In this article, a detection method for organic explosives by capillary electrophoresis (CE) is developed based on previous detection techniques. Firstly, a buffer solution consisting of 50 mmol·L-1 sodium dodecy...In this article, a detection method for organic explosives by capillary electrophoresis (CE) is developed based on previous detection techniques. Firstly, a buffer solution consisting of 50 mmol·L-1 sodium dodecyl sulfate (SDS), 20 mmol·L-1 sodium tetraborate and 5% methanol was prepared and the UV detection in this buffer solution was conducted for three common organic explosives, including TNT, DNT and PETN. Then, the capillary UV detection method was investigated in terms of the transition time repeatability, the linear relationship between mass concentration and peak area and the limit of detection. The results revealed good reliability and stability of this method. In addition, these samples were characterized by photodiode array detector (PDA) to verify the qualitative results of UV detection.展开更多
The study investigated the occurrence of explosive compounds at four demining sites in Amuru District,Northern Uganda.The concentrations of explosive compounds octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX),2,4...The study investigated the occurrence of explosive compounds at four demining sites in Amuru District,Northern Uganda.The concentrations of explosive compounds octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX),2,4,6-Tri-nitrophenyl-n-methylnitramine(tetryl),2,4,6-trinitrotoluene(TNT),2,6-dini-trotoluene(2,6-DNT),cyclotrimethylenetrinitramine(RDX),nitroglycerin(NG)and Pentaerythritol tetranitrate(PETN)in soil samples collected from the demining sites were determined by liquid chromatography-tandem mass spec-trometry with atmospheric pressure chemical ionization(LC-MSMS-APCI).The LC-MSMS-APCI method was optimized and validated.The validation pa-rameters included were accuracy,precision,recovery,linearity,selectivity,lim-its of detection,and limits of quantification.The limit of detection and quan-tification of the target analytes ranged from 4.5-32.1 ng·mL-1 and 17-102.9 ng·mL-1,respectively.Recovery of the target analytes from the soil samples ranged from 76%-96%.The intra-and inter-day accuracy and precision values of below 15%indicated that the target analytes could be determined with rea-sonable accuracy and precision using the optimized method.The target analyte concentrations in soil samples ranged from 24.6 to 551.8μg·g-1 with RDX and TNT being dominant.All the soil samples analyzed had explosive residue con-centrations higher than the set chemical contamination values set by the US EPA PRGs Region 9 for Soil Screening Levels.展开更多
文摘In this article, a detection method for organic explosives by capillary electrophoresis (CE) is developed based on previous detection techniques. Firstly, a buffer solution consisting of 50 mmol·L-1 sodium dodecyl sulfate (SDS), 20 mmol·L-1 sodium tetraborate and 5% methanol was prepared and the UV detection in this buffer solution was conducted for three common organic explosives, including TNT, DNT and PETN. Then, the capillary UV detection method was investigated in terms of the transition time repeatability, the linear relationship between mass concentration and peak area and the limit of detection. The results revealed good reliability and stability of this method. In addition, these samples were characterized by photodiode array detector (PDA) to verify the qualitative results of UV detection.
文摘The study investigated the occurrence of explosive compounds at four demining sites in Amuru District,Northern Uganda.The concentrations of explosive compounds octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX),2,4,6-Tri-nitrophenyl-n-methylnitramine(tetryl),2,4,6-trinitrotoluene(TNT),2,6-dini-trotoluene(2,6-DNT),cyclotrimethylenetrinitramine(RDX),nitroglycerin(NG)and Pentaerythritol tetranitrate(PETN)in soil samples collected from the demining sites were determined by liquid chromatography-tandem mass spec-trometry with atmospheric pressure chemical ionization(LC-MSMS-APCI).The LC-MSMS-APCI method was optimized and validated.The validation pa-rameters included were accuracy,precision,recovery,linearity,selectivity,lim-its of detection,and limits of quantification.The limit of detection and quan-tification of the target analytes ranged from 4.5-32.1 ng·mL-1 and 17-102.9 ng·mL-1,respectively.Recovery of the target analytes from the soil samples ranged from 76%-96%.The intra-and inter-day accuracy and precision values of below 15%indicated that the target analytes could be determined with rea-sonable accuracy and precision using the optimized method.The target analyte concentrations in soil samples ranged from 24.6 to 551.8μg·g-1 with RDX and TNT being dominant.All the soil samples analyzed had explosive residue con-centrations higher than the set chemical contamination values set by the US EPA PRGs Region 9 for Soil Screening Levels.
