WASTEWATER: PHYSICAL-CHEMICAL /REF. 990004/
In the following tables you can see the dates on which the rounds take place:
| ROUND 1 | ROUND 2 | ROUND 3 |
|---|---|---|
| WEEK 6 2nd February 2026 |
WEEK 22 25th May 2026 |
WEEK 41 5th October 2026 |
| Aluminium | Antimony | Arsenic |
| Ammonium | Anionic surfactants | Biological oxygen demand (BO5D) |
| Biological oxygen demand (BO5D) | Biological oxygen demand (BO5D) | Boron |
| Chemical oxygen demand (COD) | Cadmium | Chemical oxygen demand (COD) |
| Chlorides | Chemical oxygen demand (COD) | Conductivity at 20ºC (new) |
| Chromium | Chromium VI | Conductivity at 25°C |
| Copper | Cobalt | Iron |
| Fluorides | Manganese | Kjeldahl nitrogen |
| Nickel | Orthophosphates | Lead |
| Nitrates | Suspended solids | pH |
| Selenium | Total phosphorus | Suspended solids |
| Suspended solids | Total organic carbon (TOC) | Thallium |
| Toxicity | Zinc | Tin |
| Total nitrogen |
You will find detailed information in our Proficiency Testing Scheme Catalogue. [Download Catalogue]
You can find the guideline ranges of concentration here.
For any further information, please contact ielab at: comercial@ielab.es.
