Analyses and methods
The analyses below are run at DIG’s Westminster, Colorado laboratory. “In A2LA scope” means the analyte and method appear on our current scope of accreditation for nonpotable water.
Water chemistry
| Group | Analytes | Method | In A2LA scope |
|---|---|---|---|
| General chemistry | pH, TDS, TSS, alkalinity (total, bicarbonate, and carbonate) | SM 4500-H+ B, SM 2540C, SM 2320B | Yes |
| Metals and cations | Calcium, magnesium, potassium, sodium, barium, boron, iron, lithium, manganese, selenium, strontium | EPA SW-846 6010D | Yes |
| Anions | Chloride, sulfate, bromide, fluoride, nitrate, nitrite, phosphate | EPA SW-846 9056A | Yes |
| Organics | BTEX, GRO, DRO | EPA SW-846 8015C | Yes |
| Dissolved gases | Methane, ethane, propane | RSK-175 (Henry’s Law) | No |
| Bacteria | Iron related, sulfate reducing, slime forming. Available upon request; may increase standard and rush turnaround times. | BART (Biological Activity Reaction Test), run in-house | No |
Gas composition and stable isotopes
| Analysis | Analytes | In A2LA scope |
|---|---|---|
| Gas composition | N₂, O₂+Ar, CO₂, He, H₂, C1–C5, C6+ | No |
| Carbon isotopes | δ¹³C of methane, ethane, propane–pentane, CO₂ | No |
| Hydrogen isotopes | δ²H of methane and ethane | No |
| Water isotopes | δ²H and δ¹⁸O of water | No |
| Dissolved inorganic carbon | δ¹³C of DIC | No |
Not currently offered
Soil analysis, drinking water analysis, VOCs, SVOCs
Sampling
Pre-preserved water kits with instructions and a chain-of-custody form are available on request. Request kits · Download chain of custody
