Enviro columns from Bischoff are special columns for environmental analysis. They are specially modified to meet the requirements of specific methods.
Enviro PHE are special columns to analyze phenols in environmental samples. They are designed for the requirements of EPA method 604/625.
Enviro PES is a special material for the analysis of pesticides in environmental samples. They are designed to meet the requirements of DIN 38407 F12.
Enviro PTL columns are made for group determinations of non-aromatic, mono-aromatic, di-aromatic and poly-aromatic hydrocarbons in the petroleum industry. This phase is designed to fulfill the requirements of the European standard prEN 12916 (June 1997).
| Phase | Modification | Particle size / µm | Pore size / Å |
| Enviro EXP | C18 | 6 | 100 |
| Enviro PHE | C18 | 7 | 100 |
| ProntoSil Enviro PHE | C18 | 3 | 120 |
| Enviro PES | C18 | 5 | 100 |
| Enviro PAH | C18 | 6 | 100 |
| ProntoSil Enviro PTL | N/A | 5 | 60 |