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上海乔跃教判断如何使用水浴加热氮吹仪还是干式加热氮吹仪

2017-07-27 14:48:31      点击:
上海乔跃教判断如何使用水浴加热氮吹仪还是干式加热氮吹仪


1. 水浴加热通常是把需要加热的试管放置于盛水的烧杯中,热源对水加热,水再把热量传至试管,可以看做是一个间接加热过程,不同于干式的直接接触热源加热;另外由于


水浴加热过程中,可以在烧杯的水中插入一根温度计,用以实时观察水温从而可以很好的控制水的温度,干式加热法则很难实现温度的实时控制。 


2. 水浴加热过程中试管浸入烧杯水中,各部位受热比较均匀;而干式加热法过通常是试管底部比中上部受热多。 


3. 水浴加热升温慢降温也慢,而且加热温度不超过100℃,是一种“温和”的加热方式;干式加热法升温快降温快,加热温度可以高达150℃左右,可以认为是一种“急火”加热,


两种加热方式适用于不同的物质样品。 


4. 一些有机物质不宜接触明火,因此加热过程必须要用水浴方式;而有一些有机金属试剂不易宜接触水分,因此不能使用水浴加热方式(因为水浴加热会产生大量的水蒸


气)。


干式氮吹仪主要应用于大批量样品的浓缩制备,如药物筛选、激素分析、液相、气相及质谱分析中的样品制备。 


工作原理:通过将氮气吹入加热样品的表面,使样品中的溶剂快速蒸发、分离,从而达到样品无氧浓缩的目的,保持样品更纯净。


Shanghai qiyue education how to use water bath heating nitrogen blower or dry heating nitrogen blowing device


1. Water bath heating is usually need to heating of the tube is placed in a beaker of water, heat sources for heating water, water to hand to a test tube, the heat can be seen as an indirect heating process, is different from direct contact with heat source heating dry; In addition because


In the process of the water bath heating, insert a thermometer in a beaker of water, and be able to real-time observation of the water temperature is very good control the temperature of the water, dry heating law is difficult to realize the real-time control of temperature.


2. In the process of water bath heating, the test tube is immersed in beaker water. And the dry heating method is usually the bottom of the tube is hotter than the upper part.


3. Water bath heating temperatures slow cooling are slow, and heating temperature does not exceed 100 ℃, is a kind of "moderate" heating mode; Dry heat to heat up fast cooling fast, heating temperature can be as high as 150 ℃, can be thought of as a "JiHuo" heating,


The two heating modes are applicable to different material samples.


4. Some organic substances should not be exposed to open fire, so the heating process must be in the form of water bath; There are some organic metal reagents that are not easy to contact with water, so you can't use water bath heating (because water bath heating can produce a lot of water steaming


Gas).


Dry nitrogen blowing apparatus is mainly used in the preparation of bulk samples, such as drug screening, hormone analysis, liquid phase, gas phase and mass spectrometry.