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首页> 外国专利> METHOD FOR QUANTITATIVE DETERMINATION OF THE CONTENT OF TRICHLOROETHYLENE AND TETRACHLOROETHYLENE IN ATMOSPHERIC AIR BY GAS CHROMATOGRAPHY WITH ELECTRON CAPTURE DETECTION

METHOD FOR QUANTITATIVE DETERMINATION OF THE CONTENT OF TRICHLOROETHYLENE AND TETRACHLOROETHYLENE IN ATMOSPHERIC AIR BY GAS CHROMATOGRAPHY WITH ELECTRON CAPTURE DETECTION

机译：通过气相色谱法测定大气空气中三氯乙烯和四氯乙烯含量的方法

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FIELD: analytical chemistry. ;SUBSTANCE: invention relates to analytical chemistry. A method for quantifying the content of trichloroethylene and tetrachloroethylene in atmospheric air by gas chromatography with electron capture detection includes air sampling by pumping through a sorption tube filled with a sorbent, subsequent thermal desorption, removal of a chromatogram and determination of the content of trichloroethylene and tetrachloroethylene according to a calibration schedule, while air sampling is performed by pumping air through a pre-cooled to 0°C sorption tube, filled with Tenax TA sorbent and at a rate of 0.1 l/min for 10 minutes; the air temperature and atmospheric pressure are recorded at the time of sampling, then the sorption tube with an air sample is subjected to thermal desorption in a thermal desorber, for this one end of the tube is connected to the capillary column of a gas chromatograph, the tube is heated to 250°C, after that a carrier gas (nitrogen) flow is passed through the second end of the tube for 10 minutes, at a speed of 20 cm3/min to carry the selected air sample into the trap, and the direction of the gas flow in the tube is opposite to the direction of the air flow into this tube during sampling, the sample is heated in the trap at 250°C for 2 minutes and the sample is analyzed, for this purpose, the sample is first held for trichloroethylene for 13.56 minutes, for tetrachloroethylene for 16.8 minutes, a chromatogram is taken, determining the peak area, and the concentration of trichloroethylene and tetrachloroethylene in the air is determined using a calibration graph, characterizing the dependence of the peak area from the content of the studied component in the chromatogram given taking into account the volume of air sampled for analysis to normal conditions, the analysis of concentrated air samples is carried out by capillary column BPX ID-VOL, 60 m*0.32 mm*1.8 mcm at temperature modes: column 50°C-100°C-230°C; evaporator 250°C; detector 250°C; flow rate of carrier gas (nitrogen) - 20 ml/min. ;EFFECT: creation of a highly sensitive and selective method for monitoring trichloroethylene and tetrachloroethylene in atmospheric air with low detection limits. ;1 cl, 1 dwg, 5 tbl
机译：领域：分析化学。 ;物质：发明涉及分析化学。通过气相色谱法通过气相色谱法定量大气空气中三氯乙烯和四氯乙烯的方法包括通过填充有吸附剂的吸附管，随后的热解吸，去除色谱图和三氯乙烯含量的吸附管来进行空气采样。根据校准时间的四氯乙烯，而通过将空气泵送到0°C吸附管，填充有Tenax Ta吸附剂的空气采样，并且以0.1L / min的速率填充10分钟;在取样时记录空气温度和大气压，然后在热解吸器中对带空气样品进行热解吸的吸附管，对于该管的一端连接到气相色谱仪的毛细管柱，将管被加热至250℃，之后将载气（氮气）流过管的第二端通过10分钟，以20cm 3 / min将选定的空气样品携带到陷阱中，并在取样过程中，管中气流中的气流的方向与空气流入该管的方向相反，将样品在250℃下在捕集器中加热2分钟，分析样品，为此目的，样品首先将三氯乙烯保持13.56分钟，用于四氯乙烯16.8分钟，取出色谱图，测定峰面积，并且使用校准图测定空气中的三氯乙烯和四氯乙烯的浓度，表征峰面积从研究的含量从研究中的研究组成的含量考虑到对正常条件进行分析的空气量，浓缩空气样品的分析由毛细管柱BPX ID-Vol，60 m *进行温度模式下0.32 mm * 1.8 mcm：柱50°C-100°C-230°C;蒸发器250°C;探测器250°C;载气（氮气） - 20mL / min的流速。 ;效果：在大气空气中产生高敏感和选择性方法，具有低检测限。 ; 1 cl，1 dwg，5 tbl

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