NJ high pressure digestion tank 100ml flanging hydrothermal reactor for food detection

summary:
  The sealed high-pressure digestion tank is a stainless steel container with Teflon lining inside
The stainless steel container has precision threads to compress the Teflon lining to achieve sealing effect
Polytetrafluoroethylene liner can be filled with corrosive substances such as strong acid or alkali, and the sample can be heated and dissolved under closed conditions
According to the situation of reactants, the lining can also be made of imported polytetrafluoroethylene

Product introduction:
Sealed high-pressure digestion tank, also known as sealed high-pressure digestion tank, pressure digester, pressure digestion tank, digestion tank and polytetrafluoroethylene high-pressure tank, is a closed container that can decompose insoluble substances for sample pretreatment in chemical analysis methods such as gas phase, liquid phase, plasma spectrum mass spectrometry, atomic absorption and atomic fluorescence

Application fields:
It is mainly used in food, medicine, CDC, dairy products, environmental center, agricultural products, seafood, aquatic products and other industries to detect heavy metals such as lead, chromium, cadmium, methylmercury and inorganic arsenic in tea, fruits and vegetables, grain and oil, eggs, meat, milk powder and so on

Test for compliance with sample pretreatment:
GB 5009
90-2016 determination of iron in food
GB 5009
92-2016 determination of calcium in foods
GB 5009
137-2016 determination of antimony in food
GB 5009
268-2016 determination of multi elements in food
GB 5009
269-2016 determination of talc in food
Technical parameters:

specification and model	nj-zh-5, 10, 15, 20, 25, 30, 50, 60, 100, 200, 250, 500, 1000ml, etc
composition method	one set includes: an outer tank and an inner cup
outer tank material	high quality non-magnetic stainless steel
inner cup material and temperature resistance	1 The temperature resistance of domestic PTFE is within 200 ℃ 2 TFM can withstand 230-260 ℃, has better pressure resistance and recovery, low metal element value, lead and uranium content less than 0 01ppb, and has no dissolution and precipitation (involving reagents with large gas production of hydrogen peroxide or perchloric acid, TFM material is recommended)
usage conditions	the whole set is put into the oven and can withstand 5MPa (50kg)
precautions	1 The amount of solvent for digestion depends on different experiments, generally 1 / 3 to 1 / 5 of the capacity of the inner cup 2 If perchloric acid and hydrogen peroxide are used in the experiment, the dosage should not be too much, and cold nitrification should be carried out overnight 3 Just after digestion, because the pressure inside is too high, it is easy to open when it is cooled to room temperature 4 The inner and outer tanks of the same specification are common, and the domestic or TFM tanks of the same specification are also common
supporting products	the inner cup can be equipped with an acid catcher for acid driving and digestion experiments in the later stage

sharing of art green detection cases in tea:
Reduce the sample to 300g by quartering method, and then divide it into two parts by quartering method, one is reserved (> 100g), the other is crushed into powder by pulverizer [6], accurately weigh 0
5g sample, add 8
0ml nitric acid into high-pressure digestion tank, and place it overnight
Put the high-pressure digestion tank into the oven, set the temperature at 130 ℃, keep it constant for 2h, then raise the temperature to 160 ℃ for 4H
After the digestion is completely cooled, open the tank and put the digestion inner tank on the 120 ℃ acid driving instrument to drive the acid to about 1 ml of solution
After cooling, transfer it to a 25 ml colorimetric tube, wash the digestion tank with a little deionized water, incorporate the washing solution into the colorimetric tube, fix the volume to the scale, shake well for measurement

Soil digestion case sharing:
The first step: nitric acid + hydrofluoric acid 160 ℃ digestion for 6 hours;
Step 2: open the high-pressure tank and add perchloric acid to drive the acid until white smoke is emitted and then cool it

Step 3: add hydrochloric acid, drive the acid until white smoke appears, and then cool to constant volume
Pretreatment of soil total content determination & mdash& mdash; High pressure digestion
1、  Cleaning digestion tank: after removing solid impurities, soak it in dilute acid overnight, wash it with deionized water for 7 times, and dry it for use

2、  Sample weighing: accurately weigh about 0
1g of sample to 0
001g
3、  4ml of GR nitric acid, 1ml of perchloric acid and 1
5ml of hydrofluoric acid were added respectively, covered, and pre digested at room temperature for 4 hours
4、  When the pre digestion time is up, add the coat, put it into the oven and bake it at 180 ℃ for 9 hours

5、  After cooling, transfer the solution to a polyethylene bottle and weigh it with ultrapure water to about 50g, accurate to 0
01g

Detection of sea fish meal:
The capacity test plan requires the laboratory to detect the content of total mercury and total arsenic in sea fish powder according to daily testing procedures and methods
For the determination of total mercury, it is suggested that the direct mercury analyzer method should be selected first, followed by inductively coupled plasma mass spectrometry and atomic fluorescence spectrometry; If atomic fluorescence spectrometry is selected for detection, microwave digestion is not recommended for sample pretreatment
For the determination of total arsenic, inductively coupled plasma mass spectrometry is recommended, followed by atomic fluorescence spectrometry; When atomic fluorescence spectrometry is used, wet digestion or dry digestion is recommended for sample pretreatment
It is suggested to do a good job in quality monitoring
Qualified units can consider using the reference material (quality control sample) of marine fish matrix for quality monitoring

working principle:
The high-pressure digestion tank uses the strong acid or alkali in the tank and the closed environment of high temperature and high pressure to achieve the purpose of rapid digestion of insoluble substances
It is a powerful assistant for digestion of samples when determining trace elements and trace elements
Sample pretreatment digestion of heavy metals, agricultural residues, food, sludge, rare earth, aquatic products, organic matter, etc

Product features:
1
Good sealing: concave convex tenon groove design of inner cup of high-pressure digestion tank, The sharp bottom of the inner cup cover is designed to facilitate sample collection after the experiment;
2
Safety: special design, fine workmanship, vent hole on the top of the cup, high safety factor, even if the temperature is out of control, the inner cup will only deform and the outer tank will not be damaged;
3、  It has high digestion efficiency and strong ability, and can digest many samples that are difficult to be digested by traditional methods;
4、  The element value of the inner cup is low, which improves the accuracy and precision of analysis, reduces the working intensity and environmental pollution;
5、  The inner cup / outer tank is numbered in sequence to facilitate equal opportunity use;
6、  Low cost and easy to use
Little investment in the early and late stages, easy operation, almost no training for operators before use, and simple maintenance;
7、  The inner cup can be made of imported polytetrafluoroethylene (material of inner tank of microwave instrument), which is resistant to penetration, deformation and temperature

8、  The internal and external tanks are made of preferred materials, with many years of production experience, recognized by more than 800 users and guaranteed quality

High pressure digestion method is recognized as standard method by relevant departments in China, such as GB / t5009, GB / t14962, GB / t6609, GB / t11914, GB / t17378 and Sn / t2004 1、2— 2005, Sn / T 1634-2005, etc
AOAC of the United States also stipulates that this method is the sample standard decomposition method for the determination of as, CD, Hg, Pb, Se, Zn and other elements

method	benefits	limitations
high pressure digestion	safe, less initial investment, simple equipment, easy operation, less consumption of samples and reagents, low value, avoiding contamination, safe and complete sample processing, high accuracy, and can process samples in large quantities	the sample processing cycle is slightly longer, the temperature and pressure can not be controlled, and the appearance is simple
normal temperature digestion method	small input, simple equipment, easy operation, large reagent consumption, general accuracy, short working cycle and large batch processing of samples	it is easy to stain, pollute the environment, damage the health of operators, poor precision, slightly more reagent consumption, and limited to some insoluble samples
microwave digestion	it is safe, can control temperature and pressure, high efficiency in small batch, small amount of samples and reagents, low value, avoid contamination, high accuracy and high intelligence	large investment in the early and late stages, high requirements for operators, limitations on some samples, large loss of Cr and Pb, incomplete digestion, low working temperature, and high temperature and high pressure at the same time