Solid phase extraction (Solid Phase Extraction) is to use a solid adsorbent to adsorb the target compound in the liquid sample, separate it from the sample matrix and interfering compounds, and then elute with the eluent or heat desorption to achieve the separation and enrichment goal The purpose of the compound. As a sample preparation technology, solid phase extraction has been more and more widely used in the laboratory.
SPE is a column chromatography separation process. The separation mechanism, choice of stationary phase and solvent are similar to high performance liquid chromatography (HPLC). However, the particle size of the SPE column packing (> 40! M) is larger than that of the HPLC packing (3 ~ 10! M). Due to the short column bed and large particle size, SPE column efficiency is much lower than HPLC column. A high-efficiency HPLC column can produce more than 10,000 trays, and 10-50 trays can be obtained from an SPE column. Therefore, SPE can only separate compounds with very different properties. In this case, instead of isocratic, a typical SPE separation is performed in a digital switching mode (digitaIon-offmode). This means that with a step gradient, the analyte is either firmly adsorbed by the stationary phase or not retained at all. Another difference from HPLC is that the SPE column is disposable.
The characteristics of the SPE column itself determine its scope of application. SPE technology with lower separation efficiency is mainly used to process samples. The objectives to be achieved with the help of SPE are: (1) remove interfering substances from the sample for later analysis; (2) enrich trace components to improve analytical sensitivity; (3) change the sample solvent to make it compatible with the analysis The methods are matched; (4) In-situ derivation; (5) Desalination of the sample; (6) Facilitate the storage and transportation of the sample.
Among the above points, purification and enrichment are the most important.
Shanghai Haozhuang Instrument Co., Ltd. adheres to the goal of "leading the precision with precision" and is committed to the development of scientific instruments and the expansion of monitoring system integration. The company aims to promote scientific and technological progress, environmental protection and improve people's quality of life. The company complies with relevant national and local laws, regulations and other requirements. In order to meet the needs of customers, through design improvement and production of green and environmentally friendly scientific instruments, the company controls important environmental factors in the entire process of product production and service, exerts influence on the environmental behavior of related parties, effectively uses energy and resources, and reduces production The impact of activities on the environment, continuously improve the company's performance, and promote the harmonious development of man and nature.
2 Door Cabinets are the top-rated series of our Steel Storage Cabinets. Reasonable design of the Lockable Metal Storage Cabinets make the installation of the Metal Cupboards very easy and quick. It takes 5mins for 2 people to finish the installation. There are over 100 kinds of Storage Cabinets With Shelves. You can find a modern style Home Office Storage Cabinet or something more traditional from our metal storage cabinets series.
2 Door Cabinets
2 Door Cabinets,Storage Cabinets With Shelves,Cabinets For Office,Tall Storage Cabinets With Doors
LUOYANG SHIDIU IMPORT AND EXPORT CO., LTD , https://www.shidiucabinet.com