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GB 1254-2007 English PDF

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GB 1254-2007: Working chemical -- Sodium oxalate
Status: Valid

GB 1254: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 1254-2007	English	189	Add to Cart	3 days [Need to translate]	Working chemical -- Sodium oxalate	Valid	GB 1254-2007
GB 1254-1990	English	239	Add to Cart	2 days [Need to translate]	Working chemical--Sodium oxalate	Obsolete	GB 1254-1990

PDF similar to GB 1254-2007

Standard similar to GB 1254-2007

HG/T 3489 GB/T 1282 HG/T 3484 GB 1258 GB 1260 GB 1256

Basic data

Standard ID	GB 1254-2007 (GB1254-2007)
Description (Translated English)	Working chemical -- Sodium oxalate
Sector / Industry	National Standard
Classification of Chinese Standard	G61
Classification of International Standard	71.040.30
Word Count Estimation	7,793
Date of Issue	2007-10-25
Date of Implementation	2008-04-01
Older Standard (superseded by this standard)	GB 1254-1990
Quoted Standard	GB/T 602; GB/T 603; GB/T 609; GB/T 6682; GB/T 9723-2007
Regulation (derived from)	China Announcement of Newly Approved National Standards No. 11 of 2007 (total 111)
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 sodium oxalate traits, specifications, testing, inspection and marking and packaging rules. This standard applies to the titration analysis Working chemical sodium oxalate test.

GB 1254-2007: Working chemical -- Sodium oxalate

---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.Sodium oxalate ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 1254-1990 Working Standard reagent sodium oxalate Posted 2007-10-25 2008-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard Chapter 4, 5.3.1,5.3.2 mandatory, other provisions are recommended. This standard replaces GB 1254-1990 "work reference reagent (capacity) sodium oxalate", the main changes compared with the GB 1254-1990 as follows. --- Standard name to "work reference reagent sodium oxalate"; --- 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. Participated in the drafting of this standard. Guangdong Guanghua Chemical Factory Co., Ltd. The main drafters of this standard. Han Baoying, strong Jing Lin, Wang Yuhua, Chenhan Zhao. This standard was first published in 1977, in 1990 the first amendment. Working Standard reagent sodium oxalate Molecular formula. Na2C2O4 Molecular weight. 134.00 (according to 2003 international relative atomic mass)

1 Scope

This standard specifies the operating reference reagent --- sodium oxalate traits, specifications, testing, packaging and inspection rules and signs. This standard applies to the reference reagent titration analysis work --- sodium oxalate 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 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 6682-1992, neq ISO 3696. 1987) 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 9728 General method for determination of chemical reagents sulfate (GB/T 9728-2007, ISO 6353-1. 1982, NEQ) GB/T 9737 Determination of chemical reagents easily carbonized substances General (GB/T 9737-1988, eqv ISO 6353-1. 1982) GB 10738 Job reference reagent titration Determination General Weighing 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 a white crystalline powder, soluble in water, soluble in ethanol.

4 Specification

Sodium oxalate as shown in Table 1. Table 1 specifications of sodium oxalate Name reference work Content (Na2C2O4), /% 99.95 ~ 100.05 pH value (30g/L, 25 ℃) 7.5 ~ 8.5 Clarity test, number ≤2 Loss on drying, /% ≤0.01 Table 1 (continued) Name reference work Chloride (Cl), /% ≤0.001 Sulfur compounds (of SO4), /% ≤0.002 Total nitrogen (N), /% ≤0.001 Potassium (K), /% ≤0.005 Iron (Fe), /% ≤0.0005 Heavy metals (Pb), /% ≤0.001 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 GB 10738 requirements. 5.3.1 standard titration solution of potassium permanganate titration standard substance sodium oxalate Weigh 0.2g to (105 ± 2) ℃ dried to a constant standard substance sodium oxalate and precise to 0.00001g. Placed in a reaction flask, dissolved in 100mL sulfuric acid solution (80mL/L), titration with potassium permanganate standard solution [Ba (15KMnO4 ) = 0.1mol/L] titration, plus near the end point Heat to 65 ℃, continue titration until the solution was pink, and maintain 30s. Weighing potassium permanganate standard titration solution should be accurate to 0.0001g. Determination 5.3.2 Content 5.3.1 Determination of the same, with the measurement sample instead of the standard material loss after drying. Sodium oxalate mass fraction of 1, the value in the "%" means, according to equation (1). (1) Where. B --- material content standard sodium oxalate (mass fraction), the value to "%" means; 3g weighed sample was dissolved in 100mL of carbon dioxide-free water, determined according to the provisions of GB/T 9724's. 5.5 Clarity test Weigh 4g sample was dissolved in 100mL hot water. Turbidity is not greater than HG/T 3484 standard specified in the 2nd clarity. 5.6 Loss on drying Weigh 10g sample, accurate to 0.0001g, has been placed in (105 ± 2) ℃ constant weighing bottle, at (105 ± 2) ℃ in an electric oven Dried to a constant weight. Samples retained after constant for determination. Loss on drying 2, the value in the "%" means, according to equation (2). 100 (2) Where. 5.7 Chloride Weigh 1g sample was dissolved in 20mL water and 8mL nitric acid solution (25%), add 1mL silver nitrate solution (17g/L), shake well and let Set 10min. The turbidity of the solution was not greater than the standard turbidity solution. Preparation of the standard solution is to take the turbidimetric 0.01mg containing chloride (Cl) standard solution, the same treatment simultaneously with the sample. 5.8 sulfur compounds Weigh 1g sample was placed in an evaporating dish, add 2mL water, nitric acid and 2mL 2mL "30% hydrogen peroxide", covered with a watch glass, in a water bath The insulation 1h, evaporated to dryness. Plus a small amount of water dissolved, 6mL hydrochloric acid solution (20%), and evaporated to dryness. The residue was dissolved in 10mL of water (if necessary through Filter), diluted to 20mL, determined according to the provisions of GB/T 9728's. 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 was diluted to 20mL, at the same time with the same volume of test solution The same treatment. 5.9 total nitrogen content Weigh 1g sample, add 100mL water, heat gently to dissolve, cooled, diluted to 140mL, determined according to the provisions of GB/T 609's. Solution Yellow No deeper than the standard colorimetric solution. Preparation of the standard developing solution containing 0.01mg ratio is taken of nitrogen (N) standard solution was diluted to 140mL, at the same time with the same volume of sample solution The same treatment. 5.10 K Determined according to the provisions of GB/T 9723-2007 of. 5.10.1 Instrument Conditions Source. Potassium hollow cathode lamp; Wavelength. 766.5nm; Flame. acetylene - air. 5.10.2 Determination Weigh 1g sample, add 100mL water, heat gently to dissolve, cooled. Take 20mL, a total of four copies, according to GB/T 9723-2007 7.2.2 The provisions of the determination, the results calculated according to the provisions of 7.2.3. 5.11 Iron Weigh 1g sample, add water, 30mL, micro-heat to dissolve, add 2mL sulfosalicylic acid solution (100g/L), shake, add 5mL ammonia solution Solution (10%) and shake. The yellow solution can not be deeper than the standard colorimetric solution. Preparation of the standard solution is to take the colorimetric containing 0.005mg of iron (Fe) standard solution, the same treatment simultaneously with the sample. 5.12 Heavy Metal Weigh 2g sample was placed in an evaporating dish, add 2mL water, nitric acid and 2mL 2mL "30% hydrogen peroxide", covered with a watch glass, in a water bath The insulation 1h, evaporated, add 4mL solution of nitric acid (1 + 1), then evaporated to dryness. The residue was dissolved in water, neutralized with aqueous ammonia solution (10%) adjusting pH of the solution To 4, diluted to 40mL. Take 30mL, add 0.2mL acetic acid solution (30%) and 10mL saturated aqueous hydrogen sulfide freshly prepared, shake, put Set 10min. The solution was dark can not be deeper than the standard colorimetric solution. Preparation of standard color solution is to take over the remaining 10mL test solution containing 0.01mg and lead (Pb) standard solution was diluted to 30mL, and With the same volume of the test solution treated simultaneously. 5.13 Easy carbonized substance Weigh 1g sample was placed in an evaporating dish, add 10mL sulfuric acid (excellent pure, 95% ± 0.5%), sulfuric acid heated to steam began to escape the cold

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