ELSD: Design Principles and Structure
the evaporative light scattering detector (elsd) is a detector commonly used in liquid chromatography analysis. it is based on the principle of measuring the scattering of light from particles formed when the sample is atomized, evaporated, and converted into aerosol particles with the aid of an auxiliary gas. the basic structure of the elsd consists of three main components: aerosolization and droplet treatment, evaporation, and light scattering detection.
1. aerosolization and droplet treatment: the liquid phase is mixed with the auxiliary gas and passed through a nozzle or nebulizer to form a dense mist (liquid aerosol or droplets). due to the non-uniformity and inconsistency of the liquid aerosol, it requires treatment to ensure effective evaporation. this treatment process is called splitting, and different splitting techniques can be used, such as restrictor splitting, impactors, low-temperature splitting, and thermal splitting. different elsd types (type a and type b) are distinguished based on different splitting techniques, which affect the droplet treatment and evaporation efficiency.
2. evaporation: the aerosolized liquid undergoes further flow towards the heated region (evaporation zone or drift tube). in the evaporation zone, the liquid aerosol gradually evaporates under the influence of heat. components of the sample with low volatility form particles and are driven into the light beam channel by the auxiliary gas.
3. light scattering detection: the detection area contains a light source and a light detector. the light source forms a beam of light after optical processing, passing through the end of the drift tube. when the sample particles enter the light beam, light scattering occurs. the scattered light is detected by a light detector positioned at 90 degrees, generating a scattered light signal. by measuring the intensity of the scattered light, the quantity of sample particles can be predicted, and thus, the sample concentration can be determined.
the design principle and structure of the elsd allow it to detect samples that are not easily volatile in the liquid phase, providing a sensitive and versatile detection method suitable for various liquid chromatography analysis applications. depending on the nature of the sample and analytical requirements, the appropriate elsd type and operating parameters can be selected to obtain accurate and reliable analytical results.
车床的发展历史
喀什海运到澳大利亚,喀什到澳大利亚海运专线
“黄河流域如何发展绿色工业”一问，终于迎来“官方解答”！
广州到贵阳gy白云区物流公司专线运输,广州到gy白云区物流专线
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ELSD: Design Principles and Structure
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郑州到捷克搬家公司,郑州到捷克国际搬家海运
1. aerosolization and droplet treatment: the liquid phase is mixed with the auxiliary gas and passed through a nozzle or nebulizer to form a dense mist (liquid aerosol or droplets). due to the non-uniformity and inconsistency of the liquid aerosol, it requires treatment to ensure effective evaporation. this treatment process is called splitting, and different splitting techniques can be used, such as restrictor splitting, impactors, low-temperature splitting, and thermal splitting. different elsd types (type a and type b) are distinguished based on different splitting techniques, which affect the droplet treatment and evaporation efficiency.
2. evaporation: the aerosolized liquid undergoes further flow towards the heated region (evaporation zone or drift tube). in the evaporation zone, the liquid aerosol gradually evaporates under the influence of heat. components of the sample with low volatility form particles and are driven into the light beam channel by the auxiliary gas.
3. light scattering detection: the detection area contains a light source and a light detector. the light source forms a beam of light after optical processing, passing through the end of the drift tube. when the sample particles enter the light beam, light scattering occurs. the scattered light is detected by a light detector positioned at 90 degrees, generating a scattered light signal. by measuring the intensity of the scattered light, the quantity of sample particles can be predicted, and thus, the sample concentration can be determined.
the design principle and structure of the elsd allow it to detect samples that are not easily volatile in the liquid phase, providing a sensitive and versatile detection method suitable for various liquid chromatography analysis applications. depending on the nature of the sample and analytical requirements, the appropriate elsd type and operating parameters can be selected to obtain accurate and reliable analytical results.
车床的发展历史
喀什海运到澳大利亚,喀什到澳大利亚海运专线
“黄河流域如何发展绿色工业”一问，终于迎来“官方解答”！
广州到贵阳gy白云区物流公司专线运输,广州到gy白云区物流专线
火试金灰吹炉
ELSD: Design Principles and Structure
婴儿电子身高体重秤卧式体检仪
简析数控卧式车床的空运行及功能检验
轮毂数控车床系统维护工作介绍
SF6水分仪的常规使用方法
重庆到里尔国际空运,重庆空运到里尔,重庆到里尔空运
S30508不锈钢热处理工艺及硬度分析 百科
平顶山国际物流到日本的货代_平顶山到日本物流货代
选择深圳工业除尘器有何讲究？
风淋室结构和功能特点
北京到普洱空运公司,北京空运到普洱,北京到普洱航空货运
工矿防爆应急灯90W
上海到北京大兴机场货运专线返程配货_上海到大兴机场物流公司
无纺布车间为什么要加湿器?
郑州到捷克搬家公司,郑州到捷克国际搬家海运