1Digital constant temperature digestion instrumentIntroduction:

DTD-25DigesterDigestion principle: Place the sample and digestive fluid in a digestive tube, digest them at a constant temperature, and use them for various instrument and chemical analyses after thorough digestion of the sample. Digestive sample range: product samples, various water samples, biological samples (blood, urine, hair), cosmetics, etc.

Secondly:Digital constant temperature digestion instrumentTechnical parameters:

(1. Temperature control range: room temperature -300 ℃ (special note: temperature refers to the temperature of the constant temperature block, the temperature of the digestion sample solution, and the boiling point of the digestion solution *).

(2. Temperature stability: ≤ 1 ℃.

(3. Number of pores: 18, pore size: Φ26mm， Suitable for digestive tubes with an outer diameter of 25mm.

(4 Heating power: 1500W)

(5 temperature control methods: microcomputer PID control, dual screen LED display, clear and intuitive.).

(6 Timing Range: 1-9999 minutes)

IIIReagents and equipment:

(1 Digestive solution: nitric acid+high acid (4:1)

(2 plastic tweezers or bamboo clips: used to extract materials from 10% nitric acid solution used for soaking glass equipment.)

(3 Digestive tubes: outer diameter of Φ 25 × length of 80 (mm) flat low hard glass. Before digestion, soak the digestive tube in 10% nitric acid overnight, wash and dry it, or use it after drying.).

4Sample digestion method:

1. Food sample digestion:

(1. Move the digestion instrument into the kitchen and heat it up to 120 ℃.)

(2) Take 1-10.0ml of liquid sample (such as Baijiu, purified water, natural water, etc.) (put the sample into the digestive tube, add three glass beads), put the digestive tube into the digestion instrument and heat it to nearly dry at 120 ℃, add 1.0ml (digest the digestive solution at 240 ℃ to nearly dry at constant temperature, take it and cool it down, and measure it at a constant volume)

(3) Weigh 0.500-1.000g sample of general food (such as wine, beverage, fruit sugar, granules, flour food, Congee, etc.) into the digestive tube, add three glass beads, add 10.0ml digestive solution, put the digestive tube into the digester for digestion at 160 ℃ for about 1-3h) until the digestive solution is clear, digest it at a constant temperature of 240 ℃ to complete, take it down to cold, and fix the volume to a certain volume for determination

Weigh 0.300-0.500g of food containing a large amount of oil and sediment (such as meat, sausages, soybean oil, milk powder, milk sugar, chocolate, etc.) and add three glass beads to a digestion tube. Add 10ml of digestion solution and place the digestion tube in a digestion apparatus at 160 ℃ for 3 hours. If the solution has been clarified and digested at 240 ℃ until almost dry, take it and cool it down, and make up to a certain volume for measurement

2. Water sample digestion:

Transfer 1.00-10.0ml of sample into a digestion tube, add three glass beads, place the digestion tube on a digestion apparatus and heat it to near dryness at 120 ℃. Add digestion agent (0.50ml digestion agent for clean water and 2ml digestion agent for sewage) and dissolve it at a constant temperature of 240 ℃ until near dryness. Take it and cool it down, and measure it to a certain volume

3. Sample dissolution:

Weigh 0.200g of the sample and add three glass beads to the digestion tube. Add 5.0ml of digestion solution and digest at 160 ° C for 30 minutes on a digestion apparatus. Maintain a constant temperature of 240 ° C until almost dry. Remove and cool to a certain volume for measurement

4. Cosmetics dissolution:

Take 0.100-0.200g of cosmetics into the digestive tract, add three glass beads and 5-10ml of digestive solution. Digest at 160 ℃ for 1-2 hours until the solution is clear. Dissolve at 240 ℃ until almost dry. Remove and cool to a certain volume for measurement

5precautions

1. Some analytical methods require the acid (digestive fluid) to be completely removed before analysis, such as polarographic analysis and white ink furnace analysis

2. Partial analysis methods require the use of different digestive fluids and temperature controls, such as mercury measurement, digestive fluid nitric acid+sulfuric acid (4:1) The temperature control is always at 160 ℃

VIusage method:

Connect the power supply, turn on the power switch, and the temperature controller will display "InP" on the upper row and "range value" on the lower row of the display window. After about 3 seconds, it will enter the normal display state.

DTD-25Reference and setting of temperature and constant temperature time:

Click the "Settings" button to enter the temperature setting state. The prompt "SP" is displayed in the lower row of the display window, and the temperature setting value is displayed in the upper row (the first digit value flashes). The desired setting value can be modified by using the shift, increase, and decrease keys; Click the "Settings" button again to enter the constant temperature time setting state. The prompt "St" will be displayed in the lower row of the display window, and the constant temperature time setting value (flashing first) will be displayed in the upper row. The desired setting value can be modified by pressing the shift, increase, or decrease keys; Click the "Settings" button again to exit this setting state. The modified settings will be automatically saved, and the constant temperature digestion instrument will run according to the settings.

When the set time is "0", there is no timing function, and the digestion instrument will continue to operate at the set temperature. The lower row of the temperature controller displays the set temperature value, and the upper row displays the actual temperature; When the set time is not "0", the lower row of the display window will show the running time, and the last decimal place will light up. After the measured temperature reaches the set temperature, the timer will start counting, and the lit decimal point will flash. When the running time is up, the lower row of the display window will show "End" and the buzzer will beep for 30 seconds. If you want to continue running at this time, press and hold the "decrease" button for 3 seconds.

Customized LCD temperature controller and multi-stage program temperature control digestion instrument according to requirements