Standard reference sample most probable values for the Fall 2003 inter-laboratory comparison | |||||||||||
[MPV, most probable value; n, number of samples; mg/L, micrograms per liter; mg/L, milligrams per liter; mS/cm, microsiemens per centimeter at 25 degrees Celcius; ( ), rating criterion.] | |||||||||||
T-175 | |||||||||||
Analyte = | Silver (Ag) | Aluminum (Al) | Arsenic (As) | Boron (B) | Barium (Ba) | ||||||
MPV = | 1.85 | mg/L | 52.0 | mg/L | 7.38 | mg/L | 48.3 | mg/L | 18.0 | mg/L | |
F-pseudosigma = | 0.193 | 5.63 | 0.448 | 4.00 | 0.67 | (0.90) | |||||
n = | 33 | 46 | 43 | 37 | 49 | ||||||
Analyte = | Beryllium (Be) | Calcium (Ca) | Cadmium (Cd) | Cobalt (Co) | Chromium (Cr) | ||||||
MPV = | 2.92 | mg/L | 8.76 | mg/L | 8.20 | mg/L | 7.44 | mg/L | 1.93 | mg/L | |
F-pseudosigma = | 0.148 | 0.241 | (0.438) | 0.334 | (0.410) | 0.326 | (0.372) | 0.133 | |||
n = | 43 | 55 | 54 | 41 | 35 | ||||||
Analyte = | Copper (Cu) | Iron (Fe) | Potassium (K) | Lithium (Li) | Magnesium (Mg) | ||||||
MPV = | 1.85 | mg/L | 39.0 | mg/L | 3.83 | mg/L | 3.20 | mg/L | 2.03 | mg/L | |
F-pseudosigma = | 0.189 | 4.89 | 0.133 | (0.192) | 0.214 | 0.089 | (0.102) | ||||
n = | 31 | 45 | 54 | 21 | 54 | ||||||
Analyte = | Manganese (Mn) | Molybdenum (Mo) | Sodium (Na) | Nickel (Ni) | Lead (Pb) | ||||||
MPV = | 49.4 | mg/L | 1.79 | mg/L | 8.63 | mg/L | 3.18 | mg/L | 3.00 | mg/L | |
F-pseudosigma = | 2.08 | (2.47) | 0.104 | 0.385 | (0.431) | 0.193 | 0.219 | ||||
n = | 56 | 25 | 54 | 34 | 44 | ||||||
Analyte = | Antimony (Sb) | Selenium (Se) | Silica (SiO2) | Strontium (Sr) | Thallium (Tl) | ||||||
MPV = | 1.90 | mg/L | 2.10 | mg/L | 5.60 | mg/L | 63.6 | mg/L | 1.97 | mg/L | |
F-pseudosigma = | 0.104 | 0.289 | 0.341 | 2.15 | (3.18) | 0.111 | |||||
n = | 26 | 28 | 37 | 42 | 31 | ||||||
Analyte = | Uranium (U) | Vanadium (V) | Zinc (Zn) | ||||||||
MPV = | 1.48 | mg/L | 2.94 | mg/L | 71.6 | mg/L | |||||
F-pseudosigma = | 0.117 | 0.234 | 2.97 | (3.58) | |||||||
n = | 19 | 31 | 55 | ||||||||
M-168 | |||||||||||
Analyte = | Alkalinity | Boron (B) | Calcium (Ca) | Chloride (Cl) | Fluoride (F) | ||||||
MPV = | 28.2 | mg/L | 81.4 | mg/L | 11.1 | mg/L | 9.50 | mg/L | 0.840 | mg/L | |
F-pseudosigma = | 2.25 | 4.52 | 0.32 | (0.56) | 0.541 | 0.0485 | |||||
n = | 58 | 29 | 60 | 65 | 51 | ||||||
Residue on | |||||||||||
Analyte = | Potassium (K) | Magnesium (Mg) | Sodium (Na) | pH | Evaporation | ||||||
MPV = | 1.64 | mg/L | 7.70 | mg/L | 10.1 | mg/L | 9.30 | 108 | mg/L | ||
F-pseudosigma = | 0.082 | 0.234 | (0.385) | 0.35 | (0.51) | 0.208 | (0.465) | 14.1 | |||
n = | 56 | 59 | 57 | 57 | 40 | ||||||
Specific | Total Phosphorus | ||||||||||
Analyte = | Silica (SiO2) | Sulfate (SO4) | Conductance | Strontium (Sr) | as P | ||||||
MPV = | 5.20 | mg/L | 25.0 | mg/L | 182 | mS/cm | 70.2 | mg/L | 0.132 | mg/L | |
F-pseudosigma = | 0.334 | 1.04 | (1.25) | 4.0 | (9.1) | 2.52 | (3.51) | 0.0133 | |||
n = | 50 | 66 | 58 | 36 | 43 | ||||||
Analyte = | Vanadium (V) | ||||||||||
MPV = | 7.80 | mg/L | |||||||||
F-pseudosigma = | 0.460 | ||||||||||
n = | 25 | ||||||||||
N-79 | Ammonia | Ammonia + | Nitrate | Nitrite + Nitrate | Total Phosphorus | ||||||
Analyte = | as N (NH3-N) | Organic N as N | as N (NO3-N) | as N (NO2+NO3-N) | as P | ||||||
MPV = | 0.100 | mg/L | 0.149 | mg/L | 0.130 | mg/L | 0.131 | mg/L | 0.149 | mg/L | |
F-pseudosigma = | 0.0096 | 0.0519 | 0.0100 | 0.0093 | 0.0096 | ||||||
n = | 50 | 32 | 39 | 40 | 52 | ||||||
Orthophosphate | |||||||||||
Analyte = | as P (PO4-P) | ||||||||||
MPV = | 0.102 | mg/L | |||||||||
F-pseudosigma = | 0.0066 | ||||||||||
n = | 51 | ||||||||||
N-80 | Ammonia | Ammonia + | Nitrate | Nitrite + Nitrate | Total Phosphorus | ||||||
Analyte = | as N (NH3-N) | Organic N as N | as N (NO3-N) | as N (NO2+NO3-N) | as P | ||||||
MPV = | 0.620 | mg/L | 0.787 | mg/L | 0.893 | mg/L | 0.888 | mg/L | 1.00 | mg/L | |
F-pseudosigma = | 0.0578 | 0.0782 | 0.0363 | (0.0447) | 0.0352 | (0.0444) | 0.030 | (0.050) | |||
n = | 49 | 36 | 42 | 39 | 48 | ||||||
Orthophosphate | |||||||||||
Analyte = | as P (PO4-P) | ||||||||||
MPV = | 0.788 | mg/L | |||||||||
F-pseudosigma = | 0.1312 | ||||||||||
n = | 49 | ||||||||||
P-41 | |||||||||||
Analyte = | Calcium (Ca) | Chloride (Cl) | Fluoride (F) | Potassium (K) | Magnesium (Mg) | ||||||
MPV = | 0.550 | mg/L | 5.88 | mg/L | 0.107 | mg/L | 0.072 | mg/L | 0.054 | mg/L | |
F-pseudosigma = | 0.0200 | (0.0275) | 0.296 | 0.0236 | 0.0141 | 0.0059 | |||||
n = | 27 | 29 | 18 | 16 | 22 | ||||||
Orthophosphate | Specific | ||||||||||
Analyte = | Sodium (Na) | pH | as P (PO4-P) | Sulfate (SO4) | Conductance | ||||||
MPV = | 0.480 | mg/L | 3.94 | 0.046 | mg/L | 0.320 | mg/L | 58.7 | mS/cm | ||
F-pseudosigma = | 0.0222 | (0.0240) | 0.082 | (0.197) | 0.0049 | 0.3551 | 2.30 | (2.94) | |||
n = | 25 | 30 | 18 | 23 | 27 | ||||||
Hg-37 | |||||||||||
Analyte = | Mercury (Hg) | ||||||||||
MPV = | 0.044 | mg/L | |||||||||
F-pseudosigma = | 0.0030 | ||||||||||
n = | 14 |