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GB 6854-2008: pH primary reagent -- Disodium hydrogen phosphate
Status: Valid GB 6854: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 6854-2008 | English | 169 |
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pH primary reagent -- Disodium hydrogen phosphate
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GB 6854-2008
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| GB 6854-1986 | English | 199 |
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pH Basic line--Disodium hydrogen phosphate
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PDF similar to GB 6854-2008
Basic data | Standard ID | GB 6854-2008 (GB6854-2008) | | Description (Translated English) | pH primary reagent -- Disodium hydrogen phosphate | | Sector / Industry | National Standard | | Classification of Chinese Standard | G61 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 7,770 | | Date of Issue | 2008-12-31 | | Date of Implementation | 2009-06-01 | | Older Standard (superseded by this standard) | GB 6854-1986 | | Quoted Standard | GB/T 601; GB/T 602; GB/T 603; GB/T 610-2008; GB/T 6682; GB 6851; GB/T 9723-2007; GB/T 9724; GB/T 9725; GB/T 9735; GB/T 9738; GB 15346; HG/T 3484; HG/T 3921 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 25 of 2008 (total 138) | | 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 reference reagent pH traits disodium hydrogen phosphate, specifications, testing, inspection and marking and packaging rules. This standard applies to pH reference reagent disodium hydrogen phosphate test. | GB 6854-2008: pH primary reagent -- Disodium hydrogen phosphate---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.
pH primary reagent.Disodium hydrogen phosphate
ICS 71.040.30
G61
National Standards of People's Republic of China
Replacing GB 6854-1986
Posted 2008-12-31
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 are mandatory, other provisions are recommended.
This standard replaces GB 6854-1986 "pH reference reagent disodium hydrogen phosphate," compared with GB 6854-1986 The main changes are as follows.
--- Mixed phosphate pH of the solution (S) Ⅱ value (0.025mol/kg, 25 ℃) by the "pH (S) Ⅱ = pH (S) Ⅰ ± 0.005" to adjust
"PH (S) Ⅱ = pH (S) Ⅰ ± 0.01" (1986 edition 1.1, chapter 4 of this edition);
--- Project Name "reaction solution" to "pH value" (1986 version 1.3,2.3, edition Chapter 4, 5.5);
--- Adjust the water insoluble, sampling the amount of sulfate (2.4.2,2.4.4 1986 edition, this edition 5.7,5.9);
--- PH value, heavy metals and two common methods use chemical reagents Determination (1986 edition 2.3,2.4.10, this edition 5.5,5.15).
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee Chemistry Chemicals Branch (SAC/TC63/SC3) centralized.
This standard is drafted by. Beijing Institute of Chemical Reagents, China Institute of Metrology.
The main drafters of this standard. Han Baoying, repair Hongyu.
This standard was first published in 1986.
Molecular formula. Na2HPO4
Molecular weight. 141.96 (according to 2007 international relative atomic mass)
1 Scope
This standard specifies the reference reagent pH in sodium phosphate dibasic traits, specifications, testing, packaging and inspection rules and signs.
This standard applies to pH reference reagent disodium hydrogen phosphate test.
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
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 610-2008 Chemical Reagent Determination of Arsenic in the general method (ISO 6353-1. 1982, NEQ)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)
GB 6851 pH value reference reagent General
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 9725 General Chemical Reagents potentiometric titration (GB/T 9725-2007, 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 15346 chemical reagent packaging and marking
HG/T 3484 standard chemical reagents glass emulsion and clarity standards
HG/T 3921 Chemicals sampling and acceptance rules
3 Characters
This reagent as white crystals, deliquescent, soluble in water, soluble in alcohol.
4 Specification
Disodium hydrogen phosphate as shown in Table 1.
Table 1
Name pH reference
Mixed phosphate pH of the solution (S) Ⅱ value (0.025mol/kg, 25 ℃) pH (S) Ⅱ = pH (S) Ⅰ ± 0.01
Content (Na2HPO4), /% 99.0 ~ 100.1
pH (20g/L, 25 ℃) 9.1 ~ 9.3
Table 1 (continued)
Name pH reference
Clarity test/number ≤2
Water-insoluble, /% ≤0.002
Chloride (Cl), /% ≤0.002
Sulfate (SO4), /% ≤0.005
Nitrate (NO3), /% ≤0.001
Magnesium (Mg), /% ≤0.001
Potassium (K), /% ≤0.02
Iron (Fe), /% ≤0.001
Arsenic (As), /% ≤0.0005
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 standard titration solution, standard solution, preparations and products, according to GB/T 601, GB/T 602,
Regulations preparation, test water should be consistent with GB/T 6682 specifications in three water samples according to precise weighing 0.01g, the use of GB/T 603's
Solution "%" are represented by the mass fraction.
According to the provisions of GB 6851 was measured using a platinum electrode dihydrotestosterone. Mixed phosphate pH of the solution (S) Ⅰ (0.025mol/kg
Na2HPO4,0.025mol/kgKH2PO4) certificate by the standard substance used to look up.
5.4 Content
Weigh 2g sample dried to constant weight at 110 ℃ ± 2 ℃, accurate to 0.0001g. No carbon dioxide dissolved in 100mL of water,
Determined according to the provisions of GB/T 9725's. With hydrochloric acid standard titration solution [Ba (HCl) = 0.5mol/L] titrated to a pH value of 4.2 as the end point.
Disodium hydrogen phosphate content and its value is "%" means, according to equation (1).
100 (1)
Where.
Value Vp --- hydrochloric acid standard titration solution volume in milliliters (mL);
Ba --- accurate hydrochloric acid standard titration solution concentration value in units of moles per liter (mol/L);
--- The M disodium hydrogenphosphate numerical molar mass in grams per mole (g/mol) [M (Na2HPO4) = 141.96];
Weigh 2g sample was dissolved in 100mL of carbon dioxide-free water, determined according to the provisions of GB/T 9724's.
5.6 Clarity test
Clarity Standard No. 2 Weigh 10g sample was dissolved in 100mL of water, turbidity is not greater than HG/T 3484 stipulated.
5.7 Water insoluble matter
Weigh 50g sample was dissolved in 250mL of water in the water bath for 1h, determined according to the provisions of GB/T 9738's.
5.8 Chloride
Weigh 1g sample was dissolved in 25mL water, add 2mL nitric acid (25%) and 1mL silver nitrate (17g/L), shake for 10min.
The turbidity of the solution was not greater than the standard turbidity solution.
Preparation of the standard solution is to take the turbidimetric 0.02mg containing chloride (Cl) standard solution, the same treatment simultaneously with the sample.
5.9 sulfate
Weigh 0.2g sample was dissolved in 10mL water, add 5mL "Ethanol (95%)", 1mL hydrochloric acid solution (10%), shaking continuously dropwise
Add 3mL barium chloride solution (250g/L), diluted to 25mL, shake, place 10min. Turbidity can not be larger than the standard turbidity solution was
Solution.
Turbidity standard solution was prepared containing 0.01mg ratio is taken sulfate (SO4) standard solution, the same treatment simultaneously with the sample.
5.10 Nitrate
Weigh 1g sample was dissolved in 10mL of water, add 1mL sodium chloride solution (100g/L) and indigo carmine solution 1mL
[Ba (C16H8N2Na2O8S2) = 0.001mol/L], with shaking in the 10s ~ 15s added 10mL sulfuric acid, placed 10min. Solution
The blue shall not be lighter than the standard colorimetric solution.
Preparation of standard color solution is to take the ratio of 0.01mg containing nitrate (NO3) standard solution, and treated in the same sample at the same time.
5.11 Magnesium
5.11.1 prepared from magnesium disodium hydrogen phosphate solution
20g samples were weighed, dissolved in 200mL of water, add 4mL hydrochloric acid solution (20%), 4g of ammonium chloride, heated to boiling, add ammonia 40mL
Solution (10%), shake 12h ~ 18h. Supernatant.
5.11.2 Determination
10g samples were weighed, dissolved in 100mL water, add 2mL of hydrochloric acid solution (20%) (filtered if necessary), 2G chloride, heated to boiling,
Fractional added 25mL aqueous ammonia solution (10%), shake 12h ~ 18h. The precipitation may not be greater than the standard turbidity solution.
Standard preparation turbid solution is to take the ratio of 122mL of disodium hydrogen phosphate solution containing Mg and not containing 0.10mg of magnesium standard solution (Mg), plus
Heat to boiling, add 5mL ammonia solution (10%), with the same volume of the test solution at the same time the same treatment.
5.12 K
Determined according to the provisions of GB/T 9723-2007 of.
5.12.1 Instrument Conditions
Source. Potassium hollow cathode lamp;
Wavelength. 766.5nm;
Flame. acetylene - air.
5.12.2 Determination
Weigh 0.5g sample was 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.
5.13 Iron
1g sample was weighed, dissolved in 20mL of water, add 1mL hydrochloric acid solution (10%), 2mL 5-sulfosalicylic acid dihydrate solution
(100g/L), shake, (10%) plus 5mL ammonia solution, shake. The yellow solution can not be deeper than the standard colorimetric solution.
Preparation of the standard solution is to take the colorimetric containing 0.01mg of iron (Fe) standard solution, the same treatment simultaneously with the sample.
5.14 Arsenic
Weigh 0.5g sample was dissolved in 70mL water, measured by the GB/T 610-2008 4.1 requirements. Brown mercuric bromide paper that was
No deeper than the standard colorimetric test strips.
Standard color strip ratio is prepared to take 0.0025mg containing arsenic (As) standard solution, and treated in the same sample at the same time.
5.15 Heavy Metal
Weigh 4g sample is dissolved in water, acetic acid (glacial acetic acid) and diluted to 20mL. Take 15mL, according to the provisions of GB/T 9735 measured
set. The solution was dark can not be deeper than the standard colorimetric solution.
Book GB 6854-2008
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 test solution at the same time the same treatment.
6 Inspection rules
According to the provisions of HG/T 3921 is sampled and acceptance.
7 Packaging and marking
According to GB 15346 requirements for packaging, storage and transportation, and flags are given, including.
Inner packaging. NB-4NB-5;
Packaging forms. WB-1;
Packing unit. Class 2, Class 3.
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