Nj-pfa digestion tube PFA translucent digestion cup imported material digestion tube Teflon sample tube

Overview of nj-zh digestion tube
Brand: Nanjing binzhenghong
Model: nj-zh
Graphite digester equipped with digestion tube is one of the direct, effective and economical sample pretreatment methods for elemental analysis
With the technical improvement and development of laboratory equipment, the graphite digestion instrument equipped with digestion tube is gradually favored by more digestion laboratory personnel because of its advantages of mass processing, high intelligence, efficient wrapped digestion, good temperature uniformity and safer atmospheric digestion

Digestion tube is also called digestion tube, digestion cup and Teflon sample tube
It can replace glass and plastic tubes with stable performance and fall resistance
At present, our commonly used digestion tube material is tetrafluoro or PFA
Comparison of digestion tube characteristics:

product features	Teflon digestion tube (PTFE, PTFE, Teflon)	PFA digestion tube (Teflon, soluble polytetrafluoroethylene)
transparency	white opaque	it is transparent, the liquid level can be observed, and the tube body can be used as a scale line to digest and fix the volume It can be operated on a sample tube to save time
material , material	polytetrafluoroethylene, the tube body has no adsorption and non stick, which is convenient for experimental cleaning, without black spots, yellow spots, cracks and other defects	PFA material is imported, corrosion-resistant, with low dissolution and precipitation characteristics and longer service life
resistant , temperature	Room temperature to 250 ℃ (non airtight)	Room temperature to 260 ℃ (non airtight)
pipe size	external diameter 28-29mm, total height 135mm, volume 50-60ml, customizable
lid design	threaded cover, reflux cover, handle cover, integrated 2 cover, horn cover and flat cover can be designed
number display	the cover and body can be numbered uniformly by laser and can not be lost for a long time, which is convenient for sample recording and not confused
adaptive instrument	leibertec ed, EHD, digiblock's tf-36 / 16 series, gerdana ds-360 series, Deena, Thomas Cain, pritec st-60, Ruike, Tianjin tuozhiming, Haineng, Dingtai, ople and other instruments
precautions	the above temperature resistance refers to the case that the cover is not sealed If the experiment requires high temperature and the cover is threaded, we can design the exhaust hole
pipe cleaning	after the experiment, clean it in time, soak it in weak acid, use a soft brush on the inner wall to avoid scratches, wipe the liquid on the inner and outer walls dry, and steam or dry it on the digestion instrument if necessary, which will interfere with the next group of experiments
preferential scheme	in addition to supporting other brands of instruments, the digestion tube will be offered a discount if it is equipped with our graphite digestion instrument, especially the 48 hole graphite digestion instrument Under normal circumstances, the size of our digestion instrument is: diameter x depth: 31x100mm

application fields
Environmental monitoring: sewage, drinking water, sludge, mineral mud, sewage, soil, etc
Inspection of food and agricultural products: milk powder, fish, vegetables, plants, chemical fertilizer, non-staple food, etc
Quality control of consumer goods: cosmetics, industrial products, etc
Scientific research: experimental analysis, project development, etc
CDC: biological samples, human hair, blood, urine, nails, etc
Digestion application standard
  EPA method for environmental samples: 3010a, 3010b, 3050b, 3060, etc
(soil, sediment, sludge, waste gas)
  Soil treatment methods: GB / T17138-1997, GB / t22105 1-2008、GB/T22105
2-2008, etc
  EPA methods for water treatment: 200
2, 200
7, 200
8, 200
9, 245
1, etc
  EPA method for mercury analysis: 7470A, 7471, 245
1, etc
  Food processing method: GB / t5009 11-2003, etc
  Coating treatment method: GB / t22788-2006, etc
  Processing methods of electronic products: SJ / t1365-2006, etc
Applicable standards for solid waste
1
HJ 787-2016 determination of lead and cadmium in solid waste
2
HJ 786-201 6 Determination of lead, zinc and cadmium in solid waste
3
HJ 781-2016 determination of 22 metal elements in solid waste
4
HJ 750-201 5 Determination of total chromium in solid waste
5
HJ 751-2015 determination of nickel and copper in solid waste
Applicable food standards
GB/T 5009
11-2014 determination of total and inorganic in food
GB/T 5009
17-2014 determination of total and organic in food
Applicable standards for air and waste gas
HJ 777-2015 determination of metal elements in particulate matter of air and waste gas
HJ 539-2015 determination of lead in ambient air
Case sharing:
1、 National standard version ---- graphite digester + tetra acid wet digestion + PTFE tetrafluoro digestion tube with screw cap
1
Accurately weigh and take 0
5000 g± of air dried soil; 0
0010 g

2
2-3 ml HF, 2-4 ml aqua regia, capped heating tube, temperature 110-120 ℃ for 4H
3
4-2 ml aqua regia, 2 ml perchloric acid, covered with heating tube, temperature 120 ℃ for 4H
4
The temperature of the cover opening tube is 150 ~ 175 ℃, smoke and drive out the acid
Try to drive the solution to near dry (unclear) and lower the temperature slightly
Batch Supplement 2 ml nitric acid, smoke at 150 ~ 175 ℃ to drive out the acid, and do not boil it dry
Repeat 2-3 times until the tube is clean, flexible, clear in color, white, light yellow liquid or orange homogeneous
Colloidal solid
It usually takes 6h
If perchloric acid is added for black and turbid, the amount of acid added in batch is 0
5-1 ml
Do not add hydrofluoric acid easily
All acid supplements must be added to all samples in batches! Include blank!!
6
Before leaving the pot (120 ℃), add 2 ml nitric acid and 10 ml pure water, cover and re dissolve for 4 hours, and transfer to 50 ml

2、 Environmental field
Soil digestion
Instrument: ed36 Teflon digestion tube
Reagent: 1 Hydrochloric acid (HCl): & Rho= 1
19g/ml, superior pure
2
Nitric acid (HNO3): &rho= 1
42g/ml, superior pure
3
Hydrofluoric acid (HF): &rho= 1
49g/mL
4
Perchloric acid (HClO4): &rho= 1
68g/ml, superior pure
Step: 1 Weigh 0
2-0
5g of soil sample into Teflon digestion tube, add 10ml HCl,
Insert into the digestion hole

2
Set the digester temperature to 100 ℃, heat it to a small amount of sample, and then remove it for cooling

3
Add 5ml HNO3 , 5mL HF、3mL HClO 4  ， Stamp

4
Set the digester temperature to 170 ℃, heat up for about 1H, and open the cover after cooling

5
Continue to heat the volatile silicon, raise the temperature to 200 ℃, and remove the coolant after steaming to a small amount with thick white smoke
The body is transparent

3、 Digestion of sewage
Instrument: ed36 polypropylene digestion tube or glass digestion tube
Reagent:
1
Nitric acid (HNO 3): &rho= 1
42g/ml, superior pure
2
Sulfuric acid (H 2SO 4): &rho= 1
84g/ml, analytical purity
3
Potassium permanganate (KMnO 4 ): 5%
Steps:
1
Take 20ml sample (or appropriate amount) into polypropylene digestion tube

2
Add 0
5ml nitric acid HNO 3 and 1ml sulfuric acid H 2SO 4, and evenly mix the samples

3
Add 3ml5% potassium permanganate KMnO 4 solution and place it for 15 minutes
If the sample fades from purple or brown
Color, add 2 ml of potassium permanganate KMnO 4 solution

4
Place the cover on the digestion tube and leave a gap to allow a little pressure, but don't let too much pressure
The smoke of the

5
Heat and reflux at 95 ℃ for 2 hours and keep it from boiling

6
After cooling, the sample is digested

 
 
 
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