: Extract Chlorophyll1. Remove all Chl samples from liquid nitrogen (keep in foil)2. Arrange Chl samples in chronological order by date and sample ID 3. Record sample date and sample ID on data sheet4. Assign each sample a number (1,2,3…)5. Turn off lights6. Label a 15 mL centrifuge tube with the first sample number (1) 7. Remove Chl filter from foil using forceps and push it to the bottom of the centrifuge tube8. Add 7 mL of 90% acetone and capa. 7 mL usually works well for offshore samples with 25 mm GF/F filters. Sometimes the extraction volume is increased: larger filters, estuarine samples, bloom conditions.9. Vortex. Make sure Chl filter is submerged.10. Place tube in a dark drawer11. Repeat this process for all samples, being sure to accurately label each tube12. Keep samples in the freezer for 24 hours to allow for complete Chl extraction
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