SURROGATE DETECTION FOR CONTINUOUS EMISSION MONITORING BY RESONANCE IONIZATION

New measurements of resonance ionization detection limits are presente d for seven species, of high thermal stability, which are potentially useful surrogates for continuous emission monitoring of incinerator ef fluent. Resonance ionization detection limit data are now available fo r 20 aliphatic and aromatic compounds; eight of these compounds have s ub part-per-billion detection limits. These eight also exhibit selecti vities exceeding 10(3) when detected in the presence of a ''soup'' of chemically similar interferant species likely to be present in stack g as samples. Preliminary measurements indicate that detection limits, o btained under ideal conditions in a helium carrier gas, are also appro ached under adverse sampling conditions tested with synthetic ''soups' '. The implications of these measurements on the selection of surrogat es and the prospects for repetitive on-line hazardous emissions monito ring are discussed