A Comparison of PID Technologies Designed to Combat Humidity Issues in Headspace Analysis of Soils
Geoff F Hewitt, ION Science (Americas), Waterbury, VT

A Comparison of PID Technologies Designed to Combat Humidity Issues in Headspace Analysis of Soils

Geoff F Hewitt, ION Science (Americas), 35 Crossroad, Waterbury, VT 05676, Tel: 802-244-5153, Fax: 802-244-8942, Email: geoff.hewitt@ionscience-americas.com 

The Maine DEP routinely requires certification of PIDs used for certain headspace screening activities within the state UST program. They believe that substantial savings can accrue from soil screening provided adequate precautions are taken to ensure results are meaningful. To that end, Maine DEP has identified differences in results from various makes of PIDs and developed a procedure backed by lab analysis to normalize response.

The procedure developed to determine these Maine Set Points is presented together with the set points themselves and an explanation is offered as to why PID responses vary so widely.

The Maine data allows the user to draw conclusions about the value of two differing technologies in addressing humidity issues for headspace analysis of soils.

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