The systematic error is also called the regular error. It is that under certain measurement conditions, when the repeated measurement is performed on the same measured size, the magnitude and sign of the error value (positive or negative value) remain unchanged; or when the condition changes, it changes according to a certain law. Error; the

What is high salt wastewater? High-salt wastewater refers to wastewater with a total salt content of at least 1%. It is mainly from chemical plants and oil and gas collection and processing. This wastewater contains a variety of substances (including salts, oils, organic heavy metals and radioactive materials). Treatment of high-salt wastewater: Evaporation method, electrochemical

Sorted by the size of the sample contact area, the area of ​​the concentric cylinder rotor is larger than the area of ​​the parallel plate and the cone plate. The rotor with a larger diameter can have more contact area with the sample than the rotor with a smaller diameter. Therefore, within the same measuring

When the reaction kettle of the reactor circulation heating device is operated, the temperature requirement is relatively high. Then, how much do you know about the heating of the reactor in the reactor heating device? The reactor circulation heating device has a high operating temperature, and usually the chemical reaction needs to be carried out

Bad habits during the experiment1. When the sample is weighed or measured, the data is first recorded on the draft paper, and the sample is finished and then copied to the record book; sometimes the record is completed after the experiment is completed;2, the steps that need to be timed, using the time on the

UV spectrophotometer If you have been to a chemical laboratory, you must be familiar with this instrument. To detect the type and purity of the substance, determine the composition and stability constant of the complex, study the reaction kinetics, organic analysis, etc., this instrument is inseparable. It is the UV spectrophotometer we are going to

Organic Structure Analysis and Infrared Chromatograph When we first heard the name of the infrared chromatograph, it should be said in the chemistry textbook that it can be used to test the functional groups of organic matter. The principle is because different structures absorb infrared light to different extents, which is reflected in the spectrum.

4 Types of Common Fire Accident Fire Accidents The occurrence of fire accidents is universal and can occur in almost all laboratories. The direct causes of such accidents are: 1. Forgot to turn off the power, causing the equipment or electrical appliances to be energized for too long, the temperature is too high, causing fire;

Capacity Analysis and Automatic Potentiometric Titrator The automatic potentiometric titrator is a common analytical instrument for capacity analysis designed according to the principle of potential method. The principle of the potential method is to select a suitable indicator electrode and a reference electrode to form a working battery with the solution to be tested. With

Solution pH and acidity meter At the middle school stage, we heard the teachers say that the PH test paper is used to test the acidity and alkalinity of the solution. When the test paper touches the solution, it will change color, and then read the PH according to the color. It was particularly magical