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The principle of vacuum filtration is forming the negative pressure to drive the filtration at the outlet of the filtrate. This kind of filtration according to the forms of operation is divided into two types: batch operation and continuous operation. The vacuum filtration with batch operation can filter suspensions of various concentration. And the one with continuous operation always uses to filter the thick suspensions with many solid particles. A simple filtration is a container that is separated into the upper chamber and the lower chamber by filter media. People put the suspension into the upper chamber. The suspension pass through the medium from the upper to the lower. And the solution in the lower chamber is filtrate. The solid particles remained on the surface of the filter medium is filtration residue. The filtration residue becomes more and more when the vacuum filtration is working. This situation causes the larger resistance. People should stop the filtration work when there is filled with the filtration residue or the speed of filtration is slow and clean up the residue. What people do is to make the filter medium rework or regenerate so as to complete a filtering cycle.

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Advantages And Application Prospects Of QuEChERS

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QuEChERS method has unique advantages in pesticide residue analysis. Due to the irrational use of pesticides and inadequate supervision of pesticide use, people may suffer from acute or chronic pesticide poisoning after eating pesticide-contaminated food, and even threaten human health or life safety. Since the advent of the QuEChERS method, many laboratories such as the US FDA have conducted effective evaluation and verification of the method, and some laboratories have applied the method to routine pesticide testing. The advantage of QuEChERS 1. Improve the working efficiency of the laboratory; 2. Reduce possible instrument maintenance time; 3. Improved analysis efficiency; 4. Reduce the number of potential distractors. The application prospect of QuEChERS In China, this method is not only suitable for sample pretreatment of multi-residue detection of agricultural products but also widely used in environmental pesticide residue detection, agricultural veterinary drug detection, biological sample drug detection, and other fields. With the progress of science and technology and the continuous development of modern detection methods, QuEChERS method is bound to be more mature and will gradually be used in daily pesticide residue monitoring.

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Main Points Of Maintenance Of Hawach Glass fiber Extraction Thimble

Hawach glass fiber extraction thimble is made of 100% pure super-fine glass micro-fiber without any binding elements. It is mostly used to monitor stationary pollution sources. It has low background response, high collection efficiency and small differences among different batches even can be used in the flue of 600℃. The maintenance of this production is particularly important to the users. Proper using and maintenance can markedly prolong its service life and improve work efficiency. Here the author proposes four main points of maintenance of glass fiber extraction thimble as follows: 1. Before to use, introduce bactericides into the raw water to kill germs and micro-organisms and keep a suitable concentration of the nitrogen in it carefully. These measures are helpful to inhibit the growth of bacteria on the surface of our product. 2. In use, the glass fiber extraction thimble should be cleaned regularly. Rinse it with clean water, the special chemical cleaning agent is necessary to join in sometimes. 3. In use, the dramatic changes of pressure should be avoided to the retard the product material aging. The sudden impact can do great damage to the product. 4. when the solution has a high colloid content, it should be treated by sedimentation prior to the using. when the compounds are recovered after filtering, reference should also be made to the properties of raw water. In a word, there are many effective measures for the maintenance of glass fiber extraction thimble, we should strengthen the learning of professional methods. Even if the product is newly bought, maintenance work is always very important.

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The Basic Knowledge About Vacuum Filtration