ADVANCED MEASUREMENT OF ELEMENTAL CONTENT OF AIRBORNE PARTICULATE MATTER ON A CONTINUOUS BASIS

摘要

Several tests were conducted at an industrial waste incinerator facility in July 2002 for a novel continuous emission measurement instrument developed by the Oak Ridge National Laboratory(ORNL).Stock solutions of known metal concentration(s)were nebulized to provide spikes for the instrument testing.Strengths of the solutions were designed such that a reference method(RM)was able to take sufficient material on filter samples that were subsequently analyzed in a laboratory to produce 30-minute average data points.Parallel aerosol measurements were performed by using the ORNL instrument through which pulsed laser-induced plasma was used as the excitation energy source for the measurements.Recorded signal of an individual element was converted into mass concentration calculated from a calibration curve established prior to the campaign.RM was able to reflect the simulated loads in the spiked waste stream;however,it was unable to detect the process variation within a 30-min time interval.RM also missed one beryllium sample.The possibility of bias in the RM determination also exists.With the real-time detection capability,the ORNL instrument was able to reveal the emission variation by making seven measurements within a 30-min cycle.