"Development of analytical method for PCN project (2/2)"2018
「"Development of analytical method for PCN project (2/2)"2018」於資料集「EPQSummary_EnvironmentalMonitoringAndTesting」由單位「行政院環境保護署」的陳先生所提供，聯繫電話是02-2311-7722#2386，最近更新時間為：2023-07-30 01:01:45。 欄位Project Title的內容是"Development of analytical method for PCN project (2/2)" ， 欄位Project Subject的內容是"The project for developing the method for the analysis of polychlorinated naphthalene (PCNs) in fly ash has been completed. The tests of pretreatments and instrument parameters have been carried out. The pretreatment tests were devided into extraction and clean-up process. The results of clean-up tests indicate that the effects of adsorbents on PCNs separation are significant and depend on the adsorption capability of adsorbent. Non-polar adsorbent such as activated carbon with a high specific area has the advantage of high adsorption capacity and can separate high boiling point interferences from analyzte, however, it has the disadvantages of being costly and time-comsuming. Additionally, in the test of the polar adsorbents, Aluminum exhibits a higher adsorption ability than Florisil. For the extraction test, dichloromethane (DCM), hexane/acetone (1:1, v/v) and toluene have been selected as solvents. The results show that DCM has a high extraction efficiency for Mono-CN to Tri-CN while higher extraction efficeiencies can be achieved for Tetra-CN to Octa-CN as toluene is applied as solvent. Besides, toluene also can effectively extract aromatic compounds from the high-carbon matrix such as flyash and sediment. Thus, toluene is selected to extract samples in this study. The Quality Assurance and Quality Control (QAQC) have also been conducted. The method detection limit has been evaluated repeatedly with 0.1 ng/mL PCN following the methods of NIEA-PA107. Furthermore, the results of the precision test indicate that the recovery efficiencies PCNs analyte and internal standard are within the range of 99.4%-106% and 51%-90.7%, respectively. The control standards of PCN recovery efficiency for NIEA are suggested according to the results. Comparison of PCNs analysis between High Resolution Gas Chromatography/High Resolution Mass Spectrometry (HRGC/HRMS) with 60 m column and Gas Chromatography/Tandem Mass Spectrometry (GC-MS/MS with 40 m) column has been made. The results point out that the properties of column are the critical to affect the separation efficiency of PCNs compounds. From Mono-CN to Tri-CN pattens, MonoCNs and DiCNs exhibit higher resolution with HRMS than that with GC/MSMS. However, low resolution results may cause uncertainty of quantification. Besides, higher peak of RS (13C-tetra-PCB) is attributed to low recovery efficiencies of Mono-CN to Tetra-CN as GC/MSMS is applied for the analysis." ， 欄位Project Year的內容是2018 ， 欄位Organizer的內容是"Environmental Analysis Laboratory" ， 欄位Executive Unit的內容是"國立中央大學" ， 欄位Reporting download URL的內容是https://epq.epa.gov.tw/project/filedownload.aspx?fid=183482 ， 欄位Publish Date的內容是20190108 。
Project Title
"Development of analytical method for PCN project (2/2)"
Project Subject
"The project for developing the method for the analysis of polychlorinated naphthalene (PCNs) in fly ash has been completed. The tests of pretreatments and instrument parameters have been carried out. The pretreatment tests were devided into extraction and clean-up process. The results of clean-up tests indicate that the effects of adsorbents on PCNs separation are significant and depend on the adsorption capability of adsorbent. Non-polar adsorbent such as activated carbon with a high specific area has the advantage of high adsorption capacity and can separate high boiling point interferences from analyzte, however, it has the disadvantages of being costly and time-comsuming. Additionally, in the test of the polar adsorbents, Aluminum exhibits a higher adsorption ability than Florisil. For the extraction test, dichloromethane (DCM), hexane/acetone (1:1, v/v) and toluene have been selected as solvents. The results show that DCM has a high extraction efficiency for Mono-CN to Tri-CN while higher extraction efficeiencies can be achieved for Tetra-CN to Octa-CN as toluene is applied as solvent. Besides, toluene also can effectively extract aromatic compounds from the high-carbon matrix such as flyash and sediment. Thus, toluene is selected to extract samples in this study. The Quality Assurance and Quality Control (QAQC) have also been conducted. The method detection limit has been evaluated repeatedly with 0.1 ng/mL PCN following the methods of NIEA-PA107. Furthermore, the results of the precision test indicate that the recovery efficiencies PCNs analyte and internal standard are within the range of 99.4%-106% and 51%-90.7%, respectively. The control standards of PCN recovery efficiency for NIEA are suggested according to the results. Comparison of PCNs analysis between High Resolution Gas Chromatography/High Resolution Mass Spectrometry (HRGC/HRMS) with 60 m column and Gas Chromatography/Tandem Mass Spectrometry (GC-MS/MS with 40 m) column has been made. The results point out that the properties of column are the critical to affect the separation efficiency of PCNs compounds. From Mono-CN to Tri-CN pattens, MonoCNs and DiCNs exhibit higher resolution with HRMS than that with GC/MSMS. However, low resolution results may cause uncertainty of quantification. Besides, higher peak of RS (13C-tetra-PCB) is attributed to low recovery efficiencies of Mono-CN to Tetra-CN as GC/MSMS is applied for the analysis."
Project Year
2018
Organizer
"Environmental Analysis Laboratory"
Executive Unit
"國立中央大學"
Reporting download URL
Publish Date
20190108
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