Preparation before use
Cleaning: New sampling bottles need to be thoroughly cleaned before use to remove any impurities and contaminants that may be present. Choose the appropriate cleaning method based on the material and purpose of the sampling bottle. For example, glass sampling bottles can usually be soaked in potassium dichromate solution, and then rinsed clean with tap water and distilled water in sequence; Plastic sampling bottles can be cleaned with mild detergent and then rinsed with pure water. For sampling bottles used for high-purity sample collection, special cleaning and passivation treatment may also be required.
Drying: The cleaned sampling bottle should be dried to avoid moisture affecting the sample. The drying method can be selected according to the material and shape of the sampling bottle, such as drying, air drying, nitrogen blowing, etc. For some moisture sensitive samples, it is necessary to ensure that the inside of the sampling bottle is completely dry.
Preprocessing (if necessary): Some special sample collection may require pre-processing of the sampling bottle. For example, when collecting volatile organic compound samples, in order to reduce the adsorption of the sample on the inner wall of the sampling bottle, a layer of anti adsorption coating can be applied to the inner wall of the sampling bottle; When collecting biological samples, the sampling bottles may need to be sterilized to ensure the sterility of the samples.
Sampling operation
Select appropriate sampling points: Select representative sampling points based on the sampling purpose and requirements. In environmental monitoring, sampling points should be able to reflect the overall environmental conditions of the monitoring area; In the industrial production process, sampling points should be set at key links that can accurately reflect the quality of materials.
Avoid contamination: During the sampling process, it is necessary to strictly follow sterile procedures (for biological samples) or non contaminated operating procedures to prevent external impurities, microorganisms, etc. from entering the sampling bottle and contaminating the sample. For example, using sterilized sampling tools to avoid direct contact between hands and the inner wall of the sampling bottle and the sample; At the sampling site, be careful to prevent dust, droplets, etc. from falling into the sampling bottle.