Particulate Organic Carbon Supplement In Reply Refer To: Mail Stop 412 May 22, 2000 Office of Water Quality Technical Memorandum 2000.07 Subject: Particulate Organic Carbon Supplement Office of Water Quality (OWQ) Technical Memorandum 2000.05 released on April 28, 2000, introduced the new lab and field methods for particulate carbon and gave a list of materials that will be needed with these new methods. After field trials, we can now recommend an additional filtering apparatus that is suitable to use with these methods in addition to the Teflon DOC-25 filtration apparatus specified in the previous memo. The filtering apparatus designated in this memo is a vacuum flask and a filter funnel similar to those often used for other small volume filtering operations. Either filtering apparatus will produce good results for particulate organic carbon samples and the costs are roughly the same. The parts recommended for the vacuum filtration procedure are: · Polypropylene filtering flask (VWR # 29417 or equivalent) · 25-mm polysulfone filter funnel w/200 ml reservoir (VWR # 28144-754 or equivalent) · Nalgene hand vacuum pump (VWR # 54903 or equivalent) This vacuum filtration apparatus is not usable if you choose to capture the filtrate for a DOC sample. If you want to use the filtrate that passes trough the glass fiber filters DOC analysis, DOC-25 must be used. Janice R. Ward /s/ Acting Chief, Office of Water Quality This memorandum is a supplement to the OWQ Technical Memorandum 2000.05. Distribution: All WRD Employees