Environmental Measurements Facility

DA User Info

  1. Staff Contact:  Taylor Broek (415) 847-4258
  2. General: The Thermo Gallery Aqua Master discrete analyzer 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 DA Scheduler. In addition, all users must fill out the log book each time the machine is operated.
  3. Operation:  The discrete analyzer is available for use Monday - Friday, 8am to 5pm.  Experienced users can make arrangements to use the instrument during off hours.
  4. Cost: The discrete analyzer costs $1 per sample per analyte. The user is responsible for accurately reporting sample numbers in the log book. Users must have a valid Stanford PTA to sign up for this instrument.
  5. Samples: All samples for analysis must be in aqueous form. Samples must be filtered and free of solid particulates. Water samples should be filtered with a 0.45mm or smaller membrane filters, while 2N potassium chloride extractions should pass through Whatman #1 filter paper.  Filtered samples need to be poured into plastic cups provided by the facility and placed in the sample rack. Solids in the samples can cause inaccurate readings and clog the sample probe, resulting in expensive repairs, replacements, and down time for discrete analyzer.
  6. Standard Solutions: The lab provides standard solutions of nitrate, nitrite, ammonium and phosphorus.
  7. Rate of Analysis:
  8. Method Detection Limits and ranges: