Nitrogen classification and main cause
At present, the operating principles of the Kjeldahl analyzers at home and abroad are based on the Kjeldahl method for measuring nitrogen. The main difference is their degree of automation and advanced technology. Therefore, the Kjeldahl analyzer is generally based on The degree of automation is divided into manual nitrogen determination instruments, semi-automatic nitrogen determination instruments and automatic nitrogen determination instruments (some are divided into semi-automatic nitrogen determination instruments, automatic nitrogen determination instruments, and automatic nitrogen determination instruments, all of which are the same). Let's take a look at the reasons why these nitrogen analyzers are defined.
The manual nitrogen determination instrument, as its name suggests, is operated manually, integrating the previous bottle and jar in one instrument, which increases the labor efficiency and safety factor of the work, and saves a lot of labor time. The semi-automatic nitrogen determination instrument can automatically Alkali automatic distillation automatic recovery of liquid is more convenient and safer than manual, and after all, it avoids contact with strong alkali. Automatic nitrogen determination instrument can automatically add alkali automatic distillation automatic recovery automatic titration, almost a set of steps can be automated, saves a lot of labor and time but also try to avoid the error caused by human operations, just the current domestic Most automatic nitrogen determination instruments do not have a titration system. The titration depends on manual or another titrator. The imported titration system can be matched.
The nitrogen determination instrument mentioned here is the designated nitrogen instrument distiller, which is the host of the nitrogen determination instrument. In fact, the Kjeldahl method includes the steps of digestion, distillation, absorption and titration, and there are samples before entering the azotizer. The pre-treatment process is the digestion process. This process is accomplished through a digestion furnace (ie, a digestion furnace). The digestion furnace is generally divided into four, six, eight, twelve, eighteen, and two according to the number of samples to be measured. Ten holes, twenty-four holes, and so on, where the hole is the number of samples that can be processed at once, that is, the four holes can handle four samples at a time. Here, the nitrogen analyzer is not divided into holes, usually only once. Can process a sample. The absorption of the sample is also performed on the distiller. As for the titration, the titrator can be manually selected or the titrator can be selected. The titrator can be used to determine the end point according to different methods such as a potentiometric titrator, a colorimetric titrator and a color determination titrator. The titrator is the most advanced, only a few can produce, of course, the price is also high.
In general, a set of nitrogen determination instruments (generally referred to as Kjeldahl) is composed of a digestion furnace, a distiller (master of nitrogen determination), and a titrator (optional), and some foreign models are integrated into the host of the nitrogen determination system. The three parts are composed. The nitrogen determination instrument (host) is divided into manual, semi-automatic and fully automatic categories. The digester has four holes and eight holes. The titrator has potential, colorimetric, color and other types. Users can match according to experiment needs.
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