Study On The Determination Method Of PCNs Emission From Solid Waste Incineration By HRGC-HRMS

Polychlorinated Naphthalenes are highly toxic, persistent, lipid solubility, low volatility,and bioaccumulation. They are chemically very stable and resistant to environmentaldegradation, and have longer half-life. They will do harm to the human healthy through theenrichment of food chain. Therefore researching on Polychlorinated Naphthalenes pollutionand its analytical detection methods have become an increasing international concern. PCNshave been recommended for inclusion in the Stockholm Convention on Persistent OrganicPollutantsby part of the NGOs. Municipal solid waste incineration is one of the majorpollution sources generated PCNs congeners. Therefore, detecting on the stack gas emissionfrom the pollutant sources can assess its impact on the level of environmental pollution aswell as the target population exposure levels. Therefore, the establishment of detectionmethods of PCNs in the stack gas is necessary.There is no standard monitoring methods about PCNs at home and abroad so far. Basedon the research methods at home and abroad, the subject were stack gas emission from theMSWI, selected the isotope internal standard, the preparation of standard curve, evaluation onthe sampling blank, lab blank, sampling recoveries, extraction recoveries of internal standard,precision and accuracy, this thesis established the determination method of PCNs emissionfrom municipal solid waste incineration by HRGC-HRMS. As follows:This study identified17kinds of PCNs target monomer first, and screened indicativeisotope internal standard (ECN5260as the sampling internal standard, ECN5102as theextraction and purification internal standard, taking EPA1668A-IS as the injection internalstandard), then configured the CS1~CS6standard curve series, the range of linearconcentration is0.1-200pg/μL. By optimizing the parameters of gas chromatography andmass spectrometry, established the instrumental analysis methods of PCNs. All of the17kinds of PCN monomer identified by this research could be separated on baseline exceptPCN-28/36and PCN-66/67. Interference experiments of the PCNs have been made also,results shows that there were no interfere with the measurement of PCNs by the PCBs andCBs.The RSD of the relative response factor of the monomers in standard curve range is4.4%-15.6%, checking the daily performance of the standard curve for different periods ofeach solution PCNs monomer relative response factors and the standard deviation of theresponse curve factor statistical results are within15%range. The instrument detection limitsis0.05~0.25pg/μLwhile the linear quantitation range is0.5-200pg/μL.For the actual samples, sample recoveries of internal standard13C-PCN-64is between77.9%-81.1%, the extraction internal standard recovery range is40.7%~86.4%, and therelative standard deviation range is5.23%-14.01%. The PCNs detection method range is0.003-0.009ng/Nm3(the sample size is2Nm3). The recovery rangeof target compounds in the spiked blank experiments is84.6%-116.2%.These results indicate that, due to the choice limits of PCNs standard substance currently,we can’t evaluate the loss of lower chlorinated congeners PCNs in real time, so there aresome methodological flaws. However, the method established in this study with highsensitivity, simple, selective, accurate, reproducible, and suitable for the determination of fluegas sampled from pollution sources PCNs compounds.