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GB 10733-2008: Primary chemical -- Sodium chloride
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PDF similar to GB 10733-2008
Basic data | Standard ID | GB 10733-2008 (GB10733-2008) | | Description (Translated English) | Primary chemical -- Sodium chloride | | Sector / Industry | National Standard | | Classification of Chinese Standard | G61 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 18,157 | | Date of Issue | 2008-06-18 | | Date of Implementation | 2009-06-01 | | Older Standard (superseded by this standard) | GB 10733-1989 | | Quoted Standard | GB/T 602; GB/T 603; GB/T 609; GB/T 6682; GB/T 9723-2007; GB/T 9724; GB/T 9727; GB/T 9728; GB/T 9735; GB/T 9738; GB/T 9739; GB 15346; HG/T 3484; JJG 99; JJG 116; JJG 153; JJG 1006 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 10 of 2008 (total 123) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies the characteristics of sodium chloride in the first reference reagent, specifications, testing, inspection and marking and packaging rules. This standard applies to the first reference reagent sodium chloride test. | GB 10733-2008: Primary chemical -- Sodium chloride---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Primary chemical.Sodium chloride
ICS 71.040.30
G61
National Standards of People's Republic of China
Replacing GB 10733-1989
The first reference reagent sodium chloride
Posted 2008-06-18
2009-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The standard Chapter 4 5.3.3,5.3.4.1 are mandatory, other provisions are recommended.
This standard replaces GB 10733-1989 "first reference reagent (capacity) sodium chloride", compared with GB 10733-1989, the major change
Of the following.
--- Standard name changed to "first reference reagent sodium chloride";
--- Increasing the normative references (1989 edition Chapter 2, Section 2 of this edition);
--- Modify the description of the determination of the principles of the (1989 version 4.1.1, this version 5.3.1);
--- Modify the constant current coulometric apparatus diagram (1989 version 4.1.3.4, this edition 5.3.2.4);
--- Improve titration steps (1989 version 4.1.4.3, this edition 5.3.3.4);
--- Modify the inspection rules (1989 edition Chapter 5; Chapter 6 of this edition);
--- Increasing the content of the calculation method of Uncertainty (Excerpts Appendix B) was measured;
--- Canceled Appendix B, Appendix C (1989 edition Appendix B, Appendix C).
This standard appendix A normative appendix, Appendix B is an informative annex.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the Chemicals Branch of the National Chemical Standardization Technical Committee.
This standard is drafted by. China Institute of Metrology, Beijing Institute of Chemical reagents.
The main drafters of this standard. FEI brother, Wu Bing, Han Baoying, strong Jing Lin.
This standard replaces the standards previously issued as follows.
--- GB 10733-1989.
The first reference reagent sodium chloride
Molecular formula. NaCl
Molecular Weight. 58.443 (according to 2005 international relative atomic mass).
1 Scope
This standard specifies the characteristics, specifications, testing, inspection rules, and packaging and marking the first reference reagent sodium chloride.
This standard applies to the first reference test reagent sodium chloride.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 602 Determination of impurities in chemical reagents prepared standard solution (GB/T 602-2002, ISO 6353-1. 1982, NEQ) with
GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982,
NEQ)
GB/T 609 chemical reagent - General method for determination of total nitrogen (GB/T 609-2006, ISO 6353-1. 1982, NEQ)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
GB/T 9723-2007 Chemicals flame atomic absorption spectrometry General
GB/T 9724 General rule for determination of pH chemical reagent (GB/T 9724-2007, ISO 6353-1. 1982, NEQ)
GB/T 9727 General method for the determination of phosphate chemical reagent (GB/T 9727-2007, ISO 6353-1. 1982, NEQ)
GB/T 9728 General method for determination of chemical reagents sulfate (GB/T 9728-2007, ISO 6353-1. 1982, NEQ)
GB/T 9735 General method for determination of heavy metals Chemicals (GB/T 9735-2008, ISO 6353-1. 1982, NEQ)
GB/T 9738 Chemicals water insoluble determination General method (GB/T 9738-2008, ISO 6353-1. 1982, NEQ)
GB/T 9739 General method for determination of iron chemical reagents (GB/T 9739-2006, ISO 6353-1. 1982, NEQ)
GB 15346 chemical reagent packaging and marking
HG/T 3484 standard chemical reagents glass emulsion and clarity standards
JJG99 weight
JJG116 standard resistor
JJG153 standard battery
JJG1006 a standard material specification
3 Characters
This reagent is a white crystalline powder, soluble in water, almost insoluble in ethanol.
4 Specification
Sodium chloride as shown in Table 1.
Table 1
Name the first reference
Content (NaCl), /% 99.98 ~ 100.02
pH value (50g/L, 25 ℃) 5.0 ~ 8.0
Table 1 (continued)
Name the first reference
Clarity test/number ≤2
Water-insoluble, /% ≤0.003
Iodide (I), /% ≤0.001
Bromide (Br), /% ≤0.005
Sulphate (SO4), /% ≤0.001
Total nitrogen (N), /% ≤0.0005
Phosphate (PO4), /% ≤0.0005
Hexacyanoferrate (Ⅱ) salt (with Fe (CN) 6 meter), /% ≤0.0001
Magnesium (Mg), /% ≤0.001
Potassium (K), /% ≤0.01
Calcium (Ca), /% ≤0.002
Iron (Fe), /% ≤0.0001
Barium (Ba), /% ≤0.001
Heavy metals (Pb), /% ≤0.0005
5 Test
5.1 Warning
Reagents used in this test method are toxic or corrosive, some of the testing process can lead to dangerous situations, the operator should take
Appropriate safety and health practices.
5.2 General Provisions
Unless specified otherwise in this chapter, the use of reagent purity should be more analytical, standard solution, preparations and products, according to GB/T 602,
GB/T 603 provisions of preparation, test water should be consistent with GB/T 6682 specifications in two water samples according to precise weighing 0.01g, used
Solution "%" are represented by the mass fraction. High purity nitrogen gas should be used.
5.3 Content
5.3.1 Principle of the method
Coulomb analysis is performed by measuring a quantitative analysis of material from one electrode reaction, or a substance to be analyzed and the electrode reaction
Charge (coulombs) chemical reaction product was quantitatively consumed to quantitative analysis. Coulometry principle is based on the law
Where.
Molar mass M --- material in units of grams per mole (g/mol);
--- Like the number of electron transfer;
F --- Faraday constant ampere seconds per mole of (A · s/mol);
I --- the current solution by electrolysis, in amperes (A);
Constant current precision coulometric titration method is based on a constant current through the electrolytic cell, so that the working electrode electrolysis to produce a titrant with cell
The test substance quantitative reaction, electrochemical method to indicate the end of the reaction, the consumption of electricity by electrolysis calculated according to Faraday's law
The amount of titrant to calculate the content of the test substance.
This method uses more than 99.999% pure silver as the anode, electrolysis silver ion to be measured sodium chloride-containing reaction assay
Amount, potentiometric method indicates the end of the reaction.
5.3.2 instruments and devices
5.3.2.1 DVM. accuracy 0.1mV.
5.3.2.2 Weight. meet JJG99 verification requirements. G group, the annual variation of less than 10μg; mg group, the annual variation of less than 4μg.
5.3.2.3 heated fuel tank. temperature control accuracy of ± 0.01 ℃.
5.3.2.4 Coulomb constant current device diagram (see Figure 1).
1 --- high precision timing constant current source;
2 --- 7½-Meter;
3 --- electrolytic cell;
4 --- end indicator (digital voltmeter);
5 --- dummy load resistor;
6 --- Standard resistance;
7 --- galvanometer;
8 --- temperature standard battery pack;
. 9 --- step switch;
10 --- heated fuel tank.
Figure 1 Schematic diagram of the constant current coulometric
a) high-precision timing constant current source. stability is better than one hundred thousandth of the dynamic characteristics of a good steady flow DC power supply, with 1.0186 ×
1.0186 × 10mA and 100mA two output current, the current value is determined by the compensation method; the minimum timing resolution 0.1ms, current
Timing and synchronization of less than 0.1ms.
b) temperature control standard battery pack. should meet the requirements of JJG153. Range 1V, annual variation of less than 5μV.
c) Standard resistance. should meet the requirements JJG116 of. Relative uncertainty is generally not more than 3 × 10-6.
d) direct radiation galvanometer. resistance < 100Ω, critical external resistance < 1000Ω, dividing the value of < 3 × 10-9A.
5.3.2.5 electrolytic cell apparatus (see Figure 2).
An anode compartment (left) and a cathode chamber (right side) is made of quartz glass with a diameter of 50mm, 125mm high cylindrical. With between two chambers
Diameter 20mm, glass horizontal length 80mm connections in the tube melting inside back cover sheet respectively No. 2,2,3 glass sand core, thereby forming two
Have an intermediate chamber manifold with the piston, and the pressure by pumping nitrogen gas pressurization method the electrolyte solution out of the intermediate chamber. Small room two sand core
The distance between the distance 20mm, two large chamber between the sand core is 40mm. The anode chamber mouth tight with a good pre-treated white rubber
Plug 1 is inserted through the stopper rods were anode 2 silver, 3 nitrogen inlet, nitrogen outlet pipe 4, double salt bridge calomel electrode 5, silver indicator electrode rod 6,
7 sample dropper. The bottom of the anode compartment has 20mm long was stirred in a sealed Teflon tube about the magnet 9. The anode chamber and the intermediate chamber
Both black and red cloth cover with wrap, in order to avoid decomposition of the reaction product to light. Platinum mesh cathode cathode chamber 10, the bottom of a cast silicone gel
Plug 11.
Electrolytic cell unit on magnetic stirrer workbench.
Note. Preparation of silicone gel plug
Under stirring, a nitric acid solution to 40mL (2mol/L) was added slowly sodium silicate solution (250g/L) until the solution was slightly acidic when heated to boiling, cooled,
Into the electrolytic cell cathode chamber, was added slowly under continued stirring sodium silicate solution (250g/L), until the colloid appears.
1 --- white rubber plug;
2 --- silver anode rod;
3 --- nitrogen inlet;
4 --- nitrogen outlet pipe;
5 --- double salt bridge SCE;
6 --- Silver Slugger indicator electrode;
7 --- sample dropper;
8 --- sample port;
. 9 --- stirring;
10 --- platinum net cathode;
. 11 --- silicon gel plug;
12 --- piston 1;
Pistons 13 --- 2.
2 cell apparatus of FIG.
5.3.3 Determination
5.3.3.1 Formulation
7mL amount of nitric acid, diluted to 1000mL.
139mL amount of nitric acid, diluted to 1000mL.
5.3.3.1.3 saturated sodium nitrate solution
The sodium nitrate dissolved in nitric acid solution (0.1mol/L), and up to the precipitation of crystals.
Weigh 0.85g of silver nitrate, dissolved in water, add a few drops of nitric acid, diluted to 1000mL.
Weigh 0.58g of sodium chloride dissolved in water and diluted to 1000mL.
5.3.3.1.6 electrolyte solution
Weigh 170g sodium nitrate, plus 114.6mL acetic acid (glacial acetic acid) (excellent pure) and 1300mL "ethanol (95%)" (excellent pure), diluted
To 2000mL.
5.3.3.2 said sample
The sample was placed in a platinum crucible, calcined at 500 ℃ 6h, cooled to room temperature in a desiccator.
Small sample is placed in a polyethylene cup, weighing alternative method to the nearest 0.00001g. Sample mass for buoyancy correction, the correction side
See Appendix A. Law
5.3.3.3 Pre-titration
Cathode chamber 100mL saturated solution of sodium nitrate, in order to eliminate any traces of halide ions cause an error of measurement, in general
Silver nitrate solution was added 1mL previously (0.005mol/L). The anode compartment was added 100mL electrolyte solution. At 5 ℃ passing a high purity nitrogen
1h oxygen. To draw a small amount of electrolyte solution to the anode compartment intermediate chamber (solution depth approximately in the middle of the indoor 2mm). Added to the anode chamber
20 drops of sodium chloride solution (0.01mol/L), the anode chamber and the intermediate chamber with the red and black cloth strict. In 10.186mA current electrolysis 90s, with increasing
Method for pre-titration curve. After the pre-titration, with compression and decompression method of washing the intermediate chamber, and washed the cell wall, eventually recording means
Shown potential. Pre-draw titration curves (Figure 3). Fig. C is a pre-titration end point, A point represents electrolysis stop time, B indicating the completion point
Finally, E-value of the solutions after washing. The amount of charge (amount of charge between the respective BC) consumed more than titration, it should be included in the total charge titration.
Figure 3 pre-titration curve
5.3.3.4 titration end point and seek
In order to open the piston 1 and the piston 2, so that the anode chamber by vacuum intermediate chamber filled with electrolyte solution, closed piston. Sheng to polyethylene sample
Ene cup add a few drops of water, make it most dissolved. When loading with a wash solution dropper dropper to suck, the rubber plug is inserted in a hole in the back.
And sample cup into the pre-titration undissolved anode compartment of the electrolytic solution, the solution was stirred to make it dissolved. The anode compartment electrolyte solution
Continue through the surface of high purity nitrogen. On the dummy load current is adjusted to 101.86mA, connected to two electrodes, stirring was stopped, start electrolysis. When electrolysis
When silver ions produced the desired amount of the sample to reach half of the reaction, with stirring, was added a solution of about half of the dropper, stirring was stopped, and then
After 500s ~ 1000s, still under stirring, the dropper was all finished, stirring was stopped when the amount of silver ions produced by electrolysis phase
When in the sample required 99.90% to 99.95% per volume, stop electrolysis. First open stirring, 5min after using compression and decompression method of washing
Polyester intermediate chamber, and washed the cell wall, draw dropper anode compartment electrolyte solution was washed several times, from the middle-high purity nitrogen 40min after the branch pipe,
Remove the polyethylene small cup from the anode chamber.
In 10.186mA current, pre-titration with the same cell on the ice, as the end point of the titration curve by incremental method, had to end after
It can make some more. Anode compartment electrolyte solution washed sand core, the walls several times, and then washed several times dropper, note reading, drawing
Finally, E-value of the solutions after a wash.
Figure 4 endpoint titration curve
5.3.4 Calculation
5.3.4.1 sodium chloride mass fraction calculated
The mass fraction of sodium chloride and its value is "%" means, according to equation (2).
= QPQT ×
100 = I
(2)
Where.
--- The QP electrolytic sample charge amount actually consumed by the coulombs (the C);
Theoretical amount of charge required for electrolysis of the QT --- sample, in units of coulombs (the C);
I --- the current solution by electrolysis, in amperes (A);
--- The M NaCl numerical molar mass in grams per mole (g/mol);
--- Like the number of electron transfer;
F --- Faraday constant ampere seconds per mole of (A · s/mol);
E --- standard electromotive force in volts (V);
R --- standard resistor in ohms (Ω).
(2) In the formula.
Where.
I1 --- large current electrolysis current value in units of milliamperes (mA);
I2 --- pre-titration end point and seek current value, in milliamperes (mA);
Uncertainty and assay results of calculation 5.3.4.2
Expanded uncertainty assay results should generally be less than 0.02% (k = 2), the calculation method, see Appendix B.
Determined according to the provisions of GB/T 9724's.
5.5 Clarity test
Clarity Standard No. 2 Weigh 25g sample was dissolved in 100mL of water, turbidity is not greater than HG/T 3484 stipulated.
5.6 Water insoluble matter
Weigh 50g sample was dissolved in 200mL of water in the water bath for 1h after, according to the provisions of GB/T 9738 Determination.
5.7 iodide
Weigh 11g sample was dissolved in 50mL of water and transferred to a separatory funnel, add 2mL 5mL hydrochloric acid and ferric chloride solution (100g/L), shake
Uniform, placed 5min. Add 10mL of carbon tetrachloride, shaking 1min, standing layer, carbon tetrachloride layer was collected in colorimetric tube, and then each time with
5mL carbon tetrachloride extracted twice, into the colorimetric tube (reservations aqueous sample). The organic layer was purple No deeper than the standard colorimetric solution.
Preparation of standard color solution is to take the ratio of 1g sample and containing 0.1mg of iodine (I) and a standard solution containing 0.5mg of bromine (Br) standard solution,
The same treatment simultaneously with the sample (standard water retention).
5.8 bromide
The aqueous sample 5.7 separating funnel to retain each extracted twice with 5mL carbon tetrachloride, carbon tetrachloride was discarded, added to the solution
35mL sulfuric acid solution (1 + 1) and 10mL chromic acid solution (100g/L), shake for 5min. Add 10mL of carbon tetrachloride, shaking
1min, place stratification. Carbon tetrachloride layer was collected in colorimetric tube, and then 5mL carbon tetrachloride extraction, into a colorimetric tube. The organic layer was
Yellow No deeper than the standard colorimetric solution.
Preparation of standard color solution is to take the ratio of the standard solution 5.7 with an aqueous solution of 5.8 to retain the specimen while the same treatment.
5.9 sulfate
Weigh 1g sample was dissolved in 20mL of water, add 0.5mL hydrochloric acid solution (20%) after acidification, according to the provisions of GB/T 9728 Determination.
The turbidity of the solution was not greater than the standard turbidity solution.
Standard preparation turbid solution is to take the ratio of 0.01mg containing sulfate (SO4) standard solution, and treated in the same sample at the same time.
Total nitrogen content of 5.10
Weigh 2g sample was dissolved in water and diluted to 140mL, determined according to the provisions of GB/T 609's. The yellow solution can not be deeper than the standard ratio
Color solution.
Preparation of the standard developing solution containing 0.01mg ratio is taken of nitrogen (N) standard solution, the same treatment simultaneously with the sample.
5.11 Phosphate
Weigh 1g sample was dissolved in an appropriate amount of water, add 2 drops of saturated 2,4-dinitrophenol indicator solution, a solution of nitric acid solution (13%) just to yellow
Disappeared after diluted to 10mL, according to the provisions of GB/T 9727 Determination. The organic layer was blue can not be deeper than the standard colorimetric solution.
Preparation of the standard developing solution containing 0.005mg is to take the ratio of phosphate (PO4) standard solution, the same treatment simultaneously with the sample.
5.12 hexacyanoferrate (Ⅱ) salt
Weigh 3.5g sample was dissolved in 12mL of water, add 0.2mL sulfuric acid solution (20%), plus 0.2mL iron - ferrous mixture, shake,
Place 2min. Add 1mL sodium dihydrogen phosphate solution (200g/L), shake for 30min. The solution was blue No deeper than the standard ratio
Color solution.
Preparation of standard color solution is to take the ratio of 1g sample containing 0.0025mg and the hexacyanoferrate (Ⅱ) salt [Fe (CN) 6] standard solution, and
Sample while the same treatment.
5.13 Magnesium
Determined according to the provisions of GB/T 9723-2007 of.
5.13.1 Instrument Conditions
Source. magnesium hollow cathode lamp;
Wavelength. 285.2nm;
Flame. acetylene - air.
5.13.2 Determination
Weigh 10g sample is dissolved in water and diluted to 100mL. Take 10mL, a total of four. According to GB/T 9723-2007 7.2.2 Regulation
Fixed measurement results calculated according to the provisions of 7.2.3.
5.14 K
Determined according to the provisions of GB/T 9723-2007 of.
5.14.1 Instrument Conditions
Source. Potassium hollow cathode lamp;
Wavelength. 766.5nm;
Flame. acetylene - air.
5.14.2 Determination
With Article 5.13.2.
5.15 Calcium
Determined according to the provisions of GB/T 9723-2007 of.
5.15.1 Instrument Conditions
Source. calcium hollow cathode lamp;
Wavelength. 422.7nm;
Flame. acetylene - air.
5.15.2 Determination
Weigh 10g sample is dissolved in water and diluted to 100mL. Take 20mL, a total of four. According to GB/T 9723-2007 7.2.2 Regulation
Fixed measurement results calculated according to the provisions of 7.2.3.
5.16 Iron
3g weighed sample was dissolved in 15mL water, and the solution was adjusted with hydrochloric acid solution (15%) to pH 2, according to GB/T 9739 regulations
Fixed determination. The red solution should not be deeper than the standard colorimetric solution.
Preparation of the standard solution is to take the colorimetric containing 0.003mg of iron (Fe) standard solution, the same treatment simultaneously with the sample.
5.17 Barium
5.17.1 Preparation of test preparation
Accurately weighed 0.02g barium chloride, dissolved in 100mL ethanol solution (3 + 7). Take 2.5mL and 10mL sodium
(Na2SO4 · 10H2O) solution (400g/L) were mixed accurately placed 1min (mixed before use).
5.17.2 Determination
1g sample was weighed, dissolved in water and diluted to 20mL, add 0.5mL hydrochloric acid solution (20%). Was added to 1.25mL test preparation
Diluted to 25mL, shake for 5min. The turbidity of the solution was not greater than the standard turbidity solution.
Preparation of the standard solution is to take the turbidimetric containing 0.01mg of barium (Ba) standard solution, the same treatment simultaneously with the sample.
5.18 Heavy Metal
Weigh 4g sample was dissolved in water and diluted to 20mL. Take 15mL, according to the provisions of GB/T 9735 Determination. The solution can not be dimmed
Deeper than the standard colorimetric solution.
Preparation of the standard developing solution is to take the ratio of the remaining sample solution and the standard solution 5mL 0.01mg containing lead (Pb), diluted to 15mL,
With the same volume of sample solution at the same time the same treatment.
6 Inspection rules
For mass-produced products, in accordance with the requirements of uniformity JJG1006 initial inspection.
Bulk product inspection can be carried out by the preliminary dispensing, after an official test sample.
Official test sample rule. when the total number of units is less than 200, the number of shape extraction unit less than 11; When the whole is greater than the number of units 200
When less than 500, like less than 12; when the total number of more than 500 units, like no less than 15.
7 Packaging and marking
According to GB 15346 requirements for packaging, storage and transportation, and flags are given, including.
Packing unit. Class 3;
Inner packaging. NB-4, NB-5, NB-6;
Packaging forms. The specifications for the 600g/m2 of box board paper box, outer mounted electro-optical purple paper.
Appendix A
(Normative)
Substance was weighed mass air buoyancy correction
ρW
-1
Where.
ρK --- when the density of the air weighing in grams per cubic centimeter (g/cm
3);
ρW --- density of the material to be weighed in grams per cubic centimeter (g/cm
3);
pf --- weights density in grams per cubic centimeter (g/cm
3).
Formula (A.1) in.
Air density (ρK), in grams per cubic centimeter (g/cm
3), according to equation (A.2) Calculated.
ρK = 0.00129
273.15
Where.
P1 --- atmospheric pressure value in units of kilopascals (kPa);
P2 --- vapor pressure of water at room temperature value in units of kilopascals (kPa);
(A.2) in the formula.
The value of water vapor pressure (P2), in units of kilopascals (kPa), according to equation (A.3) Calculated.
P2 = W × P3 (A.3)
Where.
W --- values of relative humidity of air in%;
Numerical P3 --- saturated vapor pressure of water at room temperature, measured in kilopascals (kPa). Table A. 1.
Water vapor pressure values are shown in Table A. 1.
Table A. 1 Water vapor pressure (P Rao k)
Temperature (℃) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Appendix B
(Informative)
Calculation Determination of Uncertainty
B. Calculate 1 assay results of the Class A standard uncertainty components
A class standard uncertainty component [u A ()] according to formula (B.1) Calculated.
U A () =
Ju ()
槡 like
(B.1)
Where.
Ju () --- times the standard deviation of shape measurement result, the value of "%" means.
B. Calculation 2 assay results of Class B combined standard uncertainty components
The measurement results in accordance with Chapter 5 (2) Class B content relative combined standard uncertainty component [u cBrel ()] according to equation (B.2) Calculated.
U cBrel () = u
rel (M) + u 2rel (F) + u
rel
(X Sang) (B.2)
Where.
U rel (I) --- current relative standard uncertainty component;
U rel (M) --- sodium chlo...
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