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GB 25586-2010: National food safety standards of food additives bicarbonate, sodium (sodium sesquicarbonate)
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National food safety standards of food additives bicarbonate, sodium (sodium sesquicarbonate)
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GB 25586-2010
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PDF similar to GB 25586-2010
Standard similar to GB 25586-2010 GB 25576 GB 25577 GB 25585 GB 25581 Basic data | Standard ID | GB 25586-2010 (GB25586-2010) | | Description (Translated English) | National food safety standards of food additives bicarbonate, sodium (sodium sesquicarbonate) | | Sector / Industry | National Standard | | Classification of Chinese Standard | X42 | | Classification of International Standard | 67.220.20 | | Word Count Estimation | 14,175 | | Date of Issue | 2010-12-21 | | Date of Implementation | 2011-02-21 | | Regulation (derived from) | Ministry of Health Bulletin No. 19 of 2010 | | Issuing agency(ies) | Ministry of Health of the People's Republic of China | | Summary | This Chinese standard applies to sodium carbonate, sodium bicarbonate or trona recrystallization method for the raw materials used in the production of food additive sodium bicarbonate (sodium sesquicarbonate). | GB 25586-2010: National food safety standards of food additives bicarbonate, sodium (sodium sesquicarbonate)
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National food safety standards of food additives bicarbonate, sodium (sodium sesquicarbonate)
National Food Safety Standard
Food additive sodium bicarbonate (sodium sesquicarbonate)
Issued on. 2010-12-21
2011-02-21 implementation
National Standards of People's Republic of China
People's Republic of China Ministry of Health issued
Foreword
Appendix A of this standard is a normative appendix.
National Food Safety Standard
Food additive sodium bicarbonate (sodium sesquicarbonate)
1 Scope
This standard applies to sodium carbonate, sodium bicarbonate or trona as the raw materials used in the production of recrystallization food additive sodium bicarbonate (times
Half sodium carbonate).
2 Normative references
The standard file referenced in the application of this standard is essential. For dated references, only the edition date of the note
Apply to this standard. For undated references, the latest edition (including any amendments) applies to this standard.
3 formula and relative molecular mass
Formula 3.1
Na2CO3 · NaHCO3 · 2H2O
3.2 relative molecular mass
226.03 (according to 2007 international relative atomic mass)
4. Technical Requirements
4.1 Sensory requirements. comply with Table 1.
Table 1 Sensory requirements
Project requires test methods
Color White take appropriate sample is placed in a beaker 50mL watch in natural light
Observing the color and texture. Needle-like state organization, flaky crystal or crystalline powder
4.2 Physical indicators. to comply with Table 2.
Table 2. Physical and chemical indicators
Item Index Test Method
Sodium bicarbonate (NaHCO3), w /% 35.0 ~ 38.6 Appendix A A.4
Sodium carbonate (Na2CO3), w /% 46.4 ~ 50.0 Appendix A A.5
Chloride (Cl dollars), w /% ≤ 0.3 Appendix A A.6
Water, w /% 13.8 ~ 16.7 Appendix A A.7
Iron (Fe)/(mg/kg) ≤ 20 Appendix A A.8
Heavy metals (Pb)/(mg/kg) ≤ 5 Appendix A A.9
Lead (Pb)/(mg/kg) ≤ 2 Appendix A A.10
Arsenic (As)/(mg/kg) ≤ 1 Appendix A A.11
TABLE 2 (cont.)
Item Index Test Method
Sulfate (SO4 dollars), w /% ≤ 0.02 Appendix A A.12
Clarity through test A.13 in Appendix A
Bulk density ρ/(g/mL) ≥ 0.7 Appendix A A.14
Appendix A
(Normative)
Testing method
A.1 Warning
Reagents The standard test methods used for toxic or corrosive, be careful when operating! As should be immediately splashed on the skin
Rinsed with water, severe cases should be treated immediately. Generate volatile harmful gases operations should be carried out in a fume hood.
A.2 General Provisions
The standard test methods used in the reagents and water, did not indicate when the other requirements, refer to analytically pure reagents and GB/T 6682-2008
Three water regulations. Used in the test standard titration solution, impurity standard solution, preparations and products, did not indicate when additional requirements are
Press HG/T 3696.1, HG/T 3696.2, the provisions of HG/T 3696.3 of preparation.
A.3 Identification Test
A.3.1 Identification of sodium ions
Wetting platinum wire with hydrochloric acid, colorless to burn in the flame, then dipped a little in the test solution combustion flame, the flame that is bright yellow.
Identification A.3.2 carbonate
Sample taken a little, the gas may produce hydrochloric acid solution (1 + 2), the gas is passed through the calcium hydroxide solution (3 g/L) in a white precipitate
produce.
A.4 Determination of sodium bicarbonate
A.4.1 hydrochloric acid titration (Arbitration Act)
A.4.1.1 Method summary
The sample was dissolved after adding a certain amount of sodium hydroxide standard titration solution, then add a solution of barium chloride reacted with sodium carbonate was added phenol
Phthalocyanine indicator, titrated with standard hydrochloric acid solution was titrated to the end point.
A.4.1.2 Reagents and materials
A.4.1.2.1 carbon dioxide-free water.
A.4.1.2.2 barium chloride solution. 100 g/L.
A.4.1.2.3 sodium hydroxide standard titration solution. c (NaOH) = 1 mol/L.
A.4.1.2.4 hydrochloric acid standard titration solution. c (HCl) = 1 mol/L.
A.4.1.2.5 phenolphthalein indicator solution.
A.4.1.3 analysis step
Weigh about 2 g samples, accurate to 0.000 2 g, placed in 400 mL beaker, add 200 mL of carbon dioxide-free cooling water solubility.
Accurately added 20 mL of sodium hydroxide standard titration solution and adding 100 mL of barium chloride solution, shake. Add 3 drops to 5 drops of phenolphthalein indicator solution,
Standard titration with hydrochloric acid solution was titrated to a colorless end point exactly. At the same time a blank test.
In addition to the blank test without the sample, the addition of reagents and other operations of the kind and amount (other than the standard titration solution) with the same Test.
A.4.1.4 Calculation Results
Sodium bicarbonate content of sodium bicarbonate (NaHCO3) mass fraction w1 and its value is expressed in%, according to formula (A.1) calculated as follows. []
1000) 0
1 × - = m
cMVV
((A.1)
Where.
Numerical hydrochloric acid standard titration solution volume consumed V0-- blank test, in milliliters (mL);
Numerical hydrochloric acid standard titration solution consumed V-- titration solution volume in milliliters (mL);
Accurate c-- hydrochloric acid standard titration solution concentration value in units of moles per liter (mol/L);
m-- sample mass value in grams (g);
Numerical M-- sodium bicarbonate (NaHC03) molar mass in grams per mole (g/mol) (M = 84.01).
Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 0.2%.
A.4.2 NaOH titration
A.4.2.1 Method summary
Sample of sodium bicarbonate and sodium hydroxide, according to the volume consumed by the number of sodium hydroxide, sodium bicarbonate content calculated.
A.4.2.2 Reagents and materials
A.4.2.2.1 carbon dioxide-free water.
A.4.2.2.2 sodium hydroxide standard titration solution. c (NaOH) = 1 mol/L.
A.4.2.2.3 silver nitrate solution. 100 g/L.
A.4.2.3 analysis step
Weigh about 8.4 g samples, accurate to 0.000 2 g, placed in 250 mL beaker, add 50 mL of carbon dioxide-free cooling water solubility.
With 1 mol/L sodium hydroxide standard titration solution titration, until taking a drop of test solution of silver nitrate solution was reacted with 1 drop in microtiter plates meet
When dark brown. At the same time a blank test.
In addition to the blank test without the sample, the addition of reagents and other operations of the kind and amount (other than the standard titration solution) with the same Test.
A.4.2.4 Calculation Results
Sodium bicarbonate content of sodium bicarbonate (NaHCO3) mass fraction w1 and its value is expressed in%, according to formula (A.2) calculated as follows. []
1000) 0
1 × - = m
cMVV
((A.2)
Where.
Numerical sodium hydroxide standard titration solution consumed V-- titration solution volume in milliliters (mL);
Numerical solution of sodium hydroxide standard titration blank test V0-- volume consumed in milliliters (mL);
Accurate c-- sodium hydroxide standard titration solution concentration value in units of moles per liter (mol/L);
m-- sample mass value in grams (g);
Numerical M-- sodium bicarbonate (NaHC03) molar mass in grams per mole (g/mol) (M = 84.01).
Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 0.2%.
A.5 Determination of sodium carbonate
A.5.1 Reagents and materials
A.5.1.1 hydrochloric acid standard titration solution. c (HCl) = 1 mol/L.
A.5.1.2 Bromocresol green - methyl red indicator solution.
A.5.2 Analysis step
It weighs about 2.5 g samples, accurate to 0.000 2 g, placed in 250 mL conical flask, add 50 mL of water to make it all dissolved. Dropping 10
Drops of bromocresol green - methyl red indicator solution, titration with hydrochloric acid standard titration solution to the test solution from green to dark red after boil 2 min, cold
To room temperature, with hydrochloric acid standard titration solution and continue titration to dark red for the end. At the same time a blank test.
In addition to the blank test without the sample, the addition of reagents and other operations of the kind and amount (other than the standard titration solution) with the same Test.
A.5.3 Calculation Results
Sodium content of sodium carbonate (Na2CO3) mass fraction w2 and its value is expressed in%, according to formula (A.3) Calculated.
[]
6309.0 0
1000) (
2 × - × - = wm
cMVV
w (A.3)
Where.
Numerical hydrochloric acid standard titration solution volume V-- titration solution consumed in milliliters (mL);
Numerical hydrochloric acid standard titration solution volume consumed V0-- blank test, in milliliters (mL);
Accurate c-- hydrochloric acid standard titration solution concentration value in units of moles per liter (mol/L);
m-- sample mass value in grams (g);
Numerical M-- sodium carbonate (1/2Na2CO3) molar mass in grams per mole (g/mol) (M = 53.00);
w1-- A.4 measured by the sodium bicarbonate (NaHCO3) mass fraction%;
0.6309-- sodium bicarbonate and sodium carbonate in terms of coefficients.
Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 0.2%.
A.6 Determination of chloride
A.6.1 Reagents and materials
A.6.1.1 95% ethanol.
A.6.1.2 nitric acid solution. 16.
A.6.1.3 silver nitrate solution. 17 g/L.
A.6.1.4 chloride standard solution. 1mL solution of chlorine (Cl) 0.10 mg.
Pipette 10.00 mL chloride standard solution according to HG/T 3696.2 requirements formulated and placed in 100 mL volumetric flask, dilute to the mark with water
Degree, shake.
A.6.2 Analysis step
Dissolved water to make it weighed 1.00 g ± 0.01 g sample was placed in a 50 mL beaker, adding the right amount of all transferred to a 100 mL volumetric flask
Diluted with water to the mark. With pipette 10 mL of the above test solution, placed in 50 mL colorimetric tube, add 1 mL95%
Diluted ethanol, 3 mL solution of nitric acid and 2 mL of silver nitrate solution with water to the mark, shake gently. He was allowed to stand for 10 min, under the black background
Turbidity and standard turbidity solution than the right, the resulting turbidity can not be deeper than the standard solution.
Turbidity standard solution was pipetted 3.00 mL chloride standard solution, and treated in the same sample at the same time.
A.7 Determination of moisture
Calculation results
Moisture mass fraction w4 and its value is expressed in%, according to formula (A.4) Calculated.
3214 6485.1100 wwww --- = (A.4)
Wherein
w1 - A.4 measured value of the mass fraction of sodium bicarbonate,%;
w2 - A.5 value measured carbonate mass fraction,%;
w3 - A.6 measured value of the mass fraction of chlorine,%;
1.6485-- chloro converted into coefficients of sodium chloride.
A.8 Determination of iron
A.8.1 Reagents and materials
A.8.1.1 hydrochloric acid solution. 13.
A.8.1.2 Reagents and other materials with Chapter 4 GB/T 3049-2006 of.
A.8.2 Instruments and Equipment
Spectrophotometer. with 4 cm cuvettes.
A.8.3 Analysis step
A.8.3.1 draw the curve
According to the provisions of 6.3 in 3049-2006 GB/T , using a 4 cm cuvette, draw an iron content of 10 μg ~ 100 μg curve.
A.8.3.2 Determination
Weigh about 2 g samples, accurate to 0.01 g, placed in a 150 mL beaker, was added 8 mL of hydrochloric acid. The following press GB/T 3049-2006
From the provisions of 6.4, "if necessary, add water to 60 mL" began to operate. While the same treatment the blank test solution. From the working curve
Isolated on the respective quality of the iron.
A.8.4 Calculation Results
Iron content of iron (Fe) mass fraction w5 and its value in mg/kg according to formula (A.5) Calculated.
5 10- ×
- =
mmw (A.5)
Where.
Numerical test solution iron quality m1-- isolated from the working curve, in milligrams (mg);
Numerical blank test solution of iron quality m0-- isolated from the working curve, in milligrams (mg);
m-- sample mass value in grams (g).
Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 5 mg/kg.
A.9 Determination of Heavy Metals
A.9.1 Reagents and materials
A.9.1.1 hydrochloric acid solution. 1 + 1.
A.9.1.2 Sodium hydroxide - glycerol solution;
Pipette Pipette 40 g/L of sodium hydroxide solution, 15.00 mL, was added 50 mL of water and 20 mL of glycerol, shake. (Also known as 3 g hydrogen
Sodium hydroxide was dissolved in 75 mL water, combined with 250 mL of water and 100 mL of glycerol was added, mixed).
A.9.1.3 thioacetamide solution. 40 g/L (in a brown bottle, shelf life of no more than seven days).
A.9.1.4 thioacetamide - sodium hydroxide - a mixed solution of glycerol;
Pipette pipette sodium hydroxide - glycerol solution 10.00 mL, 100 mL beaker is placed, was slowly added a solution of 2 mL thioacetamide,
Heated for 20 seconds on a water bath at about 50 ℃, immediately after cooling.
A.9.1.5 Lead standard solution. 1mL solution containing lead (Pb) 0.010 mg;
Pipette 1.00 mL of lead standard solution according to HG/T 3696.2 requirements formulated and placed in 100 mL volumetric flask, dilute with water to the mark,
Shake well. The solution is using now.
A.9.1.6 other agents with GB/T 5009.74-2003 of Chapter 3.
A.9.2 Instruments and Equipment
With GB/T 5009.74-2003 of Chapter 4.
A.9.3 Analysis step
Weigh 2.00 g ± 0.01 g sample was placed in 100 mL beaker, add 10 mL of water to dissolve, plus hydrochloric acid solution, and after adjusted acid
Of pH≈2 (precision strip test) all transferred to a 50 mL colorimetric tube, add 4 mLpH an acetate buffer solution 3.5, 4 mL
Thioacetamide - sodium hydroxide - a mixed solution of glycerol, diluted with water to the mark. After 5 min in a dark place, on white background Concept
Police, the color may not be deeper than the standard colorimetric solution.
Standard colorimetric solution is taken with a pipette 1.00 mL of lead standard solution, placed in 50 mL colorimetric tube, add 10 mL of water, add 1
Drops to 2 drops of hydrochloric acid solution, the following from the "Join 4 mLpH an acetate buffer solution 3.5" began, and treated in the same sample at the same time.
A.10 Determination of Lead
A.10.1 dithizone colorimetry (Arbitration Act)
A.10.1.1 analysis step
Weigh 5.00 g ± 0.01 g sample was placed in 100 mL beaker, add water to completely dissolve the sample, placed in a separatory funnel.
Pipette 1.00 mL of lead standard solution, placed in a separatory funnel, as a standard solution of the following according to GB/T provision 5009.75─2003
Measured.
A.10.2 atomic absorption spectrophotometry
A.10.2.1 reagents and materials
A.10.2.1.1 hydrochloric acid.
A.10.2.1.2 chloroform.
A.10.2.1.3 nitrate.
A.10.2.1.4 sodium hydroxide solution. 250 g/L.
A.10.2.1.5 Pyrrolidine dithiocarbamate (The APDC) solution. 2%.
Weigh 2 g Pyrrolidine dithiocarbamate (The APDC) was dissolved in 100 mL of water. If insoluble material filtered before use.
A.10.2.1.6 lead standard solution. 1mL solution containing lead (Pb) 0.010 mg.
Pipette 1.00 mL of lead standard solution according to HG/T 3696.2 requirements formulated and placed in 100 mL volumetric flask, dilute with water to the mark,
Shake well. The solution is using now.
A.10.2.1.7 precision pH test paper. pH0.5 ~ 5.0.
A.10.2.1.8 two Water. comply with GB/T 6682-2008 of.
A.10.2.2 instruments and equipment
A.10.2.2.1 separating funnel. 250 mL.
A.10.2.2.2 atomic absorption spectrophotometer.
A.10.2.3 analysis step
A.10.2.3.1 lead standard assay preparation and assay solutions
Accurate Pipette 2.00 mL of lead standard solution, placed in a 150 mL beaker, add 30 mL of water, 10 mL of hydrochloric acid, (surface covered dish) plus
Heat to boiling and boil 5min. Cooling, the solution was adjusted to pH 1.0 with sodium hydroxide solution to 1.5 (pH paper with a precision test). will
Solution was transferred to a separatory funnel, diluted with water to approximately 200 mL. Was added 2 mL Pyrrolidine dithiocarbamate (The APDC) solution, shake
uniform. Chloroform extracted twice, each added 20 mL, the extract (ie, organic phase) was collected in 50 mL beaker (in the hood
In) with a water bath and evaporated to dryness. 3 mL of nitric acid was added to the residue and heated nearly dry. Was added 0.5 mL of nitric acid and 10 mL of water, heating
To the remaining liquid volume of 3 mL ~ 5 mL, transferred to 10 mL volumetric flask, dilute to the mark with water. Selection of air - acetylene flame at 283.3
nm wavelength, zero water, measuring the absorbance of the solution.
Preparation and determination of sample measurement solutions A.10.2.3.2
Weigh 10.0 g ± 0.01 g sample is placed in a 150 mL beaker, add 30 mL of water, 10 mL of hydrochloric acid (surface covered dish) plus
Heat to dissolve the sample, and boil 5min. A.10.2.3.1 then press the "cooling, the solution was adjusted with a sodium hydroxide solution of pH 1.0 to
1.5, "the operation starts, measuring the corresponding absorbance value.
A.10.2.4 results found
Determination of the sample solution is not greater than the absorbance of lead standard measuring the absorbance of the solution.
A.11 Determination of Arsenic
A.11.1 reagents and materials
A.11.1.1 hydrochloric acid solution. 1 + 3.
A.11.1.2 arsenic standard solution. 1 mL solution containing 1.0 μg of arsenic (As).
Pipette 1.00 mL of arsenic standard solution according to HG/T 3696.2 requirements formulated and placed in 1000 mL volumetric flask, dilute with water to the mark,
Shake well. The solution is using now.
A.11.1.3 other agents with GB/T 5009.76-2003 of Chapter 9.
A.11.2 instruments and equipment
With GB/T 5009.76-2003 Chapter 10.
A.11.3 Analysis steps
Weigh 1.00 g ± 0.01 g sample was placed in a given arsenic bottle. Added 10 mL hydrochloric acid solution to dissolve the sample.
Limits formulated solution. Pipette 1.00 mL of arsenic standard solution, given arsenic placed in the bottle, according to the following section GB T 5009.76-2003 /
Chapter 11 provisions were measured.
Determination of sulfate A.12
A.12.1 reagents and materials
A.12.1.1 hydrochloric acid solution. 1 + 2.
A.12.1.2 barium chloride solution. 100 g/L.
A.12.1.3 sulfate standard solution. 1 mL solution of a sulfate (SO42-) 0.10 mg.
Pipette 10.00 mL sulfate standard solution according to HG/T 3696.2 requirements formulated and placed in 100 mL volumetric flask, dilute to the mark with water
Degree, shake.
A.12.2 instruments and equipment
Constant temperature water bath. the temperature can be controlled at 40 ℃ ~ 50 ℃.
A.12.3 Analysis steps
Weigh 1.00 g ± 0.01 g sample was placed in 100 mL beaker, add water to dissolve, and the solution was added hydrochloric acid to a pH close to the 7 (pH
Dipstick test), and 5 drops of excess, boil 3 min ~ 5 min, to rush to make carbon dioxide, cool. All were transferred to 50 mL colorimetric tube,
Added 2 mL of barium chloride solution, add water to the mark. Placed in 40 ℃ ~ 50 ℃ water bath for 10 min compare, shall not be deeper than the turbidity
Turbidity standard solution.
Turbidity standard solution was pipetted 2.00 mL sulfate standard solution, and treated in the same sample at the same time.
A.13 clarity test
A.13.1 reagents and materials
A.13.1.1 hexamethylenetetramine solution. 100 g/L.
Weigh 10.0 g ± 0.1 g of silica gel in advance drier 24 h of hexamethylenetetramine, in a beaker, add a small amount of water to dissolve the whole
Unit was transferred to 100 mL volumetric flask, dilute to the mark, shake.
A.13.1.2 solution of hydrazine sulfate. 10 g/L.
Weigh 1.0 g ± 0.1 g of silica gel dryer in advance hydrazine sulfate drying 24 h, and placed in a beaker, add a small amount of water to dissolve all turn
Move to 100 mL volumetric flask, dilute to the mark, shake.
A.13.1.3 standard turbidity solution.
Pipette pipette 25.00 mL hexamethylenetetramine solution and 25.00 mL of hydrazine sulfate solution in a dry reagent bottle, shake,
At room temperature for 24 h, made of standard turbidity solution A. This solution was effective date 60d.
Pipette Pipette 10.00 mL standard turbidity solution A, placed in 1000 mL volumetric flask, dilute to the mark with water, shake, made
Turbidity standard solution B. This solution is valid for one day.
A.13.2 Analysis steps
Weigh 1.00 g ± 0.01 g sample was placed in 25 mL colorimetric tube. After dissolved in water, diluted with water to the mark. Place 5 min
After comparison with the standard turbidity solution, against a black background, from colorimetric tubes above observation, Clarity test solution can not be less than the standard turbidity solution
Clarity was shown.
Turbidity standard solution is to use a pipette Pipette 5.00 mL standard turbidity solution B, placed in 25 mL colorimetric tube, diluted with water to the mark, shake
uniform.
A.14 Determination of bulk density
A.14.1 instruments and equipment
Determination of bulk density A.14.1.1 apparatus shown in Figure A.1.
1- tank (500mL or 250mL);
2- stent;
3- funnel.
Figure A.1 bulk density measuring device of FIG.
Determination A.14.1.2 tank volume
The tank wash, dry, covered with glass, saying that the quality of the glass and get the bucket. Carefully pour water into the tank, with a dropper at near full
Add water to the full, covered with glass, there should be no air bubbles between the filter paper with the external tank and the water glass, glass and feed water tank. Then said
Amount of material quality cans and glass.
Tank volume V, the value in milliliters (mL) according to formula (A.6) Calculated.
Water ρ
21 mmV - = (A.6)
Where.
Numerical m1-- bucket filled with water and the quality of glass units of grams (g);
Numerical m2-- irrigation tank and not the quality of glass units of grams (g);
ρ water - measured density value of pure water at a temperature in grams per milliliter (g/mL), approximately 1 g/mL.
Tank volume calibration at least once a year.
A.14.2 Analysis steps
Figure A.1 installed bulk density measuring device. Weigh bucket quality, accurate to 1 g. Close the funnel at the bottom of the sample filling nature,
Scrape up with a ruler section, place a known mass of material tank, open at the end of the funnel, so that all of the sample flow automatically into the feed tank, scrape with a ruler
The higher part (before screed do not move the bucket), the quality of the sample and weigh the bucket, to the nearest 1 g.
A.14.3 Calculation Results
The bulk density ρ mass per unit volume and its value is expressed in grams per milliliter (g/mL) according to formula (A.7) calculated as follows.
mm 21 - = ρ (A.7)
Where.
Numerical m1-- tank and the sample mass, expressed in grams (g);
m2-- tank quality value in units of grams (g);
Numerical V-- tank volume in milliliters (mL).
Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 0.02 g/mL.
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