Review of Trace Element Blank and Replicate Data Collected in Ground and Surface Water for the National Water-Quality Assessment Program, 1991–2002
By
Lori E. Apodaca1, David K. Mueller2 and Michael T. Koterba3
Table 4
Estimated sample variability at measured concentrations in ground-water trace element data.
[pCi/L, picocuries per liter;
RSD, relative standard deviation;
SD, standard deviation;
µg/L, microgram per liter; —, no data]
| | | | Low concentrations | High concentrations | | | Mean concentration replicate sets |
|---|
| Analytes | Consistent detections | Consistent detections minus whole values | Range (µg/L or pCi/L) | Number of replicate sets | Mean SD (µg/L or pCi/L) | Range (µg/L or pCi/L) | Number of replicate sets | Mean RSD (percent) | Mean SD all ranges (µg/L or pCi/L) | Mean RSD all ranges (percent) | Minimum (µg/L or pCi/L) | Median (µg/L or pCi/L) | Maximum (µg/L or pCi/L) |
|---|
| Aluminum | 147 | 123 | — | — | — | — | — | — | 0.98 | 11.8 | 1.09 | 3.93 | 467 |
| Antimony | 41 | 41 | — | — | — | — | — | — | 0.01 | 9.42 | 0.03 | 0.06 | 0.75 |
| Arsenic | 202 | 125 | — | — | — | — | — | — | 0.33 | 7.62 | 0.16 | 1.92 | 108 |
| Barium | 272 | 240 | — | — | — | — | — | — | 1.54 | 2.02 | 1.13 | 51.7 | 20,300 |
| Beryllium | 7 | 7 | — | — | — | — | — | — | 0.06 | 6.23 | 0.05 | 0.12 | 7.71 |
| Boron | 128 | 124 | 4.5–72.8 | 87 | 1.79 | 72.8–1,780 | 37 | 3.50 | 6.21 | 5.86 | 4.58 | 38.4 | 1,780 |
| Cadmium | 28 | 28 | — | — | — | — | — | — | 0.15 | 13.1 | 0.02 | 0.08 | 4.18 |
| Chromium | 149 | 120 | 0.51–2.39 | 63 | 0.19 | 2.39–30.2 | 57 | 9.60 | 0.36 | 11.5 | 0.51 | 2.37 | 30.2 |
| Cobalt | 85 | 84 | 0.01–1.63 | 70 | 0.01 | 1.63–71.2 | 14 | 5.96 | 0.44 | 7.37 | 0.01 | 0.20 | 71.2 |
| Copper | 149 | 138 | — | — | — | — | — | — | 0.69 | 10.3 | 0.15 | 1.96 | 403 |
| Iron | 302 | 116 | 3.64–61.7 | 55 | 2.75 | 61.7–6,830 | 61 | 2.62 | 15.8 | 8.97 | 3.64 | 88.9 | 6,830 |
| Lead | 55 | 48 | — | — | — | — | — | — | 0.23 | 12.5 | 0.04 | 0.39 | 9.12 |
| Lithium | 99 | 99 | — | — | — | — | — | — | 1.24 | 7.06 | 0.35 | 3.88 | 164 |
| manganese | 453 | 229 | — | — | — | — | — | — | 3. | 3.28 | 0.15 | 36.8 | 28,300 |
| molybdenum | 206 | 152 | — | — | — | — | — | — | 0.14 | 3.51 | 0.16 | 2.84 | 188 |
| Nickel | 157 | 131 | 0.03–1.20 | 36 | 0.08 | 1.20–52.3 | 95 | 9.01 | 0.26 | 11.2 | 0.03 | 1.96 | 52.3 |
| Radon (pCi/L) | 336 | 336 | 44.5–697 | 240 | 19.9 | 697–211,000 | 96 | 4.13 | 49.0 | 5.85 | 44.5 | 435 | 211,000 |
| Selenium | 112 | 89 | — | — | — | — | — | — | 0.40 | 10.3 | 0.26 | 1.90 | 41.1 |
| Silver | 0 | 0 | — | — | — | — | — | — | — | — | — | — | — |
| Strontium | 143 | 134 | — | — | — | — | — | — | 41.7 | 2.35 | 15.4 | 243 | 6,910 |
| Thallium | 8 | 8 | — | — | — | — | — | — | 0.01 | 18.3 | 0.03 | 0.08 | 0.13 |
| Uranium | 198 | 155 | 0.01–13.3 | 128 | 0.07 | 13.3–97.1 | 27 | 0.98 | 0.11 | 2.46 | 0.01 | 2.60 | 97.1 |
| Vanadium | 64 | 64 | 0.12–1.77 | 23 | 0.16 | 1.77–171 | 41 | 10.9 | 1.17 | 15.2 | 0.12 | 2.35 | 171 |
| Zinc | 180 | 156 | — | — | — | — | — | — | 2.78 | 11.8 | 1.03 | 7.25 | 5,190 |