GS graphite digester is equipped with Teflon tube to drive acid digestion and constant volume

  GS graphite digester is a heating device specially designed and manufactured for laboratory heating, which can be used for sample heating, culture and drying
It adopts international advanced technology, which has the advantages of fast digestion, high efficiency, energy saving and convenience
It adopts digital circuit PID to control the temperature, which is more accurate
High purity and high-quality graphite heating carrier with Teflon coating on the surface is acid and corrosion resistant
It has been successfully used for sample pretreatment in environmental protection, chemical industry, food, medicine, biochemistry and other industries
At the same time, it can be used for pretreatment and acid driving treatment of microwave digestion
It is an ideal supporting product for analytical instruments such as atomic absorption, atomic fluorescence, ICP-AES and so on
Main features of graphite digester
1
Design: simple, upright and generous appearance
2
Clean and corrosion-resistant: the heating body of normal temperature digester adopts extra thick PFA coating, which is anti-corrosion and pollution-free
The unique spraying process is adopted, and the coating is uniform, firm and will not fall off after long-term use
3
High efficiency: the advanced integrated surrounding heating method is adopted, and all parts of the sample are heated evenly, which greatly prevents the loss of heat, eliminates the temperature difference of different parts of the same sample, and digests quickly and thoroughly (the traditional electric heating jacket and electric furnace can only heat the local part of the sample container
The heating of the sample is uneven, and there is a certain temperature difference in each part of the sample
In addition, the open heating mode has great heat loss, resulting in a large gap between the sample temperature and the surface temperature of the heater
)
4
Economy: the traditional thermal digestion of samples generally takes several hours, and the samples that are difficult to digest even take several days, which consumes a lot of electric energy; The surrounding heating process is fast and convenient, which can save 75% of electric energy and low cost
5
Accurate temperature control: PID temperature control system, simple and convenient operation, excellent performance and durability
High temperature control accuracy, up to & plusmn; 1 ℃, stable heating rate
6
Superior thermal conductivity: the reasonable heating method is matched with the heating body with superior thermal conductivity, which can ensure the temperature uniformity between each digestion hole, and the temperature difference between samples is less than & plusmn; 1
5  ℃ (normal temperature - 260 ℃), when digesting multiple samples at the same time, it can ensure that each sample has the same reaction temperature and conditions for batch processing
Typical applications:
· EPA methods for soil treatment: 3010a, 3010b, 3050b, 3060, etc
· EPA method for water treatment; 2002
2, 200
7, 200
8, 200
9, 245
1, 365
1, etc
· Processing methods of electronic products: SJ / 11365-2006, etc
· Coating treatment method: GB / t22788-2008, etc
· Soil treatment method: GB / t22105 1-2008、GB/T22105
2-2008、GB/T22105
3-2008, etc
· GB method for food processing GB/T17138-1997、GB/T5009
11-2003、GB/T5009
17-1996, etc
Advantages:
● the sample dissolving cup can be directly and stably placed for sample thermal pretreatment or treatment
The volume and acidity of the sample solution after microwave digestion
● for samples with violent chemical reaction, unknown components and large amount of samples, heat pretreatment shall be carried out before closed microwave digestion to increase the safety of samples during microwave digestion and shorten the digestion time in the microwave digestion instrument
● when the amount of samples to be digested is large, pretreatment can be carried out on the graphite digester to increase the amount of samples digested by microwave
Faster: 2-5 times faster than the traditional way of acid removal
More energy-saving: more than 50% energy-saving than the traditional way of acid removal
More uniform: temperature difference between holes &le& plusmn; 1℃@100℃
1
Number of samples digested at one time: Graphite digestion can digest more than 30 samples at a time, or even more than 40 samples
The number of samples digested at one time by microwave digestion is about 6-12

2
Digestion time: from the perspective of digestion time alone, the digestion time of microwave is shorter, but the cooling and acid removal after digestion and the total digestion time of multiple samples have their own advantages
3
Digestion efficiency: microwave can digest under high pressure, so some samples can be digested by microwave, but it is difficult to digest with graphite
For example, plastic and other samples

4
Safety: Graphite digestion is carried out under normal pressure, heating is uniform, no boiling and tank explosion, and there is no potential safety hazard; The microwave digestion is carried out under high pressure, and the instantaneous pressure rise will sharply increase the pressure in the digestion tank, which may explode
If people are nearby, it will be very dangerous, and the microwave digestion heating is not very uniform
Only one of them will be completely digested, and the others may not be completely digested

5
Time saving and labor saving: after microwave digestion, it is relatively troublesome to drive acid through plate digestion, but graphite digestion can drive acid at the same time, so customers with microwave digestion can also match another graphite digestion for acid driving, which is safe and convenient

Hold time, automatically stop heating after completing the heating procedure
Up to 100 heating procedures can be set
(optional)
 
 
Determination of cobalt in soils and sediments
Hot plate digestion: weigh the dry weight of 100 mesh sample to 0
5g (accurate to 0
1mg)
Place it in a Teflon beaker and add 2 ~ 3 drops of water to wet the sample
Add the acid type and corresponding volume shown in Table 7 in turn, cover and digest at 170 ℃ (EC and EF digestion system) / 180 ℃ (eg and EI digestion system) for about 1 hour, remove the fly silicon and drive out the acid, then control the temperature at 180 ℃ (EC and EF digestion system) / 210 ℃ (eg and EI digestion system), and evaporate until the solution is viscous (pay attention to prevent drying)
Remove the polytetrafluoroethylene beaker, cool it slightly, add 0
5 ml concentrated nitric acid, warm it to dissolve the soluble residue, transfer it to a 50
0 ml colorimetric tube, cool it, fix the volume with ultrapure water to the marking line, shake it well and wait for measurement

  Microwave digestion: weigh the dry weight of 100 mesh sample to 0
5g (accurate to 0
1mg)
Put it into the microwave digestion tank and add 2 ~ 3 drops of water to wet the sample
Add the acid type and corresponding volume shown in Table 7 in turn, and digest according to the digestion conditions of procedure a (MC and MF digestion system) and procedure B (Mg and Mi digestion system) in Table 8
After digestion, cool to room temperature, transfer the digestion solution to a 50 ml Teflon beaker, heat the acid with an electric hot plate, control the temperature at 180 ℃, and steam until the solution is viscous (pay attention to prevent drying)
Remove the polytetrafluoroethylene beaker, cool it slightly, add 0
5 ml nitric acid, warm it to dissolve the soluble residue, transfer it to a 50
0 ml colorimetric tube, cool it, fix the volume with ultrapure water to the marking line, shake it well and wait for measurement

 
In addition, for graphite digester , The models of supporting signs are as follows:
Renek gs-36 , GS-40   GS-48   GS type (general)
The above signs are not divided into hole diameter and hole depth