Digestion furnace digestion method and use instructions

This step is digested during each Kjeldahl experiment. You can use the digestion cooker alone or collect the digestion process in the Kjeldahl instrument. We are in the digestive

In the case of quality, it is generally necessary to put the substance to be digested into the cooking pot and then add the digestive juice. Different substances are added to the digestive juice.

Use of the digestion furnace: The digestion furnace is a special purpose for food, food, feed, soil, fertilizer, water, sediment, chemicals, dairy products, brewing, sugar, drugs,

An instrument for digesting substances such as coal and rubber. The chemical reaction between the digestive juice and the substance produces a new substance that is soluble in water, and the selection of an appropriate digestive juice accelerates digestion.

Cheng. Therefore, the digestion furnace is usually used in conjunction with a nitrogen analyzer. Reagents used: A, concentrated sulfuric acid (H2SO4): chemically pure, content 95%~98%, nitrogen-free B, copper sulfate

(CuSO4.5H2O), potassium sulfate (K2SO4): analytical pure C, NaOH solution: chemically pure, 400g dissolved in 1000ml of distilled water, formulated into 40% aqueous solution (m / v) D, boric acid

(H3BO3): Analytically pure, 2g dissolved in 100ml of distilled water, formulated into 2% aqueous solution (m/v) E, hydrochloric acid (HCL): analytically pure, 0.05mol/L standard solution, (4.2ml hydrochloric acid is injected into 1000ml

Distilled water) Sodium carbonate method to calibrate hydrochloric acid F, mixed indicator: methyl red (G5H5N3O2) dissolved in ethanol to form 0.1% ethanol solution, bromocresol green dissolved in ethanol to form 0.5% ethanol

The liquid and the two solutions are mixed in a cool place with an equal volume (storage period of three months).

Precautions:

1. When digesting, such as gas escape, increase the pressure of tap water. Digest the outer wall of the seal ring and clean it once every test.

2, NaOH solution is not used for a long time, the tube is prone to sticking phenomenon, switch to manual mode after the daily work is completed, the NaOH solution external skin tube is moved into the distilled water bottle,

The front of the digestive tube is washed several times. When it is used next time, 100 ml of NaOH must be discharged during the distillation to prevent the first sample from being insufficient in NaOH concentration. After a while with dilute sulfuric acid

Wash the evaporating furnace and wash it with water several times.

3, in order to avoid interference, to ensure the normal operation of the instrument and personal safety, the grounding line must be strictly in the operation process.

4. If the operation is not correct, after the 10A fuse is blown, please unplug the power plug, replace it with a new one, turn off the water tap, open the drain faucet and drain the boiler water.

Try the steps to reboot.

5. Under the conditions of the user's transportation, storage, installation and use procedures of the instrument, if the instrument cannot work normally due to manufacturing problems, one year from the date of receipt of the goods

If you find that the package is defective and damaged during the unpacking, the accessory does not match the packing list, and there are few parts, please contact the quality inspection department of the company. Digestive tube: Material: PTFE digestion

Tube, quartz tube and glass tube.

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