Precautions and main classification of new nitrogen blow dryer
The Turboap Sample Concentrator is also called: nitrogen concentrator, nitrogen purifier, nitrogen concentrator, sample concentrator, abbreviated as: nitrogen blower, nitrogen blower, concentrator. Usually, nitrogen is blown into the surface of the heated sample to concentrate the sample, which is characterized by time saving, convenient operation, and easy control, and the expected result can be quickly obtained. Widely used in pesticide residue analysis, commodity inspection, food, environmental, pharmaceutical, biological products and other industries and in sample preparation for liquid, gas and mass spectrometry
Background
Background
"Rapid Residue Rapid Detection Technology (MRSM) in Agricultural Products and Producing Areas" is an international advanced agricultural science and technology project introduced and implemented by the Ministry of Agriculture Environmental Protection Agency and the Ministry of Agriculture Environmental Monitoring Station. The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the China National Standardization Administration Committee issued the “Method for the detection of melamine in raw milk and dairy products†issued by the National Standardization Administration Committee of China, 2008-10-07, requiring the use of YGC nitrogen blow dryer for milk. Sample pretreatment of melamine in dairy products: see 3.3: Instruments and equipment in this test method.
Applications
It has practical effects in pharmaceuticals, food safety, especially infant and baby milk, medical tests, pesticide residues, and provides time-saving and efficient preparation and processing of samples in gas chromatography (GC), liquid chromatography (HPLC) and other analytical methods. The platform is the best supporting equipment for solid phase extraction technology.
Main classification
1. According to the structure of the instrument heating tank: square and circumferential nitrogen blowing instrument
2. According to the instrument heating method: metal dry bath and water bath nitrogen blower
3. The metal dry bath type heating carrier has aluminum block hole type dry bath, aluminum bead bath and fine yellow sand bath. The aluminum bead bath is the most high-grade.
Precautions
How to use and maintain nitrogen blower
1. Purpose
Standardize the operation procedure of the nitrogen blowing instrument, strictly use the nitrogen blowing instrument to ensure the inspection work, the personal safety of the operator and the safety of the equipment.
2 Scope of application
Suitable for use in the operation of nitrogen blowers.
3 duties
3.1 The operator uses a nitrogen blower in accordance with this procedure.
3.2 The custodian is responsible for supervising whether the operation is in compliance with the regulations and maintaining the test on a regular basis.
The head of the department is responsible for the comprehensive management.
4 method of operation
4.1 Preparations.
Before using the nitrogen blower, operators should be familiar with the engineering process and procedures. Rapid concentration requires mastering the balance between sample volume, nitrogen flow rate, bath temperature and needle position. Improper use will be half the effort, even contaminating the sample or causing sample loss. At the same time, attention should be paid to the environmental conditions such as the degree of air pollution in the fume hood, nitrogen purity, and sample transportation.
4.2 water bath operation
4.2.1 Turn on the water bath power switch.
4.2.2 Set the bath temperature. Press the temperature to set the first button on the left side of the display panel, the upper display shows "SP", then press "∧" or "∨", the lower row shows the desired temperature value, but the first one on the left The key returns. Usually the bath temperature should be less than the solvent boiling temperature of 2-3 °C.
4.3 Nitrogen blowing operation.
4.3.1 Raise the nitrogen blower to the highest position and lock it.
4.3.2 Place the sample tube on the sample holder, fix the tube with the sample holder spring, and place the bottom of the tube on the support tray to record the position of the sample. If the support tray is too low, loosen the two set screws on the center ring of the support tray. Raise the support tray until the bottom of the tube is on the tray, no less than 15mm from the positioning frame. Adjust the support tray so that the slits are aligned with the tube. Tighten the set screw again to secure the support tray.
4.3.3 Install the stainless steel needle and put it directly.
4.3.4 Open the nitrogen bottle and adjust the flow meter to supply air to the nitrogen blowing instrument. Nitrogen only needs to be opened a little, otherwise the pressure will overwhelm the pipe. Adjust the flow meter to the desired pressure.
4.3.5 Lower the needle until the needle is 6 mm from the surface of the solution. Adjustment: Unscrew the lock nut on the gas distribution plate, the needle valve tube can slide up and down, adjust the height, and tighten the lock nut.
4.3.6 Open the flow valve of the sample position of the YGC-12D circular water bath nitrogen blower. When opening the flow valve, rotate 1/8 to 1/6 turn counterclockwise. Do not rotate too much to prevent the needle nut from falling off. When installing, it should be rotated clockwise.
4.3.7 Before concentrating the sample, it is recommended to blow the nitrogen gas for 5-10 minutes to prevent residual impurity gas in the gas path of the nitrogen blowing instrument.
4.3.8 Adjust the flow rate required by the flow meter to the nitrogen blower. Begin the nitrogen blow and fine tune the flow rate with the flow valve above the needle. And monitor the supply pressure, no more than 200Kpa. Adjust the flow valve so that the airflow creates ripples on the sample surface, but should prevent splashing.
4.3.9 Continuous vaporization until completion. According to the non-dry boundary point requirements, vaporization must be monitored and the sample removed after reaching the desired boundary point.
4.3.10 When vaporization is complete, use a clean pipette and rinse the stainless steel needle with one or two drops of solvent.
4.3.11 Slide the needle valve up and remove the sample tube from the sample holder.
4.3.12 Turn off the air supply after the vaporization is completed.
4.3.13 Turn off the flow meter and flow valve.
4.3.14 Turn off the water bath power supply.
4.3.15 Remove the stainless steel needle.
5 Precautions and maintenance
5.1 Heating medium The special oil can be heated using distilled water, deionized water and a water bath. It is best to use distilled water and deionized water to prevent the formation of dirt on the wall of the water bath.
5.2 The water in the water bath is recommended to be changed one day, no more than one week.
5.3 After each use of the needle should be cleaned to minimize needle contamination. Organic solvent washing, autoclaving and Soxhlet extraction techniques can be used.
5.4 The bottom of the bath is ash resistant but not waterproof. Never soak the water bath in any liquid or place it where it may be soaked.
5.5 Register the usage record after use.
Precautions for using a nitrogen blower
(1) Nitrogen blowing equipment is not used for substances with a burning point below 100 °C.
(2) Hands and eyes should be protected when using a nitrogen blower.
(3) The nitrogen blower should be used in a fume hood to ensure good ventilation.
(4) Do not move the nitrogen blower while heating to prevent burns.
(5) Use with a three-wire grounded power supply.
(6) Do not open the water bath casing with electricity to prevent electric shock.
(7) The maintenance of the nitrogen blowing instrument should be carried out directly by a professional or by the manufacturer. Improper replacement of the components may cause damage to the nitrogen blowing instrument or cause safety hazards.
(8) Do not use a nitrogen blower for highly flammable substances such as petroleum ether.
(9) Do not use acidic or alkaline substances, otherwise the nitrogen blower will be damaged.
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