The Relationship Between The Standard Deviation The Concentration of Single- Simultaneous Multiple Train Dioxin Furan Data

摘要

The variance of polychlorinated dibenzo-p-dioxin (PCDD; dioxin) and polychlorinated dibenzofuran (PCDF; furan) data obtained from single and simultaneous multiple train methods was compared. Precision of stack sampling data can be the difference between meeting and failing compliance limits. Generally, three dioxin/furan samples are acquired when stack sampling to meet compliance regulations. A reliable estimation of the data's true concentration is not possible with this small amount of data. Increasing the precision decreases the chance that the acquired concentration deviates greatly from the true concentration. Single train triplicate data were used from 4 stack tests obtained from a long dry kiln cement plant and 18 stack tests from a municipal solid waste (MSW) incinerator. Data from the American Society of Mechanical Engineers (ASME) report Reference Method Accuracy and Precision (ReMAP) - were used for the simultaneous multiple samples, which accounted for 27 data points. 19 data points were acquired from an ASME research facility, 5 from a MSW incinerator unrelated to the single train MSW incinerator, and 3 from a lightweight aggregate kiln (LWAK). The relationship between the standard deviation and the concentration of the single train and simultaneous multiple train data was determined. Results indicated that there was benefit from the use of simultaneous multiple train sampling for concentrations above 129 pg toxic equivalency (TEQ)/m~3. There was no indication of benefit from the use of simultaneous multiple train sampling at concentrations below 129 pg TEQ/m~3.