LPG flow meter liquid phase

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1. Briefly describe the main similarities and differences between liquid-phase microextraction and solid-phase microextraction methods. The similarities and differences between liquid-phase microextraction and solid-phase microextraction methods are as follows: Liquid phase microextraction (LPME) technology is a fast, accurate, highly sensitive, and environmentally friendly sample pretreatment technique that has been developed since 1996 with the advancement of environmental analysis technology. In a broad sense, this technology mainly includes the following two aspects: (1) droplet liquid phase microextraction based on suspended single drop microextraction (SDME) form of suspended droplets;

(2) Liquid liquid microextraction or liquid-liquid liquid microextraction based on hollow fiber two-phase mode or three-phase mode. Due to its advantages of easy operation, speed, low cost, and ease of integration with chromatographic systems. In recent years, as a new type of sample pretreatment technology, it has attracted the attention of many researchers in the field of environmental analysis. The characteristics of liquid-phase microextraction are: the amount of organic solvent used is small, usually several to tens of microliters, with less pollution; The extraction, purification, and concentration of the target substance are carried out in one step, which is easy to operate and has low labor intensity; No special equipment required, low cost; By adjusting the polarity or acidity of the solvent used for extraction, selective extraction can be achieved and matrix interference can be reduced. Extraction models for liquid-phase microextraction: static liquid-phase microextraction and dynamic liquid-phase microextraction

. Solid Phase Extraction (SPE) is a sample pretreatment technique that has been developed since the mid-1980s. Developed by combining liquid-solid extraction and liquid chromatography techniques. The separation, purification, and enrichment of samples are mainly achieved through the selective adsorption and desorption process of sample components using solid-phase fillers. The main purpose is to reduce sample matrix interference and improve detection sensitivity. The basic principles and methods of solid-phase extraction: SPE technology is based on the theory of liquid-solid phase chromatography, and uses selective adsorption and selective elution to enrich, separate, and purify samples. It is a physical extraction process that includes both liquid and solid phases; It can also be approximated as a simple chromatographic process. Solid phase extraction (SPE) is a liquid chromatography separation principle that utilizes selective adsorption and selective elution. A commonly used method is to pass a liquid sample through an adsorbent, retain the analyte, then use a solvent of appropriate strength to remove impurities, and then use a small amount of good solvent to elute the analyte, thereby achieving rapid separation, purification, and concentration. It can also selectively adsorb interfering impurities and allow the measured substance to flow out; Or simultaneously adsorb impurities and the test substance, and then selectively elute the test substance using a suitable solvent.

2. What is the principle of proximity alignment assay?

3. How do you say "lean meat powder" in English

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