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 2
Haloacetic acid and surrogate concentrations in the stock standard solution and the three working standard solutions C, B, and A that are prepared in methyl-tert-butyl ether.
[Certificate of analysis accompanying stock standard solution lists actual concentration of haloacetic acid compounds to four significant figures. Because the actual concentrations vary slightly between lots, nominal concentrations in micrograms per milliliter are listed here instead. —, stock standard solution does not contain the surrogate compound]
| Analyte | Stock standard solution (μg/mL) | Working standard solution C (μg/mL) | Working standard solution B (μg/mL) | Working standard solution A (μg/mL) |
|---|
| Bromochloroacetic acid | 400 | 200 | 20 | 2 |
|---|
| Bromodichloroacetic acid | 400 | 200 | 20 | 2 |
|---|
| Dibromochloroacetic acid | 1000 | 500 | 50 | 5 |
|---|
| Dibromoacetic acid | 200 | 100 | 10 | 1 |
|---|
| Dichloroacetic acid | 600 | 300 | 30 | 3 |
|---|
| Monobromoacetic acid | 400 | 200 | 20 | 2 |
|---|
| Monochloroacetic acid | 600 | 300 | 30 | 3 |
|---|
| Tribromoacetic acid | 2000 | 1000 | 100 | 10 |
|---|
| Trichloroacetic acid | 200 | 100 | 10 | 1 |
|---|
| 2-bromopropionic acid (surrogate) | — | 500 | 50 | 5 |
|---|