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How to ensure that the sample is not contaminated during the grinding process?
Release time:
May 28,2025
How to ensure that the sample is not contaminated during the grinding process?
Ensuring that the sample is not contaminated during the grinding process is the key to obtaining accurate test results. The following are some effective measures explained by the staff of Changsha grinder manufacturer:
1. Cleaning of grinding equipment
Pretreatment of equipment
Before using the grinding equipment, the equipment must be completely cleaned. For newly purchased grinding equipment, there may be impurities such as oil and metal debris from the production process, which need to be cleaned with a suitable detergent first.
For used grinding equipment, it should be cleaned in time after each use. Especially between grinding different types of samples, strict cleaning is required.
Verification of cleaning
In order to ensure that the grinding equipment is really clean, a blank test can be used for verification. Put the same amount of blank solvent (such as deionized water or pure organic solvent) as the actual sample into the cleaned grinding equipment for grinding, and then test the solvent after grinding. If the test results show that there is no impurity peak or the contaminant content is within an acceptable range, it can be considered that the equipment is clean and qualified and can be used for grinding the next sample.
2. Selection and treatment of grinding tools
Applicability of tool materials
It is crucial to select grinding tools of suitable materials. For some samples that are sensitive to metal ions, such as biological samples or trace element analysis samples, metal grinding tools that may introduce metal ion contamination should be avoided.
When grinding samples that are easily reactive with plastics (such as some organic solvents), avoid using grinding tools made of plastic materials to prevent chemical reactions between samples and tools and contamination.
Cleaning and specialization of tools
Grinding tools also need to be cleaned before use, and the cleaning method is similar to that of grinding equipment. Moreover, in order to reduce the risk of cross contamination, grinding tools should be managed in a specialized manner.
3. Environmental Control
Clean Grinding Environment
The grinding process should be carried out in a clean environment to minimize the contamination of the sample by dust and impurities in the surrounding environment. Ideally, grinding should be carried out in a clean laboratory or a space with an air filtration system.
If there is no clean bench, a clean and well-ventilated room should be selected, and the desktop and surrounding environment should be cleaned before grinding. Wipe the desktop with a damp cloth to reduce the possibility of dust.
Prevent interference from surrounding samples and reagents
In the grinding area, samples and reagents should be placed reasonably to prevent other samples or reagents from accidentally splashing into the sample being ground during the grinding process. Different types of samples should be kept at a certain distance, and protective measures such as using a protective cover can be taken when grinding samples that may splash. At the same time, volatile reagents should be properly stored away from the grinding area to prevent them from volatilizing into the sample and causing contamination.
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