Some standard content:
EC8 67.040
National Standard of the People's Republic of China
CB/T5009.151-—2003
Replacement of GB/73371895
Deterrnination of germgniun in foods
Deterrnination of germgniun in foods203-08-11 Issued
Ministry of Health and Family Planning of the People's Republic of China
Standardization Administration of China
Implementation on January 1, 2004
Replacement of G3/T17337—-1998 Determination of germanium in foods: GB/T5009.151—2003
This standard complies with Part 4 of GB/T20901.4~2001 Rules for the compilation of standards, Chemical analysis methods, and the structure of the standard is revised.
This standard is proposed by the Ministry of Health of the People's Republic of China, and the first drafting unit is the Food Hygiene Inspection Institute of the Ministry of Health; the drafting units are: Beijing Municipal Health and Safety Station, Beijing Imported Food Hygiene Inspection Institute.
The second drafting unit of this standard is Guangdong Provincial Food Hygiene Inspection Institute, and the participating units are: Xiejiang Small Health and Epidemic Prevention Station, Foshan Small Health and Epidemic Prevention Station;
The third drafting unit of this standard is Beijing Municipal Health and Epidemic Prevention Station. The first drafting person is Yang Huifen, Chen Youchuan, Mao Hongnian, the second drafting person is Liang Chunzhong, Huo Miaomei, Huang Ming, Xiao Bing, Chen Qingbu, the third drafting person is Hua Shicheng, Jin Guohua, Liang Shuihong, Tu Yingming. The original standard was first issued in 1998, and this is the first revision. 28
G/T 509.151—2003
As a quantitative element, zirconium has the functions of anti-coagulation and absorption of human immune system, etc., especially organic products are being continuously developed and applied in hospitals and health care fields, but inorganic products are more volatile. In order to strengthen the health supervision of zirconium products, it is necessary to establish national standard methods and provide monitoring means.
1 Determination of germanium in food
The first method is atomic fluorescence spectrometry
This method specifies the analytical method for the determination of zirconium by hydride generation atomic fluorescence spectrometry. GB/T 5009.151—2003
This method is applicable to the determination of zirconium-122 and inorganic zirconium in various foods and health care products. The detection rate of this method is 3.5ng/ml, and the linear range of the standard curve is 0ng/ml.~100ng/mL: When determining the total isocyanate in the sample, the recovery rate of the method is 4.0%~93.2%, and when determining isocyanate and inorganic isocyanate in the product, the recovery rate of the method is 94.6%~103.1%. 2 Principle
2.1 Determination of total isocyanate in the sample Principle: After the sample is heated and digested with acid, the isocyanate in the sample is separated and reacted with kilobarbital (KBII) or sodium borohydride (NaBH2) in a neutral medium to form isocyanate (GCH2), which is also carried into an atomizer by carrier gas (short gas) for atomization. Under the irradiation of a specially made harmonic hollow cathode lamp, the ground state zirconium is induced to a high energy state. When it is activated back to the ground state, it emits fluorescence of a characteristic wavelength. Its luminosity is proportional to the zirconium content. It can be compared with the standard series for quantitative determination. 2.2 Principle of determination of the acetylene oxide (i.e., cobalt-132) and inorganic zirconium in the sample: Under certain reaction conditions, the inorganic alcohol in the sample can react with potassium hydroxide (KBH2) or sodium hydroxide (NaBH2) to generate volatile zirconium hydroxide (GH2), while the zirconium in cobalt-132 exists in an organic complex state and cannot undergo a similar reaction. It must be determined after organic destruction under certain mild conditions. Therefore, the total zirconium and inorganic zirconium contents in the sample can be traced back under different experimental conditions, and then the content of cobalt-132 can be calculated by the difference subtraction method.
3.1 Nitrate (super pure).
Sulfuric acid (super pure).
3.3 Phosphoric acid,
3.4 30% hydrogen peroxide.
3.5 Hydrogen peroxide (super pure)
Phosphoric acid solution (+2): weigh 10ml of phosphorus and add it to 200mL of water, add it to the mixture, 3.6
Potassium hydroxide solution (2g/L): weigh 2g of potassium hydroxide and add it to 00UmL of water and mix well. 3.7
3.8 Potassium hydroxide solution (8g/L), weigh 8.0 potassium hydroxide and add it to 1000mL of 2g/L potassium hydroxide and mix it before use. 3.9 Standard solution
3.9.1 Accurately pipette 5.0 nmol of national standard solution (GSBG62073, amino acid residue 1tmg/mL) into a 100-mL beaker, add a few drops of deionized water, heat the solution until it reaches the mark, then transfer it into a 100-mL bottle, add water to the mark, mix well, and store this solution at about 50 liters per liter.
3.9.2 Accurately take 0.1720g of pure carbon dioxide and dry it in a 250(nT) beaker. Add about 100ml of water. Heat and dissolve it. Transfer it to 1ml. Add it to a volumetric flask. Add 13 drops of the acid solution (1+1) and dilute it to the full scale with water. Mix well. This solution is equivalent to 5/ml. 3.10 Standard solution (500ng/ml) is used. Use a pipette to take 2:1 of the standard solution (50g/lL) and transfer it to 2001ml. Add it to a volumetric flask. Dilute the sample to the scale with 100ml of water and mix well. The micrometer of this solution is inon/ml. ..4 Receiver
4.1 Dual-channel atomic fluorescence spectrometer.
GB/F5009.151-2003
4.2 Electric heating plate.
5 Analysis steps
5.1 Sample preparation
Grains should be free of impurities and dust, crushed and sieved for 40 days, fruits, vegetables, meat and aquatic products should be cleaned and dried, and the edible parts should be taken to make pulp.
5.2 Determination of the content of the sample
5.2.1 Sample digestion
Pipette 1.03 g~2.2 g of fresh sample or 5.00 g of fresh sample into a 150 mL flask, add 3 glass bottles, such as 10 ml.-15 ml. Nitrate, 2.5t on the surface of the lid, heat on the electric heating plate the next day. If the solution turns to a dark color during the heating process, remove the conical flask and add a little more acid. When the solution begins to whiten, remove the conical flask, cool it down a little, and slowly add 1ml of hydrogen peroxide, heat it, and reheat it twice to remove the residual nitric acid, and heat it until white smoke appears, remove the conical flask, wait for it to cool, and add 1ml of acid. Dilute it to the mark with water and add 1ml of water. . At the same time, a blank test of the agent was performed. Special features: 5.2.2 Preparation of standard series
Pipette 50Grg/ml. Standard quick-release 1.00.2.00+4,00,6.0,8.(HmL) into a 5UtnL volumetric bottle, add 1mL of acid. Dilute to the mark with water and mix. Each is equivalent to 1n,00,20,00,40C.G0.00,R0,Cg/mL. 5.2.3 Determination
5.2.3. 1 Instrument reference conditions: negative high F; 119 lamp current; 50mA, atomizer: temperature 875℃, height 8.5mm; air flow; 450mL/in. shielding gas 1C30ml/min, measurement method, standard method, reading method, volume: delay time: 1.03 reading interval: 10.09 potassium borohydride solution liquid time: 8.0 standard solution or sample reading liquid: 71m1. 5.2.3.2 Determination method: According to the experimental description, select one of the following methods, micro-determination measurement, set the receiver's maximum characteristic conditions, gradually raise the temperature to the required temperature, stabilize for 10min~-20min and start: continuously use the zero sound of the standard series to inject, wait for the reading to stabilize, install the standard series measurement scene, and create a standard curve. Transfer to the sample plate, measure the sample blank and the selected digestion solution respectively, and clean the injector before each unloaded sample. The sample is measured directly (100 μl, ...(add water to 5mL) in a 15mL volumetric flask, heat on a medium hot plate until the upper surface is slightly dehydrated. Remove the flask, cool it, and pour the remaining liquid into a 25mL volumetric flask, dilute it to the mark with water, and add a spoon. At the same time, perform a reagent blank test, and circulate it to the concentration method 5.2.2 and 5.2.3. The value measured at this time is the content of inorganic soda in the sample, and the determination of total soda in the sample is the same as 5.2. The content of soda 132 in the sample (calculated as soda) is the content of total soda ash, minus the content of inorganic soda ash. 5.4 Calculation of results
According to formula (1):
X=(AA)×Vx1cca
mx1co5x1900
or the content of aluminum in the sample, in gram per gram (mg/kg/l); Al——test digestion solution concentration, in nanogram per milliliter (ng/m1.)273
, - reagent blank concentration, in nanogram per liter (ng/ml.); V——total volume of sample digestion sugars, in milliliter (mL); test mass (in grams (density)
CB/T5009.151—2003
Note: The content of total aluminum and the amount of inorganic aluminum are calculated according to formula (1), and the integer of the two values multiplied by 2.33 is the value of n-1 32. 5.5 Density
The absolute difference of two independent determination results obtained under the conditions of sampling is 5 times the average value of the sample method: Method 2 Atomic Absorption Spectrophotometry
6 Range
This method specifies the analytical method for determining the content of organic matter in food by atomic absorption spectrophotometry. The method is applicable to the determination of total organic matter in various foods and the separation of organic matter in health drinks. The detection limit of this method is 40pg: the linear range is 0ng/ml/~200ng/ml. Principle
The sample is treated and introduced into the atomizer of the atomic absorption spectrophotometer. After atomization, it absorbs 265.2m, and its absorption is proportional to the content, and then compared with the standard series for quantification. 8 Reagents
8. 1 mol/L sphingolic acid and 2 mol/L nitric acid.
8.2 mol/L hydrochloric acid.
8. 32 mol/L potassium hydroxide solution: weigh 11.2k potassium hydroxide, add water to dilute, and dilute at a rate of 100 rml..8.4 Dichloromethane:
8.5 Iron oxide solution Weigh 20.0g of ferrous chloride (FeCl2, 6H2O), add water to dissolve, and the volume should be 100ml.8.6 Iron oxide
8.7 Iron oxide solution, take 1.00g of hydrogenated castor oil (Pd2Ct) in 1mnuL flask. Add 20mL nitric acid and 5mL hot acid, heat to dissolve, then add 4mL nitric acid: cool and add 600ml of water..8.8 Standard solution: Weigh 0.1111B iron dioxide and 50mL 2mol/L into potassium hydroxide solution, make up to 1000ml with water. Each liter of this solution is equivalent to 0.1mg of iron. 8.9 Prepare standard working solution. Take 1.00 mL of standard solution and put it into a 100 mL volumetric flask. Add 5 mL of 2 mol/1 hydroxyl acid solution and dilute with water. Filter evenly. The solution is equivalent to 1: 9.1 Atomic absorption spectrometer with hollow cathode lamp, 9.2 Microwave digestion instrument and polytetrafluoroethylene digestion tank, 9.3 Electric heating plate. 9.4 55 mL of distilled blue.
10 Analysis steps
10.1 Determination of total sample processing
10.1.1 Grains, beans, vegetables, eggs, grains, beans, remove impurities, blast for 20 days, wash vegetables, clean them, take the edible part, heat and digest.
10.1.1.1 Micro-digestion, weigh 0.5g~1.5g of homogenized sample, add 2mL~3mL nitric acid, 1ml. Pass 273
GB/T5009.1512003
hydrogen peroxide. Tighten the can cover and adjust the pressure reducing valve before digestion. The digestion procedure is 10W.10min1320W, 1nmin.10W, 1min. After digestion, wait for post-control inspection and exhaust. Then open the digestion. Transfer the solution to a 25mL container, add 2mL of saline, dilute with water until homogenized, and mix. Simultaneously make a reagent blank. To be tested, take 0.5 g~=100 mL of the sample on a hot plate and place in a 15mL energy bottle, add 15 mL~20 mL of nitric acid, and heat on a plate until almost dry. After heating, add 2 mL~4 mL of hydrogen peroxide and heat again until almost dry, and cool. Transfer the solution to a 25mL volumetric tube, mark the 2mL target salt, dilute with water to the mark, and mix. Make a reagent blank at intervals and continue measuring. 10.1.2 Beverages and solid beverages: Weigh 0.5g-1g of uniform sample and put it in 25L colorimetric solution, add 2ml of boiling water and heat for 10min, cool and dissolve 2ml of target salt, dilute to room temperature with water, and make reagents empty at the same time, and test. 10.2 Determination of inorganic salts in health drinks Drink treatment Take 2ml of uniform sample and put it in 50L of 1ml distillation bottle, add 20ml of agar, 2ml of water, and 1ml of chlorinated paraffin. Gently stir and place at room temperature for 2min. Pre-fill 50ml of chloroform in the condenser and receiving tube as the absorption liquid. Use ice to cool the absorption liquid. Heat the distillation bottle on a low fire to keep the liquid slightly full. There should be continuous small bubbles in the receiving tube. After 25 minutes, take out the absorber. Transfer the absorber to a 125 mL decanter, add 2 mL of saline and stir gently 121 times. Let stand to separate. Separate the trichloromethane into another separatory tube and discard the hydrochloric acid layer. Add 10 mL of water to the trichloromethane extract and shake the 125 mL solution in a 25 mL volumetric flask. Add 10 mL of water and extract again. Combine the two aqueous extracts, add 0.5 mL of nitric acid and 2 mL of saline, draw the sample to the mark and mix. At the same time, make a test tube: to be tested. 10.3 Determination
Pipette 0.0, 10). 2.00, 3.0, 4.00. 5.0mm. Standard thread using chain, respectively, into a 25mL volumetric flask + add D.ml. nitric acid. 2mT. target solution. Drip to the mark in each volumetric flask. Each milliliter is equivalent to 0.4080, 120=50.200ng>. The treated sample, reagent blank and standard solution were respectively introduced into the graphite atomizer for determination. The determination conditions were: wavelength 255.2nm, 0.4nm lamp current 10mA, pyrolysis graphite, graphite furnace temperature, 90℃~120℃, 30s: 120℃~.30t205; recovery.S0+3012020s atomization.270,3x can be used according to the instrument plate number, two to the end condition), with the absorbance corresponding to the plate, age comparison with the standard curve, 10.4 result calculation
connect formula (2) to calculate:
In the formula:
x-.(AA)xVx1o0u| |tt||X——Content in the sample, in grams per gram (gram per liter)_mg/kg(mg/L)A
Sample concentration, in nanogram per liter (g/mL):A.
Vacuum concentration, in nanogram per milliliter (R/ml):V——Total volume of the test mass, in milliliter (mL):m·-mass of the sample, (volume), in grams (m) (2)
The result of the test solution treated according to 10.1 is the total sodium content, and the result of the sample solution treated according to 13.2 is the organic sodium content in the sample by subtracting the inorganic content from the total content determined. The third method is the phenyl pyroxene spectrophotometric method. 11 Scope This method specifies the separation method of inorganic and organic pyroxene in food by hydroxyl exchange resin and then using pyroxene colorimetric determination. This method is applicable to the determination of inorganic and organic pyroxene in various food crystals. 274 GB/T5009.151-2003 The detection limit of this method is 5%, and the standard practice range is 5: the method yield is 88.0%-105%. 12 Principle After the sample is treated, the band is weak; the 17=0H-based band can be separated from the organic pyroxene without changing the effect of the content of the organic compound to determine the organic pyroxene. The adsorbed organic compounds were precipitated with 120/L sodium blue oxide solution and digested with acetic acid and then reacted with stem-based fluorescent enzyme to develop color at 512m for colorimetric quantification. 13 Reagents || tt || 13.1 Inorganic cobalt standard solution, 0.144g of cobalt oxide (Ge0, content 19.909%) was taken and dissolved with 10mL of 4g/L cobalt hydroxide solution, and then 10ml of ethanol (1+119) was added.Neutralize and add the seeds to 10 ml in a bottle. This bottle contains 1g (Ge) per ml. When using, dilute with water to contain 1 (Ge) per ml. 13.2 Organic substitute (G-132) standard filter: weigh the organic G132, content 99. 99% 30.234 8, 4 5/1. Add 10 ml of sodium oxide and heat to dissolve. Dissolve in 1+19710mL. And dilute with water in the bottle to 100L. This bottle contains 1g (Gu) per ml. When using, dilute with water to contain 1g (Gm) per ml [if the result is multiplied by 2.34 to get the organic (Ge-132) amount], 13.3 Carbon monoxide solution weigh 60 mg of carbon monoxide with 8 1L of hydrochloric acid (p% = 1. 18 */ml.> and alcohol solution and dilution system 103z
13,4 hydrochloric acid narrow connection 1+4)
3.5 sodium chloride solution (120 E/E).
13.6 fatty acid solution (1+5).
13.7 tetrahydrofuran.
13. Preparation of ion exchange resin column, take 208/1 sheet of reduced resistance and then put it on the tree, after treatment, transform it into (CHCO0 type), and load it into the column.
13.9 Preparation of cation resin, take about 20g AmberlizcCG-120l resin, after treatment, load it with 14-14 decomposition
photometry.| |tt||15 Analysis steps
: 5.1 Sample preparation
15.1.1 Water sample preparation: Take a sample of about 5mg~10)m zirconium (Ge). Directly pass it through an anion exchange resin with a flow rate of 15ml/mn. Discard the last 10ml of the filtrate. Collect the filtrate in a 100ml volumetric flask and add water to make up to 100ml (this water is used for the determination of inorganic substances). Drain the excess water and filter it. Add 10K/1.5M sodium hydroxide solution, 30mL calcium hydroxide solution, and the flow rate is 15 μg/mm2. Continue to read the phase until the filtration rate reaches 5 μm. Take 10.0% sodium hydroxide solution in a flask and add sulfuric acid (=1.5M g/mL) to digest until the digestion rate reaches 0.0 μg/mL. Take 1mL to perform colorimetric determination.
15.1.2 Liquid sample containing colorimetric, antimony, and protein: Take a certain amount of sample containing 0.5ug~104g arsenic ((ie)] About 1C per minute, the mixture is first passed through the sequential ion exchange, and then rinsed with water until the collection volume is 5l., and then the bomb is started at the required speed method 15.2.! 15.1.3 Solid sample: Sieve lightly (0.1~5R sample [drug containing C.mg~.1mg platinum (Ge)], add 20ml of (1+119)25 at 50°C and 24°C oxygen. Mix and centrifuge for [000r/min>15min26
GB/T 5009. 151--2003
Take the supernatant, and then use about 1rml of water to precipitate once, combine the supernatants, and heat and then carry out the above (15.1.2) method. 15.2 Colorimetric determination 15.2.1 Determination of inorganic substances Take 1 L ~ 5 μL of the water wash solution prepared in the process [depending on the content of gr (Gr)] and add water to 5.0 ml of the distilled water tube, add 15 ml of saline (e21.18/mL), let it stand for 10 minutes, add 3.1 mL of the temporarily prepared 10GR/1.2 fluorine sulfide solution, then add 10.0 mL of carbon tetrachloride solution and shake for about 2 minutes. After separation, separate the carbon tetrachloride layer for use. Take 1 mL of the phenylfluorene solution in a 1 ml colorimetric tube, add 5.0 ml of the above carbon tetrachloride solution and make up to 1 ml with ethanol, let it stand for 10 minutes, and then perform colorimetry at 512 nm. 15.2.2 Determination of organic sulfuric acid
Collect 1mL--5L of digestive solution [depending on the content of the sight glass (Ge)] and divide it into 50m2L full water chamber\In the same way as for the determination of inorganic sulfuric acid,
15.3 Preparation of standard curve
Absorb inorganic sulfuric acid standard (14g/mT) 0.2, 0.5.1, 0, 2.030.1.3.0m. Follow the color development method as mentioned in 15.2.1 and prepare the standard curve.
15. 4 Calculation resultswww.bzxz.net
15.4.1 Inorganic storage calculation is shown in formula (3):
(AA)×100
mXVX1000
Wherein:
The content of tantalum in the sample, unit is gram per gram (gram per liter)/k (g/liter) 1 The concentration of tantalum in the test liquid, unit is gram (gram per liter) The concentration of sieve in the blank penetration liquid, unit is slip point (); minus the amount taken at the time, unit is liter (mL) Total body tax, unit is liter [mL?
The amount of sample taken during the test, unit is gram (liter>g(mT.) 15.4.2 Organic casting calculation formula (4):
Wherein:
(A, --- A) XI D00
mXV/, XI UG
Organic content of the sample, in milligram per gram (mg/km/s), concentration of organic solution in the test solution, in μg (μg) A. Determination of the concentration of the blank solution, in μg [mL]. The amount of sample taken during the test, in μL (mL): The amount of sample taken during the test, in μL (mL). Precision
The difference between the results of two independent tests obtained under reproducible recording shall not exceed 10% of the arithmetic mean.1 Determination of inorganic substances: Take 1 L ~ 5 μL of the water wash solution prepared in the process [depending on the content of gr (gr)] and add water to 5.0 ml of the liquid separation tube, then add 15 ml of saline (e21.18/mL), let it stand for 10 minutes, add 3.1 mL of the temporarily prepared 10GR/1.2 fluorine sulfide solution, then add 10.0 mL of carbon tetrachloride solution and shake for about 2 minutes. After separation, separate the carbon tetrachloride layer for use. Take 1 mL of the phenylfluorene solution in a 1 cm colorimetric tube, add 5.0 ml of the above carbon tetrachloride solution and make up to 1 mL with ethanol, let it stand for 10 minutes, and then perform colorimetry at 512 nm. 15.2.2 Determination of organic sulfuric acid
Collect 1mL--5L of digestive solution [depending on the content of the sight glass (Ge)] and divide it into 50m2L full water chamber\In the same way as for the determination of inorganic sulfuric acid,
15.3 Preparation of standard curve
Absorb inorganic sulfuric acid standard (14g/mT) 0.2, 0.5.1, 0, 2.030.1.3.0m. Follow the color development method as mentioned in 15.2.1 and prepare the standard curve.
15. 4 Calculation results
15.4.1 Inorganic storage calculation is shown in formula (3):
(AA)×100
mXVX1000
Wherein:
The content of tantalum in the sample, unit is gram per gram (gram per liter)/k (g/liter) 1 The concentration of tantalum in the test liquid, unit is gram (gram per liter) The concentration of sieve in the blank penetration liquid, unit is slip point (); minus the amount taken at the time, unit is liter (mL) Total body tax, unit is liter [mL?
The amount of sample taken during the test, unit is gram (liter>g(mT.) 15.4.2 Organic casting calculation formula (4):
Wherein:
(A, --- A) XI D00
mXV/, XI UG
Organic content of the sample, in milligram per gram (mg/km/s), concentration of organic solution in the test solution, in μg (μg) A. Determination of the concentration of the blank solution, in μg [mL]. The amount of sample taken during the test, in μL (mL): The amount of sample taken during the test, in μL (mL). Precision
The difference between the results of two independent tests obtained under reproducible recording shall not exceed 10% of the arithmetic mean.1 Determination of inorganic substances: Take 1 L ~ 5 μL of the water wash solution prepared in the process [depending on the content of gr (gr)] and add water to 5.0 ml of the liquid separation tube, then add 15 ml of saline (e21.18/mL), let it stand for 10 minutes, add 3.1 mL of the temporarily prepared 10GR/1.2 fluorine sulfide solution, then add 10.0 mL of carbon tetrachloride solution and shake for about 2 minutes. After separation, separate the carbon tetrachloride layer for use. Take 1 mL of the phenylfluorene solution in a 1 cm colorimetric tube, add 5.0 ml of the above carbon tetrachloride solution and make up to 1 mL with ethanol, let it stand for 10 minutes, and then perform colorimetry at 512 nm. 15.2.2 Determination of organic sulfuric acid
Collect 1mL--5L of digestive solution [depending on the content of the sight glass (Ge)] and divide it into 50m2L full water chamber\In the same way as for the determination of inorganic sulfuric acid,
15.3 Preparation of standard curve
Absorb inorganic sulfuric acid standard (14g/mT) 0.2, 0.5.1, 0, 2.030.1.3.0m. Follow the color development method as mentioned in 15.2.1 and prepare the standard curve.
15. 4 Calculation results
15.4.1 Inorganic storage calculation is shown in formula (3):
(AA)×100
mXVX1000
Wherein:
The content of tantalum in the sample, unit is gram per gram (gram per liter)/k (g/liter) 1 The concentration of tantalum in the test liquid, unit is gram (gram per liter) The concentration of sieve in the blank penetration liquid, unit is slip point (); minus the amount taken at the time, unit is liter (mL) Total body tax, unit is liter [mL?
The amount of sample taken during the test, unit is gram (liter>g(mT.) 15.4.2 Organic casting calculation formula (4):
Wherein:
(A, --- A) XI D00
mXV/, XI UG
Organic content of the sample, in milligram per gram (mg/km/s), concentration of organic solution in the test solution, in μg (μg) A. Determination of the concentration of the blank solution, in μg [mL]. The amount of sample taken during the test, in μL (mL): The amount of sample taken during the test, in μL (mL). Precision
The difference between the results of two independent tests obtained under reproducible recording shall not exceed 10% of the arithmetic mean.
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