The Dräger-Tube method of measurement is used…. 

More than 500 substances can be detected and measured using the Dräger-Tube system. Typical applications include the monitoring of workplace air, emission measurements, quality control, process control and monitoring of compressed air for breathing apparatus, as well as environmental and hazardous substance detection technology.

Dräger-Tubes can be used in combination with the Dräger Air/Liquid Extraction Method for quick and low-cost investigations of sewage, oil sludge and multi-phase samples to check for possible contamination by organic solvents, for example.

…for investigating soil pollution.

Dräger-Tubes in combination with a soil air probe can be used to detect and assess contaminants in the soil, for example on waste disposal sites and industrial waste sites.