Cleaning of chromatographic vials is very important. If the cleaning is not clean, it may affect the next measurement. Therefore, you must master the cleaning method of the chromatographic sample bottles. Below, Shanghai Jiapeng Technology introduces five cleaning methods.
With the increasing attention to food quality and safety, chromatographic analysis technology is increasingly used in food quality and safety testing, especially in the field of agricultural product testing, chromatographic analysis technology has been widely used.
In China, a large number of agricultural product samples (other chemical products, organic acids, etc.) need to be detected by liquid chromatography and gas chromatography every year. Due to the large number of samples, a large number of chromatographic vials need to be cleaned during the test, which not only wastes time and reduces work efficiency, but also sometimes results in deviations in the experimental results due to the cleanliness of the cleaned chromatographic vials.
Cleaning of chromatographic vials is very important. The cleaning method is selected according to the degree of contamination according to the glass instrument washing method, and there is no fixed mode. Method summary:
Option One:
1. Drain the chromatographic sample bottle into the test solution 2, all immersed in 95% alcohol, ultrasonic washing
After 2 times, it is dried, because the alcohol easily enters the 1.5mL vial and can be miscible with most organic solvents to achieve
3. Pour into clear water and wash twice with ultrasound.
4. Drain the inner washing solution and bake at 110 °C for 1~2 hours. Never bake at high temperature. 5, cooling, saving
Option II:
1, wash the tap water several times
2, placed in a beaker with pure water, ultrasonic for 15 minutes
3, change the water, then ultrasound for 15 minutes
4. Soak in a beaker with absolute ethanol
5, finally take out the natural air dry
third solution:
1. Soak with methanol (chromatographically pure) and ultrasonically clean for 20 minutes, then drain the methanol.
2. Fill the chromatographic sample bottle with water, ultrasonically clean for 20 minutes, then drain the water.
3. Dry the chromatographic sample bottle
Option 4:
1. Generally, it is first rinsed with water and then soaked with potassium dichromate wash solution.
2. The washing method of the chromatographic sample bottle is the same as the other in the liquid phase. First, use medical alcohol to infuse for more than 4 hours, then ultrasonic for half an hour, then pour out the medical alcohol, use water for half an hour, rinse with water. After drying, you can
Option 5:
1, if the cost is sufficient, each time with the new best
2. If it is to be reused, the cleaning method is also very important. First, soak it with strong oxidizing cleaning solution (potassium dichromate) for 24 hours, then wash it with deionized water three times under ultrasonic conditions, and finally wash it with methanol once and dry. Ready to use
3, the bottle mat must be replaced with new, especially when analyzing pesticide residues, must be changed, otherwise it will affect the quantitative results
The five cleaning methods for chromatographic vials are introduced to you. I hope that everyone can pay attention to the cleaning of chromatographic vials.
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