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GB 12597-2008 English PDF

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GB 12597-2008: Working chemical -- Benzoic acid
Status: Valid

GB 12597: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 12597-2008	English	169	Add to Cart	3 days [Need to translate]	Working chemical -- Benzoic acid	Valid	GB 12597-2008
GB 12597-1990	English	239	Add to Cart	2 days [Need to translate]	Working chemical--Benzoic acid	Obsolete	GB 12597-1990

PDF similar to GB 12597-2008

Standard similar to GB 12597-2008

GB/T 9722 HG/T 3489 GB/T 9741 GB 12595 GB 12596 GB 12594

Basic data

Standard ID	GB 12597-2008 (GB12597-2008)
Description (Translated English)	Working chemical -- Benzoic acid
Sector / Industry	National Standard
Classification of Chinese Standard	G61
Classification of International Standard	71.040.30
Word Count Estimation	7,738
Date of Issue	2008-06-18
Date of Implementation	2009-06-01
Older Standard (superseded by this standard)	GB 12597-1990
Quoted Standard	GB/T 601; GB/T 602; GB/T 603; GB/T 617; GB/T 6682; GB/T 9728; GB/T 9729; GB/T 9739; GB/T 9741-2008; GB 10737-2007; 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 acid traits, specifications, testing, inspection and marking and packaging rules. This standard applies to Working chemical titration with acid test.

GB 12597-2008: Working chemical -- Benzoic acid

---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.Benzoic acid ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 12597-1990 Benzoic acid reagent reference work 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, 5.3.1 and 5.3.2 are mandatory, other provisions are recommended. This standard replaces GB 12597-1990 "job reference reagent (capacity) benzoic acid", compared with GB 12597-1990, the major change Of the following. --- Standard name was changed to "work reference reagent acid"; --- Modify the Content Measurement (before version 4.1, this version 5.3). 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 12597-1977, GB 12597-1990. Benzoic acid reagent reference work Exemplary formula. C6H5COOH Molecular weight. 122.12 (according to 2005 international relative atomic mass).

1 Scope

This standard specifies the job reference reagent acid trait, specifications, testing, packaging and inspection rules and signs. This standard applies to titration analysis work reference reagent acid 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 617 chemical reagent melting range of common measurement method (GB/T 617-2006, 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 9728 General method for determination of chemical reagents sulfate (GB/T 9728-2007, ISO 6353-1. 1982, NEQ) GB/T 9729 General method for determination of chloride Chemicals (GB/T 9729-2007, 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/T 9741-2008 Determination of residue on ignition Chemicals General method (ISO 6353-1. 1982, NEQ) Determination of working reference reagent content GB 10737-2007 General Weighing potentiometric titration 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 flake or needle crystal, sublimation, insoluble in water, soluble in ethanol, ether and other organic solvents.

4 Specification

Benzoic acid as shown in Table 1. Table 1 Name reference work Content (C6H5COOH), /% 99.95 ~ 100.05 Melting range, ℃ 121.5 ~ 123.5 Clarity test, number ≤2 Residue on ignition (Sulfate), /% ≤0.01 Table 1 (continued) Name reference work Compound chlorine (Cl), /% ≤0.003 Sulfur compounds (of SO4), /% ≤0.003 Iron (Fe), /% ≤0.0004 Heavy metals (Pb), /% ≤0.0005 Potassium permanganate reducing substance (in O gauge), /% ≤0.008 Easy carbonized material qualified

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. 5.3 Content Measured according to the provisions of GB 10737-2007. 5.3.1 titration of sodium hydroxide standard titration solution of potassium hydrogen phthalate standard substance Weigh 0.5g at 105 ℃ ~ 110 ℃ drying to constant standard substance potassium hydrogen phthalate, accurate to 0.00001g, anti placed Should the bottle, no carbon dioxide dissolved in 30mL of water, add 4mL "ethanol (95%)," stirring from the manifold to the high purity nitrogen gas through the solution 10min, adjust the nitrogen intake pipe into the air, maintaining a small stream of nitrogen, with 231 glass electrode as indicator electrode, saturated with 232 Calomel electrode as the reference electrode, with a sodium hydroxide standard titration solution [Ba (NaOH) = 0.1mol/L] titrated to the end point. Weighing sodium hydroxide Standard Solution, should be accurate to 0.0001g. While doing the blank test. Determination 5.3.2 Content Weigh 0.3g of phosphorus pentoxide in a desiccator to constant sample of the nearest 0.00001g, placed in a reaction flask, is dissolved 4mL, add 30mL of carbon dioxide-free water, with subsequent determination of 5.3.1.5.3.1 and determination "of ethanol (95%)," 5.3.2 should Using the same set of electrodes. Benzoic acid content and its value is "%" means, according to equation (1). (1) Where. b --- Standards potassium hydrogen phthalate content (mass fraction), the value to "%" means; --- The MG acid value of molar mass in grams per mole (g/mol) [M (C6H5COOH) = 122.12]; In grams (g); Numerical MB --- Standard Substance potassium hydrogen phthalate molar mass in grams per mole (g/mol) [M (KHC8H4O4) = 204.21]. Acid density of 1.27g/cm3, potassium hydrogen phthalate density of 1.63g/cm3. 5.4 melting range Determined according to the provisions of GB/T 617's. 5.5 Clarity test Weigh 10g sample was dissolved in 80mL water and 20mL ammonia, turbidity is not greater than HG/T 3484 standard prescribed Clarity Quasi No. 2. 5.6 Residue on ignition Weigh 10g sample, determined according to the provisions of GB/T 9741-2008 4.2 The results calculated according to the provisions of Chapter 5. The residue was retained Iron determination. 5.7 chlorine compounds Weigh 1g sample was placed in a platinum crucible, add 5mL sodium carbonate solution (50g/L), mix, evaporated on a water bath heated carbonization, gradually And the temperature was raised to 700 ℃ burning to white, cooled, dissolved in hot water (filtered if necessary), with a solution of nitric acid (25%), diluted to 20mL, press The provisions of GB/T 9729 Determination. The turbidity of the solution was not greater than the standard turbidity solution. Preparation of the standard solution is to take the turbidimetric 0.03mg containing chloride (Cl) standard solution, the same treatment simultaneously with the sample. 5.8 sulfur compounds Weigh 2g sample was placed in a platinum crucible, add 10mL sodium carbonate solution (50g/L), mix, evaporated on a water bath heated carbonization, gradually Heated to 700 ℃ and burning to white. Cooled, dissolved in hot water (filtered if necessary), add 1mL "30% hydrogen peroxide", boiled hydrogen peroxide Decomposed with hydrochloric acid solution (20%) and and excess 0.5mL, then boiled, cooled, diluted to 20mL, according to the provisions of GB/T 9728 measured set. The turbidity of the solution was not greater than the standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.06mg containing sulfate (SO4) standard solution, and treated in the same sample at the same time. 5.9 iron In the determination of residue after ignition residue, add 3mL 1mL hydrochloric acid and nitric acid is dissolved, evaporated on a water bath, add 0.2mL hydrochloric acid and less The amount of water, warmed to dissolve and diluted to 50mL, take 5mL, was diluted to 15mL, with aqueous ammonia solution (10%) the pH of the solution was adjusted to pH 2, Determined according to the provisions of GB/T 9739's. The red solution should not be deeper than the standard colorimetric solution. Preparation of the standard developing solution containing 0.004mg is to take the ratio of iron (Fe) standard solution, add 0.1mL hydrochloric acid solution (10%), diluted to 15mL, with the same volume of the sample solution while the same treatment. 5.10 Heavy Metal Weigh 2g sample, add 20mL water, was added dropwise a solution of aqueous ammonia (10%) to dissolve the sample, diluted to 45mL, add 2mL thioacetamide Solution (50g/L) and 2mL sodium hydroxide solution (10g/L), shake for 10min. The solution was dark can not be deeper than the standard colorimetric Solution. Preparation of standard solutions than standard color solution containing 0.01mg of lead (Pb), was diluted to 45mL, and at the same time with the same volume of sample solution Sample processing. 5.11 potassium permanganate reducing substance Weigh 1g sample was added 100mL of water, heated to dissolve, add 20mL sulfuric acid solution (20%) and 0.1mL potassium permanganate standard titration solution Solution [Ba (1/5KMnO4) = 0.1mol/L], shake. The purple solution may not completely disappear. 5.12 Easy carbonized substance Weigh 0.1g sample in a dry colorimetric tube, add 2mL of sulfuric acid at 50 ℃ water bath while stirring, and kept 5min. versus There should be no comparison of blank dark production.

6 Inspection rules

According to the provisions of HG/T 3921 is sampled and acceptance.

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