1、 Before use: Be prepared to avoid "innate contamination"

Check appearance: Before use, carefully observe whether there are cracks or scratches on the gas collection cylinder, especially on the sealing surface of the bottle mouth and jaw. If there is any damage, it may cause seal failure and should be replaced immediately. At the same time, check whether the matching silicone gasket or PTFE gasket is intact, whether there is aging, deformation, or stains. The sealing performance of the gasket directly affects the preservation effect of the sample.

Cleaning and sterilization (as needed):

For gas or inorganic liquid samples, the inner wall of the bottle can be rinsed 2-3 times with deionized water, and then dried with nitrogen or clean air;

If used for organic samples or high-precision analysis, it is necessary to soak in organic solvents (such as methanol, acetone) for 10-15 minutes, ultrasonically clean and air dry to avoid residual impurities interfering with the detection;

When sterilization is required in the fields of medicine or biology, high-pressure steam sterilization (121 ℃, 20 minutes) can be used, but it is necessary to confirm that the material of the gas collection cylinder is high-temperature resistant glass (such as borosilicate glass), and the plastic material needs to be sterilized with ethylene oxide.

2、 Sampling: Standardized operation to eliminate "secondary interference"

Choose the appropriate tool: Select the sampling method based on the sample state (gas/liquid). Gas sampling can be connected to gas sampling cylinders using specialized syringes or sampling valves, while liquid sampling requires pipettes or droppers to avoid direct dumping and residual sample at the bottle mouth.

Control sampling volume: The optimal sampling volume for a 12mL gas cylinder is usually 1/2-2/3 of its volume (i.e. 6-8mL), with reserved space to reduce sample spillage and facilitate sampling operations during subsequent analysis.

Sealing technique: Place the gasket flat on the bottle mouth, ensuring no wrinkles, then close the clamp cap and use a special clamping tool to evenly clamp it. If you hear a "click" sound, it means the seal is in place. Be careful to avoid excessive force causing the bottle mouth to break, or uneven force causing poor sealing.

Clear marking: Immediately use a solvent resistant marker to mark the sample name, sampling time, location, and other information on the bottle body to avoid confusion, especially in batch sampling where standardized marking is necessary.

3、 Storage and transportation: controllable environment to prevent "sample deterioration"

Storage conditions: Select the storage environment based on the characteristics of the sample. For example, volatile organic compounds (VOCs) samples need to be stored away from light and at low temperatures (0-4 ℃), and analysis must be completed within 48 hours; Corrosive liquid samples need to confirm the material tolerance of the gas sampling cylinder (such as using plastic gas sampling cylinders for hydrofluoric acid samples) to avoid corrosion of the cylinder body.

Precautions for transportation: put the gas cylinder into a special foam box or sample rack to avoid loosening of jaws due to violent vibration. When transporting in bulk, a separated sample box can be used to prevent the bottles from colliding and wearing each other.

4、 After use: timely maintenance to extend the "service life"

Immediate cleaning: After the sample analysis is completed, the gas collection cylinder should be cleaned as soon as possible. If residual samples are left for a long time, they may corrode the bottle body or form stubborn stains. The cleaning process refers to the steps of "cleaning before use", and if necessary, a soft bristled brush (to avoid scratching the inner wall) can be used to clean the residue at the bottom of the bottle.

Maintenance of gaskets and jaw covers: After each use, remove the gaskets and clean them separately. After drying, store them by category; If there are stains on the jaw cover, wipe it with a damp cloth to avoid scratching the surface coating with hard objects. Gaskets are consumables and it is recommended to replace them regularly (usually after 5-10 uses, depending on wear and tear).

Storage method: Separate the clean gas collection cylinder, gasket, and clamp cover and store them in a dry, non corrosive gas environment. The gas collection cylinder can be inverted on a dedicated rack to prevent dust from falling in; The gasket should be placed in a sealed bag to avoid moisture or dust contamination.

Summary: Details determine 'sample reliability'

The core of using and maintaining a 12mL clamp gas cylinder lies in "preventing pollution and ensuring sealing". Strictly control the sampling process during use to avoid contact between the sample and the outside world; Pay attention to cleaning, inspection, and standardized storage during maintenance to ensure accurate sample basis in environmental monitoring, food testing, and other fields, while extending service life and reducing costs.