VOC Sampling

with the waterra inertial pump and VOC sampling kit

It is a frequent requirement of groundwater monitoring programs to sample for the presence of volatile organic compounds (VOC) in groundwater. This can be a complicated procedure because these compounds are by definition volatile, and through the sampling process these compounds may escape from the water. Depending on the volatility of the compound and the sampling technique, the concentrations in the sample may be severely reduced. This could lead to inappropriate conclusions and recommendations based on the poor quality samples.

The challenge is to inexpensively collect samples without losing the VOCs.

suggested solution

Waterra has developed an effective and efficient means of collecting VOC samples using the Waterra Inertial Pumping System and a VOC Sampling Kit. This system has been used in countless groundwater sampling programs through the years and independent studies have shown validity of the data collected by these means.

procedure

The essence of the system is to complete the applicable pre-sampling protocol whether it be the classic "purge three well volumes" or, "pump until stability of well water parameters is achieved" or other protocol using the Waterra Inertial Pumping System. When ready to collect the VOC sample, continue pumping but insert the VOC sampling tube up into the Waterra Tubing. In effect, the VOC tube allows one to siphon off a sample from within the continuous vertical water column and direct the resulting laminar flow into the VOC sample vial.

suggested solution

Waterra is aware that some groundwater investigators collect VOC samples using bailers. Waterra premium quality Disposable Bailers are inexpensive and suffer no disadvantage relative to other bailers on the market.