The principle of a nitrogen blower: There are two ways to speed up evaporation: to strengthen the air flow around it and its temperature. Nitrogen is also an inert gas that also acts as a barrier to oxygen and prevents oxidation. The nitrogen blowing instrument achieves the purpose of concentration through these principles. It rapidly, continuously, and controllably blows nitrogen onto the heated sample surface to achieve rapid concentration of large amounts of sample.
The technical advantages of the nitrogen blowing instrument: 1. It can process multiple samples at a time, and the advantages are more obvious in multi-factor and multi-level repeated experiments. 2. The experimental operation is simple and flexible. It is possible to register the accounting at any time without restriction to adjust the process of enrichment. 3. The operator does not need long-term maintenance during the experiment, saving manpower. 4. The rotary evaporator may cause loss of sample when the solvent is boiled, and the nitrogen blower is accurate and sensitive when concentrated to avoid sample loss. Use of nitrogen blowing instrument: After the nitrogen blowing instrument is installed, the chassis is supported in a constant temperature water bath, the water bath power is turned on, the water bath temperature is set, and the water bath starts to heat up. The nitrogen blowing instrument is lifted, and the samples that need to be concentrated by evaporation are respectively placed on the sample positioning frame and are lifted by the tray, wherein the height of the tray and the positioning frame can be adjusted according to the size of the training sample tube. Open the flow meter needle valve, the nitrogen gas reaches the gas distribution plate through the flow meter and the gas supply pipe, and after the gas is distributed, it is sent to the needle valve tube (mounted on the gas distribution plate) above each sample position. Then, the needle valve needle valve is adjusted through the net school, and the nitrogen gas is blown to the liquid sample test tube through the needle valve tube and the needle. The needle valve tube can be slid up and down by adjusting the lock nut, the needle height is adjusted, and the sample surface is blown with ripples, and the sample is again Do not splash as well. Finally, the nitrogen blower was placed in a water bath until evaporation and concentration was completed.
Application of nitrogen blowing instrument:Analysis of pesticide residues: such as vegetables, fruits, grains, plant tissue environmental analysis: such as drinking water, groundwater and contaminated water samples biological analysis: such as serum, plasma, blood, urine commodity inspection: such as testing Croft and other food drinks : For example, milk, wine, beer and other pharmaceutical drugs: such as Chinese medicine pharmaceutical nitrogen blowing instrument Note: (1) Do not use the nitrogen blowing instrument 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 blower should be carried out by a professional. Improper replacement of the components may cause damage to the nitrogen blower 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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