- |
||
|
Barium (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Beryllium (DIS, ICP-AES) |
73 |
0 |
0 |
0.97635 |
-- |
||
|
Beryllium (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Boron (DIS, ICP-AES) |
161 |
0 |
0 |
0.99974 |
-- |
||
|
Boron (WWR, DCP-AES) |
12 |
1 |
0 |
0.45964 |
|
||
|
Cadmium (DIS, GF-AAS) |
48 |
1 |
0 |
0.91474 |
-- |
||
|
Cadmium (DIS, ICP-AES) |
62 |
2 |
0 |
0.82275 |
-- |
||
|
Cadmium (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Cadmium (WWR, GF-AAS) |
73 |
2 |
1 |
0.88549 |
-- |
||
|
Calcium (DIS, ICP-AES) |
241 |
0 |
0 |
1.00000 |
-- |
||
|
Chloride (DIS, IC) |
241 |
4 |
0 |
0.99816 |
-- |
||
|
Chloride (DIS, IC, LL) |
12 |
1 |
1 |
0.45964 |
-- |
||
|
Chromium (DIS, GF-AAS) |
48 |
1 |
0 |
0.91474 |
-- |
||
|
Chromium (DIS, ICP-AES) |
59 |
0 |
0 |
0.95151 |
-- |
||
|
Chromium (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Chromium (WWR, GF-AAS) |
49 |
0 |
0 |
0.91901 |
-- |
||
|
Cobalt (DIS, GF-AAS) |
8 |
0 |
0 |
0.33658 |
-- |
||
|
Cobalt (DIS, ICP-AES) |
29 |
3 |
0 |
0.17512 |
-- |
||
|
Cobalt (DIS, ICP-MS) |
64 |
0 |
0 |
0.96248 |
-- |
||
|
Cobalt (WWR, GF-AAS) |
25 |
0 |
0 |
0.72261 |
-- |
||
|
Copper (DIS, GF-AAS) |
37 |
0 |
0 |
0.85011 |
-- |
||
|
Copper (DIS, ICP-AES) |
49 |
0 |
0 |
0.91901 |
-- |
||
|
Copper (DIS, ICP-MS) |
64 |
0 |
0 |
0.96248 |
-- |
||
|
Copper (WWR, GF-AAS) |
54 |
2 |
1 |
0.75921 |
-- |
||
|
Dissolved Solids (DIS, GRAV) |
239 |
4 |
0 |
0.99801 |
-- |
||
|
Fluoride (DIS, IC, LL) |
13 |
1 |
1 |
0.48666 |
-- |
||
|
Fluoride (DIS, ISE) |
236 |
3 |
0 |
0.99950 |
-- |
||
|
Iron (DIS, ICP-AES) |
191 |
0 |
0 |
0.99994 |
-- |
||
|
Iron (WWR, F-AAS) |
73 |
3 |
0 |
0.71332 |
-- |
||
|
Lead (DIS, GF-AAS) |
48 |
1 |
1 |
0.91474 |
-- |
||
|
Lead (DIS, ICP-AES) |
10 |
3 |
0 |
0.01150 |
-- |
||
|
Lead (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Lead (WWR, GF-AAS) |
73 |
2 |
0 |
0.88549 |
-- |
||
|
Lithium (DIS, ICP-AES) |
97 |
0 |
0 |
0.99309 |
-- |
||
|
Lithium (WWR, F-AAS) |
13 |
0 |
0 |
0.48666 |
-- |
||
|
Magnesium (DIS, ICP-AES) |
241 |
2 |
0 |
0.99994 |
-- |
||
|
Manganese (DIS, ICP-AES) |
191 |
0 |
0 |
0.99994 |
-- |
||
|
Manganese (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Manganese (WWR, F-AAS) |
43 |
0 |
0 |
0.88982 |
-- |
||
|
Mercury (DIS, CV-AAS) |
48 |
3 |
0 |
0.43295 |
-- |
||
|
Mercury (WWR, CV-AAS) |
48 |
6 |
3 |
0.03171 |
-- |
||
|
Molybdenum (DIS, GF-AAS) |
12 |
0 |
0 |
0.45964 |
-- |
||
|
Molybdenum (DIS, ICP-AES) |
16 |
2 |
0 |
0.18924 |
-- |
||
|
Molybdenum (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Molybdenum (WWR, GF-AAS) |
24 |
1 |
1 |
0.70801 |
-- |
||
|
Nickel (DIS, GF-AAS) |
24 |
1 |
0 |
0.70801 |
-- |
||
|
Nickel (DIS, ICP-AES) |
33 |
1 |
0 |
0.81597 |
-- |
||
|
Nickel (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Nickel (WWR, GF-AAS) |
49 |
2 |
1 |
0.71012 |
-- |
||
|
Potassium (DIS, F-AAS) |
241 |
6 |
2 |
0.98243 |
-- |
||
|
Potassium (DIS, F-AA, LL) |
13 |
0 |
0 |
0.48666 |
-- |
||
|
Selenium (DIS, HG-AAS) |
108 |
2 |
0 |
0.97375 |
-- |
||
|
Selenium (WWR, GF-AAS, USEPA) |
8 |
0 |
0 |
0.33658 |
-- |
||
|
Selenium (WWR, HG-AAS) |
41 |
0 |
0 |
0.87791 |
-- |
||
|
Silica (DIS, COL) |
120 |
4 |
2 |
0.85559 |
-- |
||
|
Silica (DIS, ICP-AES) |
240 |
0 |
0 |
1.00000 |
-- |
||
|
Silver (DIS, GF-AAS) |
16 |
0 |
0 |
0.55987 |
-- |
||
|
Silver (DIS, ICP-AES) |
30 |
2 |
0 |
0.44646 |
-- |
||
|
Silver (DIS, ICP-MS) |
64 |
11 |
0 |
0.00031 |
LOP |
||
|
Silver (WWR, GF-AAS) |
33 |
4 |
1 |
0.08081 |
-- |
||
|
Sodium (DIS, ICP-AES) |
241 |
0 |
0 |
1.00000 |
-- |
||
|
Specific Conductance (WWR, ELEC, LL) |
13 |
1 |
0 |
0.48666 |
-- |
||
|
Strontium (DIS, ICP-AES) |
97 |
0 |
0 |
0.99309 |
-- |
||
|
Sulfate (DIS, IC) |
241 |
1 |
0 |
1.00000 |
-- |
||
|
Vanadium (DIS, ICP-AES) |
52 |
0 |
0 |
0.93056 |
-- |
||
|
Zinc (DIS, ICP-AES) |
53 |
4 |
0 |
0.27287 |
-- |
||
|
Zinc (DIS, ICP-MS) |
96 |
0 |
0 |
0.99273 |
-- |
||
|
Zinc (WWR, F-AAS) |
73 |
1 |
0 |
0.97635 |
-- |
||
|
|
|||||||
NUTRIENT CONSTITUENTS
|
|||||||
|
Ammonia as nitrogen (DIS, COL) |
333 |
30 |
2 |
0.00153 |
LOP |
||
|
Ammonia as nitrogen (DIS, COL, LL) |
66 |
1 |
1 |
0.96613 |
-- |
||
|
Ammonia as nitrogen (DIS, USEPA) |
17 |
1 |
0 |
0.58188 |
-- |
||
|
Ammonia plus organic nitrogen as nitrogen
(DIS, ASF) |
334 |
5 |
1 |
0.99982 |
-- |
||
|
Ammonia plus organic nitrogen as nitrogen
(DIS, USEPA) |
34 |
0 |
0 |
0.82518 |
-- |
||
|
Ammonia plus organic nitrogen as nitrogen
(WWR, ASF) |
226 |
1 |
0 |
0.99999 |
-- |
||
|
Ammonia plus organic nitrogen as nitrogen
(WWR, USEPA) |
34 |
1 |
0 |
0.82518 |
-- |
||
|
Nitrate plus nitrite as nitrogen (DIS, COL) |
334 |
21 |
3 |
0.16875 |
-- |
||
|
Nitrate plus nitrite as nitrogen (DIS, COL,
LL) |
66 |
2 |
1 |
0.84850 |
-- |
||
|
Orthophosphate as phosphorus (DIS, COL) |
332 |
52 |
8 |
0.00000 |
LOP |
||
|
Orthophosphate as phosphorus (DIS, COL, LL) |
66 |
3 |
3 |
0.64727 |
-- |
||
|
Phosphorus (DIS, ASF) |
334 |
21 |
2 |
0.16875 |
-- |
||
|
Phosphorus (DIS, COL, LL) |
33 |
4 |
2 |
0.08081 |
-- |
||
|
Phosphorus (DIS, USEPA) |
34 |
1 |
0 |
0.82518 |
-- |
||
|
Phosphorus (WWR, ASF) |
226 |
3 |
0 |
0.99923 |
-- |
||
|
Phosphorus (WWR, COL, LL) |
65 |
5 |
3 |
0.22479 |
-- |
||
|
Phosphorus (WWR, USEPA) |
34 |
0 |
0 |
0.82518 |
-- |
||