Photoionization fast-conductivity technique for analysis of traffic contaminated soils

Vladimir V. Gridin, Valery Bulatov, Alona Korol, Israel Schechter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A time-resolved detection of the multiphoton ionization induced photocurrents was developed and applied to map a near-field contamination profile of a year-around-active traffic road. Main advantages of the proposed method are in its simplicity and rapidity. No chemical sample preparation is required: analysis is carried out in ambient conditions and the technique can be easily automated. A fast screening of contaminated soils is feasible. The soil samples collected at various radial distances, R, have produced, as method's readout, the photoionization charges, Q. These originate from combustion by-products and were found to decrease according to 1/Q ∼ R. This finding is supported by a straightforward contamination model that largely avoids an obvious complexity associated with the precise mathematical treatment of such a pollution source. We estimate that at R=50 m the concentration of organic contamination is as high as 0.1μg/g.

Original languageEnglish
Pages (from-to)321-333
Number of pages13
JournalInstrumentation Science and Technology
Issue number4
StatePublished - 1997
Externally publishedYes


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