Method of Analysis at the U.S. Geological Survey California Water Science Center, Sacramento Laboratory – Determination of Haloacetic Acid Formation Potential, Method Validation, and Quality-Control Practices
Barbara C. Zazzi, Kathryn L. Crepeau, Miranda S. Fram and Brian A. Bergamaschi
Table 9
The percent recovery for nine haloacetic acids in replicate samples of quality-control standards.
[n, number of replicate samples; µg/L, micrograms per liter]
| | Quality-control Sample 5 (n=16) | Quality-control Sample 50 (n=15) |
|---|
| Analyte name | Concentration (µg/L) | Mean percent recovery | Standard deviation (percent) | Concentration (µg/L) | Mean percent recovery | Standard deviation (percent) |
|---|
| Bromochloroacetic acid | 5.0 | 84 | 8.2 | 50 | 80 | 7.6 |
|---|
| Bromodichloroacetic acid | 5.0 | 75 | 17 | 50 | 84 | 13 |
|---|
| Dibromochloroacetic acid | 5.0 | 114 | 27 | 50 | 122 | 19 |
|---|
| Dibromoacetic acid | 5.0 | 109 | 16 | 50 | 116 | 27 |
|---|
| Dichloroacetic acid | 5.0 | 108 | 12 | 50 | 97 | 8.6 |
|---|
| Monobromoacetic acid | 5.0 | 105 | 21 | 50 | 102 | 8 |
|---|
| Monochloroacetic acid | 5.0 | 104 | 15 | 50 | 103 | 23 |
|---|
| Tribromoacetic acid | 5.0 | 118 | 44 | 50 | 118 | 27 |
|---|
| Trichloroacetic acid | 5.0 | 111 | 16 | 50 | 110 | 18 |
|---|