The correct use of sampling bottles
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.
Correct sample collection: Collect samples according to the prescribed sampling methods and procedures to ensure accurate sample collection. For liquid samples, it is necessary to control the sampling speed and liquid level to avoid the generation of bubbles or splashes; For gas samples, appropriate sampling equipment and connecting pipelines should be used to ensure the accuracy and representativeness of the sampling.
Sample storage and transportation
Sealing: After sampling is completed, the sampling bottle should be immediately sealed to prevent sample leakage, volatilization, or reaction with external air. Select the appropriate sealing method based on the type of sampling bottle, such as using rubber plugs, plastic caps, metal threaded caps, etc., and ensure good sealing.
Identification: Clearly and accurately label sample information on the sampling bottle, including sample name, number, sampling time, sampling location, sampler, etc. The identification should be written in durable and non fading materials to accurately identify the sample during subsequent storage, transportation, and analysis processes.
Storage and transportation conditions: According to the characteristics of the sample and the requirements of the analysis method, place the sampling bottle in a suitable storage environment, such as refrigeration, freezing, avoiding light, etc. During transportation, necessary protective measures should be taken to ensure that the sampling bottles are not damaged and the quality of the samples is not affected. For example, using insulated boxes to transport samples that require refrigeration to avoid excessive temperature fluctuations.