Powered by Google www.ChineseStandard.net Database: 189759 (16 Jun 2024)

GB 18582-2008 English PDF

GB 18582-2008_English: PDF (GB18582-2008)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB 18582-2008English115 Add to Cart 0--9 seconds. Auto-delivery Indoor decorating and refurbishing materials -- Limit of harmful substances of interior architectural coatings Obsolete GB 18582-2008
GB 18582-2020English165 Add to Cart 0--9 seconds. Auto-delivery Limit of harmful substances of architectural wall coatings Valid GB 18582-2020


BASIC DATA
Standard ID GB 18582-2008 (GB18582-2008)
Description (Translated English) Indoor decorating and refurbishing materials. Limit of harmful substances of interior architectural coatings [Quasi-Official / Academic version - translated by Chinese Institute]
Sector / Industry National Standard
Classification of Chinese Standard G51
Classification of International Standard 87.040
Word Count Estimation 19,178
Date of Issue 2008-04-01
Date of Implementation 2008-10-01
Older Standard (superseded by this standard) GB 18582-2001
Quoted Standard GB/T 601; GB/T 1250; GB/T 3186-2006; GB/T 6682; GB/T 6750; GB/T 9750
Drafting Organization CNOOC Changzhou Paint & Chemicals Research Institute (National Paint Quality Supervision and Inspection Center)
Administrative Organization National Standardization Technical Committee of paints and pigments
Regulation (derived from) Announcement of Newly Approved National Standards No. 5, 2008 (No. 118 overall)
Proposing organization China Petroleum and Chemical Industry Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee
Summary This Chinese standard specifies the interior decoration water-based wall paint (including paint and primer) and water-based wall putty harmful substances allowed limited requirements, test methods, inspection rules, packaging, signs, safety and protective coating. This standard applies to all indoor decoration decorative water-based wall paint and water-based wall putty.

Standards related to: GB 18582-2008

GB 18582-2008
Indoor decorating and refurbishing materials.Limit of harmful substances of interior architectural coatings
ICS 87.040
G51
National Standards of People's Republic of China
Replacing GB 18582-2001
Interior decoration materials
Interior wall paint harmful substances
Posted 2008-04-01
2008-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard replaces GB 18582-2001 "interior decoration materials, interior wall paint harmful substances."
This standard compared with GB 18582-2001 main technical differences.
--- Range added an aqueous wall putty, and it specifies the value of harmful substances;
Water-based wall paint --- limited value in a significant reduction of volatile organic compounds, volatile representation changed after water removal products
Content of the organic compound;
--- Formaldehyde units of measurement changes, the more stringent limit values;
--- Increased benzene, toluene, ethylbenzene and xylene sum of control programs;
--- Increase the definition of volatile organic compounds, methods of testing the water to deduct total volatiles analyzed by gas chromatography points
From the test sample a variety of volatile organic compounds and qualitative identification and quantitative analysis;
--- Revise and improve the free formaldehyde and soluble heavy metal testing methods;
--- Established as benzene, toluene, ethylbenzene and xylene sum test methods, and volatile organic compounds combine with the test method.
The Standard Appendix A, Appendix B, Appendix C, Appendix D is a normative appendix.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee paint pigment (SAC/TC5) centralized.
This standard is drafted by. CNOOC Changzhou coating Chemical Research Institute (National Paint Quality Supervision and Inspection Center), Beijing Institute of Chemical trace
Studies, Shanghai Institute of paint.
Participated in the drafting of this Standard. China Coating Industry Association, the Shanghai Research Institute of Building Sciences, China Academy of Building Research, Nippon Paint
(China) Co., Ltd., Guangdong Huarun Paints Co., Ltd., Guangdong Carpoly Chemical Co., ICI Swire Paints (China) Co., Ltd.
Shanghai South African building materials company, Guangdong Maydos Chemical Co., Ltd., Putian City Sanjiang Chemical Industry Co., Ltd. Zhiqi China (Shenzhen) have
Limited, South-resin (China) Co., Ltd., Jiangsu East Asian elephants Zhiqi Ltd., Rohm and Haas (China) Investment Co., Ltd., Hangzhou oil
Paint Co., Ltd., Nanjing Tienhsiang Paint Co., Ltd., Changzhou brilliant Chemical Co., Ltd. Dongguan large-Chemical Co., Ltd., Shanghai Fu-chen of
Engineering Co., Ltd., Guangdong Bade Chemical Co.
The main drafters of this standard. Zhangjun Zhi, Zhao Ling, Feng Shifang, Huang Ning, Yu Bin, The energy levels, Zhang Wei group, Cao Haihua, Huang Tianyuan, Yang Yong,
Gongwan Sen, quality beauty segment, Kou Hui, on behalf of Wang Min, Xiong Rong, Wang period, Li Feng, Peng Donghua, Ling Ping, Jiang Yaqin, Yang Shaowu, Yang Wei Jiang, Jiang Fang group,
Xukai Bin, Liu Lin, Huang Jianhua, Ye Rongsen, Fang Xueping.
This standard is December 10, 2001 was first released, this is the first revision.
The standard commission and the National Standardization Technical Committee paint pigment responsible for the interpretation.
Interior decoration materials
Interior wall paint harmful substances
1 Scope
This standard specifies the aqueous interior decoration wall paint (including primer and topcoat) and water-based wall putty harmful substances
Allowable limit requirements, test methods, inspection rules, packaging and marking, safety and protective coating.
This standard applies to all types of interior decoration of water and water-based wall paint wall putty.
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.
Preparation of GB/T 601 chemical reagent standard titration solution
Representation GB/T 1250 limit values and the method of determining
GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT)
GB/T 6682 Water Analysis Laboratory specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)
GB/T 6750 Paints and varnishes - Determination of density - Pycnometer method (GB/T 6750-2007, ISO 2811-1.1997, IDT)
GB/T 9750 product packaging and marking paint
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
101.3kPa at standard pressure, any initial boiling point equal to or lower than the organic compound 250 ℃.
3.2
Prescribed method of test product obtained VOC content.
Note 1. VOC content for the product after deduction of the water wall paint, in grams per liter (g/L) represented.
Note 2. The product does not have to be deducted wall putty moisture content of volatile organic compounds, in grams per kilogram (g/kg) expressed.
4 Requirements
Products harmful substances shall comply with the requirements of Table 1.
Table 1 harmful substances requirements
project
Limited value
Water-based wall paint a water-based wall putty b
Volatile organic compound content (VOC) ≤ 120g/L 15g/kg
Benzene, toluene, ethylbenzene, xylene sum/(mg/kg) ≤ 300
Free formaldehyde/(mg/kg) ≤ 100
Table 1 (continued)
project
Limited value
Water-based wall paint a water-based wall putty b
Soluble heavy metal/(mg/kg) ≤
Lead Pb 90
Cadmium Cd 75
Chromium Cr 60
Mercury Hg 60
a paint products all items not consider dilution ratio.
b putty paste all items not consider dilution ratio; in addition to the soluble heavy metal powder putty powder test project directly, the other three according to the specified
The ratio of the test powder mixed with water or other liquids or adhesive Once. As other liquid ratio within a certain range, the amount of water should be in accordance with the minimum, adhesives and other
Body largest amount of mixing ratio after the test.
5 Test methods
5.1 Sampling
Product sampling as prescribed by GB/T 3186-2006 were.
5.2 Test Method
5.2.1 Volatile organic compound content (VOC) testing according to the provisions of Appendix A and Appendix B of conduct, paint products test results count
Operators in accordance with Appendix A of A. 7.2. Calculation putty product testing results in accordance with Appendix A of A. 7.1.
Note. All samples putty not water content and density testing.
5.2.2 benzene, toluene, ethylbenzene and xylene sum tests prescribed in Appendix A of. The test results calculated in accordance with Appendix A of A. 7.3
get on.
5.2.3 free formaldehyde tests conducted according to the provisions of Appendix C.
5.2.4 soluble heavy metals (lead, cadmium, chromium and mercury) the tests prescribed in Appendix D of. Putty powder with a powder directly tested.
6 Inspection rules
6.1 standard listed all the requirements of both types of test items.
6.1.1 Under normal production conditions, type inspection at least once a year.
6.1.2 There should be one of the following type test at any time.
--- Original shape when the new product;
--- Products produced at different places;
--- Production formula, technology and raw materials have greatly changed;
--- Discontinued after three months to resume production when.
6.2 determination of test results
6.2.1 The test results determined in accordance with GB/T 1250 in the rounding value comparison method.
6.2.2 powdery putty reported test results should be formulated at the same time indicate the proportion.
6.2.3 Test results of all items meet the requirements of this standard, the product to comply with the requirements of this standard.
7 Package mark
Product packaging and marking shall comply with the provisions of GB/T 9750 outside, according to the standard test qualified products can be expressed in the packaging logo.
8 Safety and Protection Coating
8.1 coating should ensure good indoor ventilation.
Construction workers should wear protective equipment are necessary when 8.2 coating.
Continue to maintain good indoor ventilation 8.3 application is completed.
Appendix A
(Normative)
And volatile organic compounds as benzene, toluene, ethylbenzene and xylene to the total content of the test gas chromatography
A. 1 Scope
This method provides an aqueous water-based wall paint and wall putty volatile organic compounds (VOC) and benzene, toluene, ethylbenzene and xylene
Test Method for total content of benzene.
This method is applicable to the VOC content of greater than or equal to 0.1% and less than or equal to 15% of the test paint and raw materials.
A. Principle 2
The sample was diluted by gas chromatographic analysis of volatile organic compounds in the sample a variety of isolated, qualitative identification of the test compound
After using the internal standard method to test its content.
A. 3 Materials and Reagents
A. 3.1 Carrier gas. nitrogen, purity ≥99.995%.
A. 3.2 Gas. hydrogen, purity ≥99.995%.
A. 3.3 assisting gas. air.
A. 3.4 auxiliary gas (septum purge and makeup). with a carrier gas of nitrogen the same nature.
A. 3.5 Internal standard. the absence of the sample compound, and the compound can be completely separated from the other components on the chromatogram. Purity of at least
99%, or known purity. For example. iso-butanol, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether.
A. 3.6 calibration compound
The standard calibration compound include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, benzene, toluene, ethylbenzene, xylene, triethyl
Amine, dimethylethanolamine, 2-amino-2-methyl-1-propanol, ethylene glycol, 1,2-propanediol, 1,3-propanediol, diethylene glycol, ethylene glycol monobutyl ether, diethylene
Ethylene glycol monobutyl ether, diethylene glycol ethyl ether acetate, diethylene glycol monobutyl ether acetate, 2,2,4-trimethyl-1,3-pentanediol. Purity of at least
99%, or known purity.
A. 3.7 Dilution solvent. the organic solvent used for diluting the sample, the material does not contain any interference testing. Purity of at least 99%, or known
purity. For example. acetonitrile, tetrahydrofuran, methanol, or other solvents.
A. 3.8 Markers. used to distinguish between VOC and compound component non-VOC component as defined VOC. This standard adipic acid diethyl
(Boiling point 251 ℃).
A. 4 Equipment
A. 4.1 Gas chromatograph, with the following configuration.
A. 4.1.1 Inlet and dividing device, and vaporizing chamber liner can be replaced.
A. 4.1.2 programmed temperature controller.
A. 4.1.3 Detector. The following three types of detectors either.
A. 4.1.3.1 flame ionization detector (FID).
A. 4.1.3.2 calibrated and tuned mass spectrometer or other mass selective detector.
A. 4.1.3.3 calibrated Fourier transform infrared spectroscopy (FT-IR spectrometer).
NOTE. If you choose A. 4.1.3.2 or A. 4.1.3.3 detector to separate the qualitative identification of components, equipment should be connected to a gas chromatograph instrument and according to
Manufacturer's operating instructions.
A. 4.1.4 Column. polydimethylsiloxane capillary column or 6% nitrilpropionamide phenyl/94% polydimethylsiloxane capillary column, polyethylene glycol
Capillary column.
A. 4.2 Injector. micro syringe, 10μL.
A. 4.3 with vials. Approximately 20mL glass bottle with a sealable cap.
A. 4.4 Balance. Precision 0.1mg.
A. 5 GC test conditions
A. 5.1 chromatographic conditions 1
Column (column basic). polydimethylsiloxane capillary column, 30m × 0.32mm × 1.0μm;
Inlet temperature. 260 ℃;
Detector. FID, temperature. 280 ℃;
Column temperature. temperature programming, 45 ℃ holding 4min, then 8 ℃/min raised to 230 ℃ to maintain 10min;
Split ratio. Split injection, split ratio is adjustable;
Injection volume. 1.0μL.
A. 2 chromatographic conditions 5.2
Column (column basic). 6% nitrilpropionamide phenyl/94% polydimethylsiloxane capillary column, 60m × 0.32mm × 1.0μm;
Inlet temperature. 250 ℃;
Detector. FID, temperature. 260 ℃;
Column temperature. temperature program, 80 ℃ 1min, to then 10 ℃/min was raised to 230 ℃ kept 15min;
Split ratio. Split injection, split ratio is adjustable;
Injection volume. 1.0μL.
A. 5.3 chromatographic conditions 3
Column (column confirmed). polyethyleneglycol capillary column, 30m × 0.25mm × 0.25μm;
Inlet temperature. 240 ℃;
Detector. FID, temperature. 250 ℃;
Column temperature. temperature program, 60 ℃ 1min, to then 20 ℃/min was raised to 240 ℃ kept 20min;
Split ratio. Split injection, split ratio is adjustable;
Injection volume. 1.0μL.
Note. You can also select the optimal test conditions according to the GC gas chromatograph and the performance of the test sample with the actual situation.
A. 6 Test Procedure
A. 6.1 Density
Density test according to GB/T 6750 carried out.
A. 6.2 Moisture content
Test the moisture content in accordance with Appendix B of.
A. 6.3 volatile organic compounds and benzene, toluene, ethylbenzene and xylene to the total content
A. 6.3.1 Chromatograph parameter optimization
Press A. 5 chromatographic conditions, always be aware of the calibration compound to optimize its processing, the sensitivity of the instrument,
Stability and separation at its best.
A. 6.3.2 Qualitative Analysis
Have qualitative identification of the sample A. 3.6 calibration compound. A preferred method is gas chromatography with mass selective detector
(A.4.1.3.2) or FT-IR spectrometer (A.4.1.3.3) in conjunction with, and use A. 5 shows gas chromatography test conditions. It can also be used
Gas chromatograph, using a flame ionization detector (FID) (A.4.1.3.1) and A. 4.1.4 in the column, and the use of A. 5 given
Gas chromatography test conditions were recorded A. 3.6 Calibration compound in a polar difference between the two columns (two columns selected due
May be large, e.g., 6% nitrilpropionamide phenyl/94% chromatogram polydimethylsiloxane capillary column and polyethyleneglycol capillary column) on; the same
Chromatographic test conditions, the test sample after being made a qualitative comparison of the chromatogram.
A. 6.3.3 Calibration
A. 6.3.3.1 Calibration sample preparation. Weigh a certain amount (accurate to 0.1mg) A. 6.3.2 The identified compounds in various calibration
Hotels vial (A.4.3), the mass to be weighed and the content of each test sample should be in the same order of magnitude; the same number called again take the test compound
The order of the internal standard (A.3.5) with the same vial, diluted mixture was diluted with a solvent (A.3.7), seal with the vial and shake.
A. 6.3.3.2 relative correction factor test. the test specimen under the same chromatographic test conditions press A. 6.3.1 Optimization of the provisions of the instrument
parameter. Injecting an appropriate amount of calibration compound gas chromatograph, record the chromatograms. According to formula (A.1) were calculated for each compound
Relative correction factor.
(A.1)
Where.
Ais --- internal standard peak area;
A. 6.3.3.3 If there is A. 3.6 unknown compound peaks outside the calibration compound, it is assumed with respect to the correction factor isobutanol
Sub 1.0.
A. 6.3.4 Test specimens
A. 6.3.4.1 sample preparation. Weigh 1g even after stirring the sample (accurate to 0.1mg) as well as the quality of the measured object within approximately equal
Standard material (A.3.5) in vials with (A.4.3) added 10mL diluent solvent (A.3.7) diluted sample, seal with the vial and shake.
A. 6.3.4.2 Press optimal conditions during calibration setting instrument parameters.
A. 6.3.4.3 the marker (A.3.8) into the gas chromatograph, which recorded in polydimethylsiloxane capillary column or 6% nitrile propylbenzene
Yl/94% polydimethylsiloxane capillary column retention times, according to the definitions given 3.1 VOC determination chromatogram integration
end.
A. 6.3.4.4 The 1μL press A. 6.3.4.1 preparation of the sample into the gas chromatograph, record the chromatograms, and record the various retention time low
Compound peak area markers (except dilution solvent outside), then according to equation (A.2) calculate the mass contained in the sample were various compounds
fraction.
(A.2)
Where.
Ais --- internal standard peak area;
A. 7 Calculation
A. 7.1 putty product according to formula (A.3) to calculate VOC content.
Where.
VOC content (VOC) --- putty products in grams per kilogram (g/kg);
1000 --- conversion factor.
Test Method detection limit. 1g/kg.
A. 7.2 coating product according to formula (A.4) to calculate VOC content.
ρ (VOC) =
1-ρs ×
ρw
× ρs × 1000 (A.4)
Where.
P VOC content (VOC) --- paint products, in grams per liter (g/L);
w --- test sample mass fraction of water in grams per gram (g/g);
Density ρs --- sample in grams per milliliter (g/mL);
ρw --- the density of water in grams per milliliter (g/mL);
1000 --- conversion factor.
Test Method detection limit. 2g/L.
A. 7.3 paint and putty products benzene, toluene, ethylbenzene and xylene sum calculation
Benzene, toluene, ethylbenzene and xylene content of the sum of.
Where.
b --- products of benzene, toluene, ethylbenzene and xylene sum content in milligrams per kilogram (mg/kg);
106 --- conversion factor.
A. 7.3.2 Test Method detection limit. four kinds sum BTEX 50mg/kg.
A. 8 Precision
A. 8.1 Repeatability
The relative deviation of the test results by the same operator twice less than 10%.
A. 8.2 Reproducibility
Different laboratory test results relative deviation of less than 20%.
Appendix B
(Normative)
Test the moisture content
The standard moisture content by gas chromatography or Karl Fischer test. Gas chromatography for the arbitration.
B. 1 Gas Chromatography
B. 1.1 Reagents and materials
B. 1.1.1 Distilled water. in line with GB/T 6682 in the three water requirements.
B. 1.1.2 dilution solvent. anhydrous dimethylformamide (DMF), AR.
B. 1.1.3 Internal standard. anhydrous isopropanol, AR.
B. 1.1.4 Carrier gas. hydrogen or nitrogen purity of not less than 99.995%.
B. 1.2 Equipment
B. 1.2.1 Gas chromatograph. equipped with a thermal conductivity detector and temperature program controller.
B. 1.2.2 Column. packed porous polymer microspheres stainless steel column.
B. 1.2.3 Injector. micro syringe, 10μL.
B. 1.2.4 with vials. Approximately 10mL glass bottle with a sealable cap.
B. 1.2.5 scales. accuracy 0.1mg.
B. 1.3 GC test conditions
Column. Column length 1m, an outer diameter of 3.2mm, filling 177μm ~ 250μm porous polymer microspheres stainless steel column.
Vaporization chamber temperature.200 ℃.
Detector. temperature 240 ℃, current 150mA.
Column temperature. the temperature program, 80 ℃ maintained 5min, then 30 ℃/min was raised to 170 ℃ holding 5min; thermostatically column temperature was
90 ℃, in isopropanol completely outflow, the oven temperature is 170 ℃, DMF until the end. If you continue to test, then the column temperature dropped to 90 ℃.
Note. You can also select the optimal test conditions according to the GC gas chromatograph and the performance of the test sample with the actual situation.
B. 1.4 Test Procedure
B. 1.4.1 Test water relative correction factor R
Weigh about 0.2g of distilled water (B.1.1.1) and isopropanol at about the same with 0.2g vial (B.1.2.4) in (B.1.1.3) ,
Accurate to 0.1mg, then add 2mL of dimethylformamide (B.1.1.2), seal with the vial and shake. Using a micro syringe
(B.1.2.3) draw 1μL vial with a mixture injected into the chromatograph, record the chromatograms. According to equation (B.1) to calculate the relative water correction factors
Sub R.
R =
(B.1)
Where.
Relative correction factor R --- water;
AI --- isopropanol peak area;
AW --- water peak area.
If isopropanol and anhydrous dimethyl formamide reagent instead, places the same amount of isopropanol and dimethyl formamide (mixed solution), but without water
As a blank, blank record in the water peak area A0. According to equation (B.2) to calculate the relative water correction factor R.
(Aw-A0)
(B.2)
Where.
Relative correction factor R --- water;
AI --- isopropanol peak area;
AW --- water peak area;
A0 --- blank water peak area.
The average R value takes two test results, the relative deviation should be less than 5%, to retain three significant figures.
B. 1.4.2 Sample Analysis
Weigh 0.6g sample even after stirring well with a water content of approximately equal isopropanol (B.1.1.3) Hotels in vials (B.1.2.4), the
Accurate to 0.1mg, then add 2mL dimethylformamide (B.1.1.2), seal with the vial and shake. While preparing a sample without
Isopropanol and dimethylformamide mixture as a blank sample. Shaken vigorously with a vial containing the sample 15min, placed 5min, to precipitate
(Precipitation of the sample as soon as possible, can be equipped with a kind of specimen bottle was added a few grains of glass beads, then shake vigorously; also be used low-speed centrifuge
Precipitated). Draw using a micro syringe (B.1.2.3) 1μL with a vial of the supernatant into the chromatograph, record the chromatogram. press
Formula (B.3) the moisture content in the sample was calculated.
w =
× 100 (B.3)
Where.
w --- sample moisture content mass fraction,%;
Relative correction factor R --- water;
AI --- isopropanol peak area;
Aw --- water sample peak area;
A0 --- blank water peak area.
Parallel test twice, the average of the two test results, retaining three significant figures.
B. 1.5 Precision
B. 1.5.1 Repeatability
Same operator twice the relative deviation of the test results is less than 1.6%.
B. 1.5.2 Reproducibility
Relative deviations between different laboratories test results is less than 5%.
B. 2 Karl Fischer method
B. 2.1 Equipment
B. 2.1.1 Karl Fischer titrator.
B. 2.1.2 scales. accuracy 0.1mg, 1mg.
B. 2.1.3 micro syringe. 10μL.
B. 2.1.4 dropper. 30mL.
B. 2.1.5 magnetic stirrer.
B. 2.1.6 beaker. 100mL.
B. 2.1.7 dish.
B. 2.2 Reagents
B. 2.2.1 Distilled water. in line with GB/T 6682 in the three water requirements.
B. 2.2.2 Karl Fischer reagents. choose a suitable reagent (for a sample, the main component of the reagent-free aldehyde and ketone compounds are iodine, chlorine dioxide
Sulfur, methanol, an organic base. For the sample containing aldehyde and ketone compounds, aldehydes and ketones should use special reagents, mainly composed of iodine, imidazole dioxide
Sulfur, 2-methoxyethanol, 2-chloro-ethanol and chloroform).
B. 2.3 Experimental Procedure
B. 2.3.1 Karl Fischer titration concentration calibration
In the titrator (B.2.1.1) by adding fresh cup of titration Karl Fischer solvent (B.2.2.2) to the pole end surface coverage to
Karl Fischer titration agent is titrated to the endpoint (drift < 10μg/min). Using a micro syringe (B.2.1.3) will 10μL distilled water
(B.2.2.1) injected into the titration cell, using the reduction method, said water quality was (accurate to 0.1mg), and inputs the quality to titrator with
Karl Fischer titration titrant to the end, recording instruments show calibration results.
Repeat the calibration until two adjacent calibration values differ by less than 0.01mg/mL, determined the average of two calibration, the calibration knot
If you enter into the titrator.
When the relative humidity is less than 70% of the detected environment should be calibrated once a week; when relative humidity is greater than 70%, should be calibrated twice a week; Required
When you want to, at any time calibration.
B. 2.3.2 Sample Preparation
If the viscosity of the sample is large, not well dispersed in the Karl Fischer solvent, you will need the right amount of sample dilution. Beaker
(B.2.1.6) said sample after learn Stir 20g (accurate to 1mg), then about 20% of distilled water into the beaker
(B.2.2.1), accurate records of sample weight and the amount of water. The beaker covered dish (B.2.1.7), stirred in a magnetic stirrer (B.2.1.5) on
10min ~ 15min. The diluted sample into the dropper (B.2.1.4) in the back.
NOTE. For Karl Fischer solvent can be well dispersed sample can be used directly in the test sample moisture content. After adding water to 20%, in Karl Fisher
Hugh solvent is still not well dispersed sample, can gradually increase the amount of water dilution.
B. 2.3.3 Deter...
...