FEASIBILITY OF A NEW DIFFUSIVE SAMPLER TO MEASURE SUB-PPB LEVELS OF VOCs

Background

Diffusive Samplers: A Possible Alternative to Canisters

Diffusive Samplers: Widely studied for ppm levels

Diffusive Samplers: New studies for sub-ppm levels

Diffusive Samplers: Indoor and Ambient Air Studies

Ultra Badge

Sorbent Storage and Transfer from Badge

NEXT DEVELOPMENT:
ULTRA II SAMPLER

ULTRA II DESIGN MODIFICATIONS

Front and Back of Sampler

Filling the Sampler

Emptying the Sampler

Ultra II Diffusive Sampler

Slide 15

Sampling Accessories: Vial Containing the Sorbent

Sampling Accessories: Sampling Stand

Evaluation of the Ultra II Sampler

VOCs Evaluated

Sample Media Selection

Analytical Conditions

Performance Criteria

Sampling Rates and MRL for VOCs

Sampling Rates and MRL for VOCs

Storage of TCE and PCE
 on Tenax TA in Tubes, - 3 C
(%Recovery ±RSD)

Storage of TCE and PCE
on Anasorb GCB1 in Tubes, - 3 C
 (%Recovery ±RSD)

Storage of TCE and PCE
Tenax TA in Vials, - 3 C
 (%Recovery ±RSD)

Storage of TCE and PCE
 on Anasorb GCB1 in Vials, - 3 C
 (%Recovery ±RSD)

Audit Accuracies on Tenax TA
Trichloroethylene

Audit Accuracies on Tenax TA
Perchloroethylene

Audit Accuracies on Anasorb GCB1
Trichloroethylene

Audit Accuracies on Anasorb GCB1
Perchloroethylene

Audit Accuracies on
Chromosorb 106
Trichloroethylene

Audit Accuracies with Tenax TA
Other VOCs

Audit Accuracies with
Anasorb GCB1
Other VOCs

Duplicate Precision Data
Chlorinated Compounds Sampled on the Ultra II

Field Studies

Conclusions - Diffusive samplers provide logistical advantages.

Conclusions - Diffusive sampler design
can be optimized for sub-ppb analysis.

Conclusions