DTD-35D digital constant temperature digestion instrument

1principle：

Place the sample and digestive agent in the digestive tract and perform constant temperature digestion on the DTD-35D digital programmable constant temperature digestion instrument, so that the digested sample can be used for various instrument analysis and chemical analysis.

IISample scope:

Food samples, various water samples, biological samples (blood, urine, hair), cosmetics, etc.

3： Applicable analysis scope

Flame atomic absorption spectrometer and flameless atomic absorption spectrometer, atomic fluorescence spectrometer, ICP spectrometer, polarograph, chemical analysis method.

4： Performance:
(1) Temperature range: from room temperature to 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) Stability:+2 ℃.
(3) Digestive orifice number: 35, aperture: 26 millimeters, suitable for digestive tubes with an outer diameter of 25 millimeters.
(4) Power: 1500W
(5) Set the digestion temperature using a dial code.

5： Reagents and equipment:

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

（2）Plastic tweezers or bamboo clips: used to extract materials from 10% nitric acid solution soaked in glass equipment.

（3）Digestive tube: outer diameter 25MM * length 100MM flat low hardness glass, soaked overnight in 10% nitric acid before digestion, washed, soaked, air dried or dried before use.

6： Sample digestion method:

1Food sample digestion:

（1）Move the digestion instrument into the kitchen and heat it up until120℃。

（2）Absorption of liquid samples (such as Baijiu, purified water, natural water, etc.)1-10.0ML(Sample into digestive tube, add three glass beads) Place the digestive tube onto the digestion apparatus120Heat to near dryness at ℃ and add1.0ML(Digestive fluid)240Dissolve at a constant temperature of ℃ until almost dry, remove and cool, and measure to a certain volume.

（3）Weighing of general food (such as wine, drinks, fruit sugar, granules, flour food, Congee, etc.)0.500-1.000GPut the sample into the digestive tract, add three glass beads, and add10.0MLPut the digestive juice and digestive tube into the digestion apparatus160℃ digestion approximately1-3HAfter the digestive juice is clarified,240Dissolve at a constant temperature of ℃ until *, remove and cool, and make up to a certain volume for measurement.

（4）Weigh foods containing a large amount of oil and sediment (such as meat, sausages, soybean oil, milk powder, milk sugar, chocolate, etc.)0.300-0.500GAdd three glass beads to the digestive tract and add10MLDigestive solution, place the digestive tube onto the digestion apparatus160℃ digestion3HIf the solution has been clarified240Dissolve at a constant temperature of ℃ until almost dry, remove and cool, and measure to a certain volume.

2Water sample digestion:

Draw 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.

3Sample dissolution:

Weigh 0.200G of sample and add three glass beads to the digestion tube. Add 5.0ML of digestion solution and digest at 160 ℃ for 30MIN on a digestion instrument. Maintain a constant temperature of 240 ℃ until almost dry. Remove and cool to a certain volume for measurement.

4Cosmetics 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.

7： Precautions

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

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