基于关联模型的二恶英在线检测研究

Study on on-line detection of dioxins based on correlation model

为实现二恶英快速检测,指导废物焚烧炉二恶英减排,通过检测生活垃圾焚烧炉烟气中氯苯和二恶英浓度,研究了三氯苯、四氯苯和二恶英之间的关联关系,并利用实验室自行研制的飞行时间质谱仪对烟气样品的三氯苯进行在线检测。结果表明,三氯苯与二恶英毒性当量(I-TEQ)之间存在良好关联性,相关系数(R2)可达到0.89。仪器检测信号强度与三氯苯浓度之间具有良好的线性关系,根据在线检测烟气样品中三氯苯的信号可得到三氯苯浓度,并根据关联模型计算得到二恶英毒性当量值I-TEQ,实现了对烟气样品中二恶英的快速间接测量。

In order to monitor dioxins concentration rapidly,and guide incinerator operation to reduce dioxins emission,chlorobenzene and dioxins in flue gas of municipal solid waste incinerator( MSWI) were measured. The correlation between trichlorobenzene( TrCBz),tetrachlorobenzene( TeCBz) and dioxins was analyzed,and time-of-flight mass spectrometer(TOFMS) was used to online detect TrCBz in flue gas. The correlation coefficient(R2) was over 0.89 between TrCBz and toxic equivalent(I-TEQ). A good linear relationship existed between signal strength and trichlorobenzene concentrations,and I-TEQ value of flue gas samples can be calculated by signal strength according to the relationship and correlation between I-TEQ and TrCBz. Finally,the rapid indirect measurement in online detection of dioxins in the flue gas sample was achieved.