Organics WG POM: (umol / kg) Best PC and PN : High Temp Combustion via Elemental Analyzer POP: Ash Hydrolysis Collection: Volume filtered is site dependent.

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Presentation transcript:

Organics WG POM: (umol / kg) Best PC and PN : High Temp Combustion via Elemental Analyzer POP: Ash Hydrolysis Collection: Volume filtered is site dependent Best: separate bottle dispensed into carboy that can be mixed and sampled to avoid bias against rapidly sinking particles. Good: subsample bottle – esp in oligotrophic systems Some sites- prescreen through 200 µm mesh Filtration: pay attention to filtration rate and avoid overloading filter. Best- low vacuum (5 in Hg), positive pressure filtration

POM: PC&PN Sample prep: when drying sample be careful of oven temperature as drying at 70° C can result in N loss For Carbon: Best: run total C and PIC directly to assess POC Good: acidify (fume) to rid sample of PIC - Validate Intercalibration: Best: collect and prepare “in house” references from local system Run in every run multiple time in a run Swap with other TS for intercalibration Good: use other references like apple leaf for recovery checks

DOM (umol /kg): DOC: Best: High Temperature Combustion (black art) Good: Persulfate Oxidation Acceptable: UV oxidation TDN: Best: High Temperature Combustion –Gives TDN must subtract out DIN. Problems when NO3 is too high due to propagation of error Good: Persulfate Oxidation Acceptable: UV oxidation DOP: Best Persulfate Oxidation Good/ acceptable: UV oxidation - problem with Si interference

DOM: Filtering is recommended in coastal systems with high POC load. Oligotrophic systems POM load is small and TOM may be appropriate. Collection: Minimize handling Best- when filtering best to be conducted directly off Niskin through combusted GF/F in PC cartridge using silicone tubing…no Tygon! Combusted Glass or acid leached HDPE bottle Freeze at -20 up right or acidify to pH 3 and refrigerate good- subsample and filter in lab. Take special care to minimize contamination!!

Intercalibration & Consistency between Sites: There is no certified reference material but Hansell Consensus ref Material are available. Best/ must: Make 2 – 3 large volume (8 – 10 L) in house References that are calibrated against the Hansell Consensus Material. These in house references along with blank water should be run every samples to assess performance of the analytical run. References should not vary by more than 2 – 3 % over the course of an acceptable run When introducing new “in house” references- analysts need to overlap reference batches. These references can be swapped among TS for intercalibration of analysis.