The calibration period of the laboratory analysis measuring instrument is affected by many factors such as the frequency of use, accuracy requirements, use environment, and performance. It can be said that determining the calibration cycle is a complicated task. Many analysts often have questions about the following issues, such as how to determine the principles
1. Common glassware, equipment and application scope of organic chemistry experiments The glass instruments, metal appliances, electrical instruments and some other equipment used in organic chemistry experiments are introduced as follows: (1)glass glassware Organic experimental glass glassware (see pic 2.1, pic 2.2), according to the standard of the mouth plug and grinding, and divided into
Gas chromatography often runs 24 hours due to the need for continuous production. It is difficult to have the opportunity to systematically clean and maintain the instrument. Once there is a suitable opportunity, it is necessary to thoroughly clean and maintain the key components of the instrument as much as possible according to the actual
The PH meter used the unit to ask the following questions: The PH meter requires three points of correction, and 2 points are not enough. With the correction made by 7.004.01, if the third point is to use the 9.21 buffer or which of the other buffers such as 10.01, 9.18, 12.46, 1.68, etc.? How
First, what is osmotic pressure? The semipermeable membrane is separated, one of which is the solvent water, and the other is the solution, and the water permeates through the semipermeable membrane to the solution side. The pressure applied to the solution side to prevent the movement of water is called the osmotic pressure. The reason
1. Sterile homogenizer Disconnect the power supply and disconnect the plug if it is not used for a long time. Prevent the aging of electronic components inside the aseptic homogenizer. 2. Do not open the sterile homogenizer door when working on the hammer plate to avoid overflow of the sample liquid. It should be built
Pipettes are instruments commonly used in biological and chemical laboratories to remove trace amounts of liquids. The advantages are easy to operate and high accuracy. With it, laboratory pipetting is no longer the main reason for analysis errors. For those things you have to know about pipettes, see below! 1. The pipette is an upgraded
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
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