Some notes for sampling:
- One flask per sample is sufficient, minimum volume is 10 mL.
- Do not treat samples! No filtration, no additives, no freezing.
- Use powder-free gloves for sampling, if possible.
- On the day of sampling please do not use perfumes, hair conditioners, creams, etc.
- During sampling try not to speak, sneeze or cough.
- If possible, label the flasks with self-adhesive labels before sampling. If you do not know the precise sampling sites, mark flasks in consecutive order
and note sampling sites separately. WHY?: Felt pens release organic solvents!
- Before you sample, think about where to put the closure that it will not be contaminated! At site, rinse flasks 2x with sample, then sample and close.
Leave some air space in the flask. If your sample contains reduced ground waters: Precipitation of iron can be prevented by filling flasks ”bottom-up” with a tube, prevent air space.
- For “hot” waste waters (before treatment) and in case of slow shipment of samples at warm seasons we recommend to pasteurize closed flasks before shipment.
Pasteurize samples in a water bath for 15-13 min at 65-80 °C. At site you may use a tea-kettle: Boil 1L of water, and let it cool for 10 min and insert sample flasks (10-50 mL).
Wait about 1 hr. For larger flasks you have to reheat the kettle occasionally. Make sure labels do not come off and are still readable.
- Sampling volumes
These are the volumes we need at least per sample analysis:
Standard Marine Ultrapure Sum. DOC Volume 10 mL 50 mL 1000 mL 10 mL
- Find further information within our downloadable instructions: Sampling and Shipping
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