Determination of MACHs in Ambient Air-Gas Chromatography, Shanghai HengPing Instrument and meter Co.,Ltd. (CAT#: STEM-AI-0413-YJL)

Determination of MACHs in Ambient Air-Gas Chromatography, model STEM-AI-0413-YJL is manufactured by Shanghai HengPing Instrument and meter Co.,Ltd. Benzene series, namely aromatic organic compounds (Monoaromatic Hydrocarbons, abbreviated as MACHs), is a general term for benzene and its derivatives, but benzene series are generally benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene The general term for benzene, styrene and benzene. Benzenes are the most common compounds in the atmospheric environment and many pollution source gases. They have certain harmful effects on human health and are important pollutants in the environment. There are two methods for the determination of benzene series in gas:
Activated carbon adsorption carbon disulfide desorption gas chromatography: This method uses activated carbon adsorption, carbon disulfide desorption, the sensitivity of this analysis method is low, and the used carbon disulfide often contains benzene that is not easy to remove. However, this method does not require special pretreatment equipment, and one sampling can be analyzed multiple times, especially when the concentration difference between the analyzed benzene series compounds is large or the concentration is high.
Thermal desorption injection gas chromatography: This method is to desorb the benzene series from the adsorbent by heating after the sample is adsorbed by the adsorbent, and then use the carrier gas to bring the benzene series to the chromatographic column for separation and analysis , This method has high sensitivity, does not need to use organic reagents, and has low background value. However, because the sample is injected at one time, when the concentration of the sample cannot be determined, it is sometimes necessary to conduct multiple sampling and analysis.
Shanghai Kechuang Chromatography Instrument Co., Ltd. has accumulated more than ten years of experience in ambient air analysis gas chromatograph, and has applied for a number of related technologies and continuously improved and optimized the instrument. The adsorption tube adopts the U-shaped tube of science and technology technology, which is directly inserted into the heating block to heat quickly and evenly, and the desorption effect is good.
Customers can choose the primary thermal desorption or secondary thermal desorption injection mode, and can also choose carbon disulfide desorption injection. The primary thermal desorption is the direct desorption of the sample through the adsorption tube; the secondary thermal desorption is the adsorption of the adsorption tube, the thermal desorption and injection after the secondary cold focusing, with high recovery rate, good component peak shape and high separation efficiency.
The HL-800 secondary thermal desorption instrument produced by the company can be used with various types of domestic and imported gas chromatographs or GC-MS instruments, and can also be modified to the original Kechuang gas chromatograph.

LCD screen or 5.7-inch color touch screen;
All microcomputer computer counter control system, a single computer can control less than 253 chromatographs, with 7 channels of temperature control; 8 channels of external event time programs;
The instrument has a built-in ambient air chromatography workstation, with intelligent identification/automatic processing of spectral peaks, integration and exchange of multi-channel spectra, automatic conversion of sampling volume to standard state according to ambient temperature and pressure, and automatic calculation of each component and overall unit of sampling volume. It can also deduct the peak area of ​​each component in the solvent and the content of each component in the outdoor air sample to obtain the final result, etc.;
The instrument adopts RJ45 network cable interface, signal output, control and acquisition are simple and convenient, which can realize remote control of the instrument and remote data transmission processing and supervision. It can be connected to the supervisor of the unit and the superior supervisor, which is convenient for supervisors to implement supervision;
Large-capacity column oven with automatic back door, 8-step temperature programming, and control function of column oven near room temperature (5°C above room temperature);
It has the function of fault self-diagnosis, showing the fault location and nature at any time; it has the function of over-temperature protection, and the heating will be automatically stopped if the temperature of any route exceeds the set temperature.

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