MGS-2200 electric digestion instrumentMain technical indicators

(1) Temperature control range: 10 ℃~180 ℃ at room temperature (adjustable to 0.1 ℃)

(2) Stability: 0.1℃

(3) Temperature control time: 0~999.9min (adjustable arbitrarily, with the smallest adjustment of 0.1min)

(3) Digestive pores: 25 pores, pore size:? 16.5mm, suitable for digestive tubes with an outer diameter of 16mm. (The number and diameter of holes can also be customized according to user requirements)

(4) Power: 600W

(5) Temperature control method: Use the button to set the digestion temperature. (Please refer to the temperature controller manual for temperature setting)

(6) Heating time: 180 ℃<30min

(7) Heating block temperature setting: The numeric display on the keyboard indicates the minimum setting range of 0.1

（8）Power supply: AC220V ± 10%; 50Hz

MGS-2200 electric digestion instrumentMain features:

Using aluminum blocks with excellent thermal conductivity to make heating blocks, heating is both rapid and uniform; The surface treatment of aluminum blocks also has certain anti-corrosion properties;

Commonly used acid for digestion

Nitric acid (HNO)₃）Boiling point 120 ℃

Metals and alloys can be oxidized with nitric acid to their corresponding nitrates, which are usually soluble in water. Some metal elements, such as Au, Pt, Nb, Ta, Zr, are not dissolved. Al and Cr are not easily dissolved. Nitric acid can dissolve most sulfides.

Hydrochloric acid (HCl), boiling point 110 ℃

HCl is not an oxidizing agent and is usually not used to dissolve organic matter. HCl can react with many silicates and some insoluble oxides, sulfates, and fluorides under high pressure and high temperature to form soluble salts. Many carbonates, hydroxides, phosphates, borates, and various sulfides can be dissolved by hydrochloric acid.

Perchloric acid (HClO)₄）Boiling point 130 ℃

It is a strong oxidant that can completely decompose organic matter. But perchloric acid can explode when it comes into direct contact with organic matter, so it is usually used in combination with nitric acid. Or join HN0 first₃After a period of reaction, add HClO₄HClO₄It is mostly used for pre-treatment under normal pressure and is rarely used in closed digestion. It should be used with caution.

Hydrofluoric acid (HF), boiling point 112 ℃

Can effectively transform silicates into volatile SiF₄And leave other elements to be measured. A small amount of HF combined with other acids can effectively prevent the formation of silicates in the tested elements in the sample.

Sulfuric acid (H)₂SO₄）Boiling point 338 ℃

Sulfuric acid is an effective solvent for many organic tissues, inorganic oxides, alloys, metals, and ores. It can almost destroy all organic matter. Concentrated H₂SO₄The boiling point is 338 ℃, and H is generally not used alone₂SO₄But rather with HNO₃Combine and use together.

Phosphoric acid (H)₃PO₄）Boiling point 158 ℃

Hot H₃PO₄Suitable for dissolving iron-based alloys that cause specific trace components to evaporate and lose when digested with HCl, phosphoric acid can also dissolve chromite, oxidized iron ore, aluminum slag, etc.

Dissolve commonly used mixed acids

Wang Shui, HCl:HNO₃=3:1 v/v

Wang Shui needs to be prepared and used on site. Aqua regia can be used to dissolve many metals and alloys, including steel, high-temperature alloy steel, aluminum alloys, antimony, chromium, and platinum group metals. Plants and wastewater often use it for digestion. Aqua regia can acid wash out some metals from silicate matrices, but cannot effectively dissolve them completely. In addition to aqua regia, nitric acid and hydrochloric acid are often mixed together in other proportions. The so-called Lefort aqua regia, also known as inverse aqua regia, is a mixture of three parts nitric acid and one part hydrochloric acid. Can be used to dissolve sulfur oxides and pyrite.

HN0₃: H₂S0₄The commonly used ratio is 1:1 (v/v)

The highest temperature of this mixed acid is only higher than that of pure HNO₃The highest temperature at that time is about 10 ℃ higher. Under high temperature conditions, it is easy to form sulfate complexes and also has dehydration and oxidation properties. Usually, after completing the initial digestion, H can be added₂O₂To complete digestion. However, only when the liquid volume decreases and SO is emitted₂H can only be added after the gas has been added₂O₂The samples digested with it include polymers, fats, and organic substances.

HNO₃: HF， The commonly used ratio is 5:1 (v/v)

Some metals and alloys that are difficult to handle by other methods can react with this mixed acid and be dissolved. This mixed acid is particularly effective for dissolving metals such as titanium, niobium, tantalum, zirconium, hafnium, tungsten, and their alloys. It can also be used to dissolve rhenium, tin, and tin alloys, various carbides and nitrides, uranium and tungsten ores, sulfide ores, and various silicates.

H₂SO₄: H₃PO₄The commonly used ratio is 1:1 (v/v)

This mixed acid can generate extremely high temperatures under low pressure, so it should be used with caution. H₃PO₄Its function is to act as a solubilizer. Used for dissolving ceramics, especially some ceramics and refractory materials with high aluminum content.

HNO₃、 HCl, HF mixed acid

First prepare aqua regia (HCl: HNO)₃=4:1, v/v)， Prepare aqua regia: HF=7:3 (v/v). Or as HNO₃: HCI:HF=5: 15: 3 formulations (v/v). This mixed acid is suitable for dissolving alloys, silicates, rocks, slag, zeolites, glass, ceramics, etc.

Environmental field

Soil degradation

Instrument: ED36 PTFE digestion tube

Reagent:

1. Hydrochloric acid (HCl): ρ=1.19g/mL, of superior purity

2. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

3. Hydrofluoric acid (HF): ρ=1.49g/mL

4. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

Steps:

1. Weigh 0.2-0.5g of soil sample into a PTFE digestion tube and add 10mL of hydrochloric acid HCl into the digestion well.

2. Set the temperature of the digestion instrument to 100 ℃, heat until a small amount of sample remains, and then remove and cool.

3. Add 5mL of nitric acid HNO₃、 5mL hydrofluoric acid HF, 3mL perchloric acid HClO₄Cover it.

4. Set the temperature of the digestion instrument to 170 ℃, heat up for about 1 hour, cool down, and then open the lid.

5. Continue heating the silicon and raise it to 200 ℃. After a small amount of thick white smoke is emitted, remove and cool it. The liquid will become transparent.

Degradation of sewage

Instrument: ED36 polypropylene digestion tube or glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Sulfuric acid (H)₂SO₄)： ρ=1.84g/mL， Pure analysis

3. Potassium permanganate (KMnO)₄)：5%

Steps:

1. Take 20mL of sample (or an appropriate amount) into a polypropylene digestion tube.

2. Add 0.5mL nitric acid HNO₃、 1mL sulfuric acid H₂SO₄Mix the sample evenly.

3. Add 3mL of 5% potassium permanganate KMnO₄Leave the solution for 15 minutes. If the sample fades from purple or brown, add 2 ml of potassium permanganate KMnO₄Solution.

4. Place the lid on the digestion tube with a slight gap to allow for some pressure, but do not leave too much smoke.

5. Heat and reflux at 95 ℃ for 2 hours without boiling.

6. After cooling, the sample is completely dissolved.

Food sector

The digestion of rice

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

Steps:

1. Weigh 1.0g of rice sample that has been crushed and passed through a 100 mesh sieve into a digestion tube, plug it with a perforated tube plug, and add 10mL of mixed acid HNO₃HClO₄(4 1) Place the page.

2. Insert the perforated tube plug into the digestion hole of the digestion instrument, set the digestion instrument temperature to 65 ℃, slowly heat to completely mix the sample with acid, and maintain 65 ℃ for 15 minutes.

3. Heat up to 100 ℃. At this point, the digestion tube is filled with thick reddish brown smoke and held for 30 minutes. The sample is digested, and the sample solution is transparent and appears light yellow.

4. Open the tube plug, heat up to 180-190 ℃, remove excess acid, and the solution is colorless and clear, about 2ml.

The digestion of fish meat

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

Steps:

1. Dry the fish meat at 120 ℃, grind it in an agate mortar, weigh 0.5g of the ground sample into a digestion tube, and add 8mL of nitric acid HNO₃.

2. Insert the perforated tube plug into the digestion hole of the digestion instrument, set the temperature of the digestion instrument to 130 ℃, and adjust it from room temperature to about

Raise to 130 ℃ in 15 minutes.

3. After heating to 130 ℃, rinse the inner wall of the test tube with acid reflux and maintain for 20 minutes until the solution is basically clear.

4. Remove the cooling and add about 2 mL of perchloric acid HClO₄.

5. Set the temperature to 190-200 ℃, insert it into the digestion well of the digestion instrument, continue heating until white smoke is almost completely emitted, and 1-2 mL of solution remains. The solution is clear and transparent, basically colorless.

The digestion of milk

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

Steps:

1. Take 5mL of milk into a 50mL digestion tube and add 10mL of nitric acid HNO₃.

2. Insert the perforated tube plug into the digestion hole of the digestion instrument, set the temperature of the digestion instrument to 120 ℃, and raise it from room temperature to 120 ℃ for about 15 minutes.

During the heating process of the digestion instrument, acid reflux is used to clean the inner wall of the test tube. After heating to 120 ℃ and holding for 60 minutes, the solution is basically clear.

4. Remove the cooling and add about 2 mL of perchloric acid HClO₄.

5. Set the temperature to 180-190 ℃, insert it into the digestion hole of the digestion instrument, and continue heating until the white smoke is almost completely emitted.

The digestion of raisins

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

Steps:

1. Weigh a sample of raisins Add 5g to the digestion tube and 8mL of nitric acid HNO ₃.

2. Insert the perforated tube plug into the digestion hole of the digestion instrument, set the temperature of the digestion instrument to 130 ℃, and raise it from room temperature to 130 ℃ for about 15 minutes.

3. After heating to 130 ℃, reflux the acid to clean the inner wall of the test tube and maintain it for 30 minutes until the solution becomes clear.

The sample weighing amount, acid addition amount, digestion temperature, and heating time are only for reference. In practical operation, various parameters can be adjusted according to the different types of samples to achieve the desired digestion effect.

Plant field

Vegetable digestion

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

Steps:

1. Take the edible parts of fresh vegetables, wash them with tap water and distilled water in sequence, air dry their surface water, and place them in an oven at a constant temperature of 100-105 ℃ for drying. After taking them out, grind them finely and place them in a dryer.

2. Weigh 0.5g of finely ground vegetable sample into a digestion tube, plug it with a perforated tube plug, and add 15mL of mixed acid HNO₃HClO₄(4 1) Place the liquid.

3. Set the temperature of the digestion instrument to 65 ℃, insert the digestion tube into the digestion well, reflux the acid to clean the inner wall of the test tube, and mix the sample completely with the acid for 10 minutes.

4. Heat up to 100 ℃, at which point the digestion tube is filled with reddish brown thick smoke, and maintain for 30 minutes to digest the sample. If the sample is not completely digested, add 5mL of mixed acid HNO after cooling₃HClO₄(4 1) Reset the temperature and continue to dissolve until the sample solution is transparent and turns light yellow.

Digestion of Ginkgo biloba leaf extract

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

Steps:

1. Weigh 0.5g of the sample and add it to the digestion tube, then add 8.0mL of nitric acid HNO₃Insert it into the digestion well.

2. Cover the tube plug and set the electric digestion instrument to 120 ℃.

3. After heating to 130 ℃, rinse the inner wall of the test tube with acid reflux and maintain for 20 minutes until the solution is basically clear.

4. After reaching 130 ℃, continue to digest for 1.5-2 hours until a light yellow clear liquid is obtained, then remove it.

5. Heat up to 160 ℃ and continue heating for an appropriate period of time.

The dissolution of tea leaves

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

3. Hydrogen peroxide (H)₂O₂）30%, analytical grade

Steps:

1. Weigh 0.5g of tea sample that has been crushed and sieved through a 120 mesh sieve into a digestion tube (hard glass tube), and add 10mL of nitric acid HNO₃Insert the perforated tube plug and place it on the page.

2. Insert into the digestion well of the digestion instrument, set the temperature of the digestion instrument to 65 ℃, slowly heat to make the sample bubble and mix, and maintain a constant temperature of 65 ℃ for 15 minutes.

3. Heat up to 135 ℃, hold for 1 hour, and dissolve the sample.

4. If the digestion is incomplete, add 5mL of mixed acid HNO after cooling₃HClO₄(4 1), or add hydrogen peroxide H dropwise₂O₂Heat up and maintain the temperature until the solution becomes transparent.

5. Heat up to 160 ℃ and add acid to about 2mL.

Cosmetics field

Disintegration of cosmetics

Instrument: EHD36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Pure analysis

2. Sulfuric acid (H)₂SO₄)： ρ=1.84g/mL， Pure analysis

Steps:

1. Cosmetics generally contain organic ingredients such as ethanol and glycerol, and the solvents need to be evaporated in advance. Take 1.0g of sample, place it in a digestion tube, set the temperature to 90 ℃, heat for 5-10 minutes, and drive away the organic solvent.

2. Remove and add 5mL of water and 10-15mL of nitric acid HNO₃After leaving for a moment, continue heating for 5 minutes and remove.

3. Add 5mL of sulfuric acid H₂SO₄Set the temperature to 350 ℃, heat until white smoke is produced, and remove the constant volume.

Product quality control field

Degradation of paint and coatings

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

3. Hydrogen peroxide (H)₂O₂）30%, analytical grade

Step: 1 Take 0.2g of dried paint fragments and place them in a digestion tube. Add 10mL of nitric acid HNO₃Set the temperature to 160 ℃ and heat the sample.

During this process, add 1-2 mL of hydrogen peroxide H multiple times₂O₂， Add 1mL of perchloric acid HClO after Zui₄Heat until the sample is essentially dissolved.

3. Set the temperature of the digestion instrument to 180 ℃, continue heating until there is a small amount of liquid in the digestion tube, and adjust the volume to be measured.

Note: Due to the presence of some inorganic additives in the paint, there may be turbidity after filtration, which can be measured.

Smelting and mining field

Degradation of fly ash

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Sulfuric acid (H)₂SO₄)： ρ=1.84g/mL， Pure analysis

3. Hydrochloric acid (HCl): ρ=1.19g/mL, analytical grade

4. Hydrofluoric acid (HF): ρ=1.49g/mL

5. Boric acid

Step 1. Take 0.5g of the sample, place it in a digestion tube, and add 10mL of aqua regia (HNO)₃: HCl=1:3), 4mL hydrofluoric acid HF.

2. Set the temperature to 100 ℃, the heating rate to 120 ℃/h, and maintain it for 120 minutes.

3. Remove and cool to room temperature, add 2g of boric acid, and continue heating for 10 minutes.

4. After filtering, wait for testing.

Research field

Digestion of blood samples

Instrument: ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Perchloric acid (HClO)₄)： ρ=1.68g/mL， Superior purity

step

1. Take 2mL of blood and incubate it in a 37 degree water bath for 10 minutes. After separation at 3000 rpm for 10 minutes, prepare the blood for testing.

2. Accurately take 5mL of serum and place it in a digestion tube, add mixed acid (HNO)₃: HClO₄=20: 1) 2mL, shake while adding, shake well, let it sit for 10 minutes, insert it into the digestion well, set the temperature to 120 degrees, wait for nitric acid to decompose, set the temperature to 180-190 ℃, let the white smoke exhaust completely, evaporate to near dryness, and remove.

3. Add 1mL of distilled water and continue heating to remove acid twice.

4. After cooling, dissolve the residue in distilled water and shake well for testing.

Digestion of urine samples

Instrument ED36 glass digestion tube

Reagent:

1. Nitric acid (HNO)₃)： ρ=1.42g/mL， Superior purity

2. Hydrogen peroxide (H)₂O₂）30%, analytical grade

Steps:

1. Take 10mL of urine sample and add 2mL of nitric acid HNO into the digestion tube₃Shake well and let it sit for 10 minutes.

2. Set the temperature of the digestion instrument to 120 ℃, heat to boiling, and add 2 mL of hydrogen peroxide H dropwise during this period₂O₂Dissolve thoroughly, continue heating until colorless, remove and cool.

3. Add a small amount of distilled water to dissolve the residue, dilute to volume, and wait for testing.