d_pretreatment_dp
| CODE | DESCRIPTION | FROM_YEAR | TO_YEAR |
|---|---|---|---|
| 0.00 | No information | 1984 | |
| 1.00 | No pretreatment | 1984 | |
| 8.20 | Hydrolysis with K2S2O8 + H3BO3 + NaOH | 1984 | |
| 8.30 | Persulfate digestion (K2S2O8 + H2SO4) | 1984 | |
| 8.40 | Persulfate digestion (K2S2O8 + NaOH) | 1984 | |
| 8.70 | Other deposition pretreatment (please specify per email) | 1984 |