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Staff Contact: Doug Turner (650-678-6454)
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General: The TOC is available to all members of the Stanford community. This is a user run instrument. Before signing up, users must complete a training session on the instrument and be certified by a facility technician. Once certified, users planning to run samples must sign up on the TOC Scheduler. In addition, all users must fill out the user log book each time the machine is operated or modified. The TOC Start-Up Checklist and user log book are kept on the shelf above the instrument. Operators must be certain that they are using the proper personal protection gear prior to beginning work. Users must wear safety glasses while operating this instrument except when they are seated and using the computer.
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Operation: The TOC is available for use by certified users Monday through Friday, 8am to 5pm.
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Cost: The TOC costs $10 per hour. Instrument setup, sample analysis and data finalization will all be billed at this rate. Users must have a valid Stanford PTA to sign up for this instrument.
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Samples: All samples for analysis must be in aqueous form. Unknown samples must be free of solid particulates. Filtered samples need to be poured into the dedicated TOC glass vials provided by the facility. Solids in the samples can cause inaccurate readings and clog the injection line, resulting in longer running time, expensive repairs, replacements, and down time on TOC which we would like to avoid. SAMPLES WITH ADDED MERCURY CAN NOT BE RUN ON THIS INSTRUMENT.
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Standard Solutions: The lab provides standard stock solutions for TC/TOC and TN analysis, as well as volumetric flasks dedicated to various concentrations. Sodium hydrogen carbonate and sodium carbonate are also available for preparation of IC standard solutions. Users are expected to make their own standards prior to using the instrument, unless relevant, recently made standards are already available.
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