pHDetect Module0 pages

pHDetect TM Module
Option for the Eclipse
Purge-and-Trap Sample Concentrator
• Automatically measures and electronically logs

a pH measurement for every water sample
immediately after the purge step

• Performs an automatic two-point calibration at

programmable intervals

• Logs all calibrations and sample pH measurements

with a date and time stamp

• Reports data from a PC using Eclipse Reporter or

export data for use with a spreadsheet, LAN, or
LIMS

• Saves money by eliminating the collection of extra

samples for pH measurement and the labor and
materials to measure the pH manually

Product Description
Applications
• Volatile organics
analysis by GC and
GC/MS
• Drinking water
• Wastewater
• Groundwater
• Storm water
• Volatile Petroleum
Hydrocarbons (VPH)
• Oxygenates

Methods
• USEPA 502.1, 502.2,
503.1, 524.2, 601, 602,
603, 604, 624, 1666,
5030, 8010, 8015, 8020,
8021, 8030, 8260
• ASTM and Standard
Methods
• VPH and GRO Methods

* Patent Pending

The pHDetect* is an optional, external module for the Eclipse 4660 Purge-and-Trap (P&T)
Sample Concentrator that automates measurement and recording of pH values for Volatile
Organic Compound (VOC) water samples.
Many USEPA methods for VOCs require sample preservation with acid to a pH <2, and other
methods allow optional preservation techniques to pH >11. When following these methods,
replicate samples must be collected in the field solely for measuring the pH. Without the
pHDetect, the analyst opens the extra sample vial, measures the pH manually, and records
the measurement in a log, a time-consuming and labor-intensive procedure. Alternatively, the
bench chemist manually checks every vial’s pH after the purge-and-trap analysis is complete.
The pHDetect eliminates the need for collecting additional samples, as well as the labor and
materials associated with manual pH measurement.

Operating Principle
As the water sample drains from the Eclipse sparge vessel, it is collected in a glass reservoir
on the front panel of the pHDetect where a precise pH electrode takes the pH reading. The
pH reading is logged with a date and time stamp in the Eclipse database, and the sample
drains from the reservoir. The Eclipse then prepares the sample pathway for the next sample
by purging with gas and flushing with autosampler rinse water during the normal Eclipse
rinse cycle. Calibration of the pH electrode is done at user-programmable intervals and is
fully automated using the two on-board buffer solutions. All calibrations and sample pH
measurements are logged in the Eclipse database with a date and time stamp and can be
accessed from a networked PC for
reporting using the Eclipse Reporter
or for exporting to use with a
spreadsheet, LAN, or LIMS.
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