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GB 12595-2008: Working chemical -- Silver nitrate
Status: Valid GB 12595: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 12595-2008 | English | 169 |
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Working chemical -- Silver nitrate
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GB 12595-2008
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| GB 12595-1990 | English | 279 |
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Working chemical--Silver nitrate
| Obsolete |
GB 12595-1990
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PDF similar to GB 12595-2008
Basic data | Standard ID | GB 12595-2008 (GB12595-2008) | | Description (Translated English) | Working chemical -- Silver nitrate | | Sector / Industry | National Standard | | Classification of Chinese Standard | G61 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 7,760 | | Date of Issue | 2008-06-18 | | Date of Implementation | 2009-06-01 | | Older Standard (superseded by this standard) | GB 12595-1990 | | Quoted Standard | GB/T 601; GB/T 602; GB/T 603; GB/T 6682; GB/T 9723-2007; GB/T 9724; GB 10737-2007; GB 15258; GB 15346; HG/T 3484; HG/T 3921 | | 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 Working chemical properties of silver nitrate, specifications, testing, inspection and marking and packaging rules. This standard applies to Working chemical titration with silver nitrate test. | GB 12595-2008: Working chemical -- Silver nitrate---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.
Working chemical.Silver nitrate
ICS 71.040.30
G61
National Standards of People's Republic of China
Replacing GB 12595-1990
Working Standard reagent silver nitrate
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, 5.2.1 and 5.2.2 are mandatory, other provisions are recommended.
This standard replaces GB 12595-1990 "job reference reagent (capacity) of silver nitrate," major changes compared with the GB 12595-1990
as follows.
--- Standard name was changed to "work reference reagent silver nitrate";
--- Modify the Content Measurement (1990 version 4.1, this version 5.3);
--- Project Name "reaction solution" to "pH value" (the 1990 edition 3.3,4.3, 4,5.4 this edition);
--- Modified iron, copper, determination of lead (4.4.6,4.4.7,4.4.8 the 1990 edition, this edition 5.10,5.11,5.12) ;
--- Abolition of the "standard solution formulated Appendix A (Supplement)" (1990 edition Appendix A).
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.
The main drafters of this standard. Han Baoying, strong Jing Lin.
This standard replaces the standards previously issued as follows.
--- GB 12595-1977, GB 12595-1990.
Working Standard reagent silver nitrate
Warning. some of the test procedure specified in this standard can lead to dangerous situations, the user has the responsibility to take appropriate safety and health practices.
Formula. AgNO3
Molecular weight. 169.87 (according to 2005 international relative atomic mass).
1 Scope
This standard specifies the characteristics, specifications, testing, inspection rules, and packaging and marking work reference reagent silver nitrate.
This standard applies to titration analysis work reference reagent silver nitrate 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 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)
Determination of working reference reagent content GB 10737-2007 General Weighing potentiometric titration
GB 15258 rules for preparation of chemical safety labels
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 is colorless or white crystals, soluble in water, easily oxidized in air, protected from light, the case of organic black.
4 Specification
Silver nitrate as shown in Table 1.
Table 1
Name reference work
Content (AgNO3) /% 99.95 ~ 100.05
Appearance of compliance
pH value (50g/L, 25 ℃) 5.0 ~ 6.0
Clarity test, number ≤2
Loss on drying, /% ≤0.1
Table 1 (continued)
Name reference work
Hydrochloride does not precipitate, /% ≤0.005
Chloride (Cl), /% ≤0.0005
Sulfate (SO4), /% ≤0.002
Iron (Fe), /% ≤0.0002
Copper (Cu), /% ≤0.0005
Lead (Pb), /% ≤0.0005
5 Test
5.1 General provisions
Unless specified otherwise in this chapter, the use of the standard solution, preparations and products, according to GB/T 602, the provisions of the preparation of GB/T 603, the experimental
Water should be consistent with GB/T 6682 specifications in three water samples according to precise weighing 0.01g, the solution to the "%" are represented by quality
fraction.
5.2 Determination of content
Measured according to the provisions of GB 10737-2007.
GB 10737-2007 accordance with the provisions of Appendix A formulated.
5.2.2 Determination
Said take 0.5g sample was measured after drying loss to the nearest 0.00001g, placed in a reaction flask, dissolved in 70mL water, add 10mL lake
Powder solution (10g/L), with 216 type silver electrode as indicator electrode, 217 double salt bridge with a saturated calomel electrode (outer casing built saturated salt bridge
Potassium nitrate solution) as a reference electrode, with a standard solution of sodium chloride [Chou (NaCl) = 0.1mol/kg] titrated to the end point. Weighing the reference solution of sodium chloride
Quality liquid should be accurate to 0.0001g.
Silver nitrate content and its value is "%" means, according to equation (1).
(1)
Where.
Content b --- standard substance of sodium chloride (mass fraction), the value to "%" means;
--- The MG numerical molar mass of silver nitrate in grams per mole (g/mol) [M (AgNO3) = 169.87];
--- MB of standard numerical molar mass of sodium chloride material in grams per mole (g/mol) [M (NaCl) = 58.44].
Silver acid density is 4.45g/cm3.
5.3 Appearance
Colorless or white crystals, without dark.
According to GB/T 9724 provisions of the assay in which the reference electrode 217 double salt bridge with a saturated calomel electrode (outer casing built saturated nitrate salt bridge
Or ammonium nitrate solution).
5.5 Clarity test
Weigh 10g sample was dissolved in 100mL of water, add 0.1mL solution of nitric acid (25%), shaken, turbidity is not greater than HG/T 3484
Clarity No. 2 standard stipulated.
5.6 Loss on drying
Weigh 5.5g sample to the nearest 0.0001g, it has been placed in the weighing bottle constant in sulfuric acid dryer, drying in the sulfuric acid desiccator
To constant weight. Samples retained after constant for determination.
Loss on drying mass fraction of 1, the value in the "%" means, according to equation (2).
100 (2)
Where.
5.7 hydrochloric acid does not precipitate
25g samples were weighed, dissolved in 200mL of water (25%) nitric acid solution was added 0.25mL, diluted to 250mL, dissolved nitrate added 4mL
Solution (25%), diluted to 400mL, boiled, with stirring was added dropwise a solution of 30mL of hydrochloric acid (20%), heated on a water bath, and stirring was continued until
Curd-like precipitate to form larger particles. Is ± 2 ℃ at 105 ℃ in dark for 2h, diluted to 500mL, filter, take 400mL, placed
The constant evaporating dish, evaporated to dryness at 105 ℃ ± 2 ℃ in an electric oven dried to constant weight. While doing the blank test. Sample residue and blank
The residue of the poor quality of the test shall not exceed 1.0mg.
5.8 Chloride
5.8.1 Preparation of chloride-free silver nitrate solution
Weigh 10g sample was dissolved in 80mL of water, add 5mL nitric acid, diluted to 100mL, shake, in the dark place for 10min, chlorine-free
Filter paper.
5.8.2 Determination
Weigh 2g sample was dissolved in 20mL water, 1mL plus nitric acid, diluted to 25mL, shake, in the dark place for 10min. Solution
Turbidity was no larger than a standard turbidity solution.
Preparation of standard turbidity solution is to take the silver nitrate solution 20mL chloride free and contains 0.01mg chloride (Cl) standard solution,
Diluted to 25mL, and the same volume of test solution placed simultaneously 10min, turbidity.
5.9 sulfate
1g sample was weighed, dissolved in 20mL of water, add 0.5mL acetic acid solution (30%) was acidified.
The 0.25mL ethanol solution of potassium sulfate (0.2g/L) and 1mL of saturated barium nitrate solution was mixed (seed liquid), accurate placement 1min.
Added to the test solution has been acidified, diluted to 25mL, shake for 5min. The turbidity of the solution was not greater than the standard turbidity solution.
Standard preparation turbid solution is to take the ratio of 0.02mg containing sulfate (SO4) standard solution, and treated in the same sample at the same time.
5.10 Iron
Determined according to the provisions of GB/T 9723-2007 of.
5.10.1 instrument conditions.
Source. iron hollow cathode lamp;
Wavelength. 248.3nm;
Flame. acetylene - air.
5.10.2 Determination
25g samples were weighed, dissolved in 20mL of water was added dropwise with constant stirring ascorbic acid solution (400g/L) to complete precipitation of
(Approximately 60mL), stirring was continued for 10min, filtered, washed with a solution of ascorbic acid (10g/L) residue was washed, and the filtrate was diluted to 100mL, taking
20mL, a total of four, without a standard solution, two, three, four proportional standard solution was added, diluted to 25mL, transferred to the blank solution
zero. According to the provisions of GB/T 9723-2007 7.2.2 measurement results calculated according to the provisions of 7.2.3.
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