GB 1253-2007 English PDF

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GB 1253-2007: Working chemicals -- Sodium chloride
Status: Valid

GB 1253: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 1253-2007	209	Add to Cart	3 days	Working chemicals -- Sodium chloride	Valid
GB 1253-1989	279	Add to Cart	3 days	Working chemical--Sodium chloride	Obsolete

Similar standards

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

Basic data

Standard ID: GB 1253-2007 (GB1253-2007)
Description (Translated English): Working chemicals -- Sodium chloride
Sector / Industry: National Standard
Classification of Chinese Standard: G61
Classification of International Standard: 71.040.30
Word Count Estimation: 8,858
Date of Issue: 2007-10-25
Date of Implementation: 2008-04-01
Older Standard (superseded by this standard): GB 1253-1989
Quoted Standard: GB/T 601; GB/T 602; GB/T 603; GB/T 609; GB/T 6682; GB/T 9723-2007; GB/T 9724; GB/T 9727; GB/T 9728; GB/T 9735; GB/T 9738; GB/T 9739; GB 10737; GB 15346; HG/T 3484; HG/T 3921
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 chloride traits, specifications, testing, inspection and marking and packaging rules. This standard applies to the titration analysis Working chemical sodium chloride test.

GB 1253-2007: Working chemicals -- Sodium chloride

---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 chemicals-Sodium chloride ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 1253-1989 Working Standard Reagent Sodium Chloride 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 1253-1989 "work reference reagent (capacity) sodium chloride", the main changes compared with the GB 1253-1989 as follows. --- Standard name was changed to "work reference reagent sodium chloride"; --- Modify the Content Measurement (before version 4.1, this version 5.3); --- PH value, water-insoluble, sulfate, total nitrogen, phosphate, iron, and the use of heavy metals in seven general method for the determination of chemical reagents (The previous version of 4.2,4.3.2,4.3.5,4.3.6,4.3.7,4.3.12,4.3.14, edition 5.4 , 5.6,5.9,5.10,5.11, 5.16,5.18). 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 1989 the first amendment. Working Standard Reagent Sodium Chloride Molecular formula. NaCl Molecular Weight. 58.443 (according to 2003 international relative atomic mass)

1 Scope

This standard specifies the characteristics, specifications, testing, inspection rules, and packaging and marking work on benchmarks agent --- sodium chloride. This standard applies to the reference reagent titration analysis work --- sodium chloride 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 9727 General method for the determination of phosphate chemical reagent (GB/T 9727-2007, 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 9735 General method for determination of heavy metals Chemicals (GB/T 9735-1988, eqv ISO 6353-1. 1982) GB/T 9738 Determination of water insoluble chemical reagent - General method (GB/T 9738-1988, eqv ISO 6353-1. 1982) GB/T 9739 General method for determination of iron chemical reagents (GB/T 9739-2006, ISO 6353-1. 1982, NEQ) Determination of working reference reagent content GB 10737 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 is a white crystalline powder, soluble in water, almost insoluble in ethanol.

4 Specification

Sodium chloride as shown in Table 1. Table 1 NaCl specifications Name reference work Content (NaCl), /% 99.95 ~ 100.05 pH value (50g/L, 25 ℃) 5.0 ~ 8.0 Table 1 (continued) Name reference work Clarity test, number ≤2 Water-insoluble, /% ≤0.003 Iodide (I), /% ≤0.001 Bromide (Br), /% ≤0.005 Sulphate (SO4), /% ≤0.001 Total nitrogen (N), /% ≤0.0005 Phosphate (PO4), /% ≤0.0005 Hexacyanoferrate (Ⅱ) salt [to Fe (CN) 6 meter], /% ≤0.0001 Magnesium (Mg), /% ≤0.001 Potassium (K), /% ≤0.01 Calcium (Ca), /% ≤0.002 Iron (Fe), /% ≤0.0001 Barium (Ba), /% ≤0.001 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. 5.3 Content Measured according to the provisions of GB 10737. 5.3.1 standard silver nitrate titration solution of sodium chloride titration Standards Weigh 0.15g at 500 ℃ ~ 600 ℃ to constant burning standard substance sodium chloride, accurate to 0.00001g. Placed in a reaction flask, Add water to dissolve 70mL, 10mL add starch indicator solution (10g/L), sulfur ion selective electrode (or silver electrode) as the indicator electrode with a 217 type Double salt bridge saturated calomel electrode (outer casing salt bridge built saturated ammonium nitrate or potassium nitrate solution) as a reference electrode. Titration with standard silver nitrate solution [Ba (AgNO3) = 0.1mol/L] titrated to the end point. Weighing standard silver nitrate titration solution should be accurate to 0.0001g. Determination 5.3.2 Content 5.3.1 Determination of the same, instead of the standard sample material. The mass fraction of sodium chloride and its value is "%" means, according to equation (1). (1) Where. Content b --- standard substance of sodium chloride (mass fraction), the value to "%" means; Determined according to the provisions of GB/T 9724's. 5.5 Clarity test Clarity Standard No. 2 Weigh 25g sample was dissolved in 100mL of water, turbidity is not greater than HG/T 3484 stipulated. 5.6 Water insoluble matter Weigh 50g sample was dissolved in 200mL of water in the water bath for 1h after, according to the provisions of GB/T 9738 Determination. 5.7 iodide 11g samples were weighed, dissolved in water 50mL, transferred to a separatory funnel, add 2mL of hydrochloric acid and 5mL ferric chloride solution (100g/L), Shake for 5min. Add 10mL of carbon tetrachloride, shaking 1min, place stratification, carbon tetrachloride layer was collected in colorimetric tube, and then each time with 5mL carbon tetrachloride extracted twice, into the colorimetric tube (reservations aqueous sample). The organic layer was purple No deeper than the standard colorimetric solution. Preparation of standard color solution is to take the ratio of 1g sample and containing 0.1mg of iodine (I) and a standard solution containing 0.5mg of bromine (Br) standard solution, The same treatment simultaneously with the sample (standard water retention). 5.8 bromide The aqueous sample 5.7 carved funnel to retain each extracted twice with 5mL carbon tetrachloride, carbon tetrachloride discarded, in solution Add 35mL sulfuric acid solution (1 + 1) and 10mL chromic acid solution (100g/L), shake for 5min. Add 10mL of carbon tetrachloride, shaking 1min, place stratification. Carbon tetrachloride layer was collected in colorimetric tube, and then 5mL carbon tetrachloride extraction, into a colorimetric tube. The organic layer was Yellow No deeper than the standard colorimetric solution. Preparation of standard color solution is to take the ratio of the standard solution 5.7 with an aqueous solution of 5.8 to retain the specimen while the same treatment. 5.9 sulfate Weigh 1g sample was dissolved in 20mL of water, add 0.5mL hydrochloric acid solution (20%) after acidification, according to the provisions of GB/T 9728 Determination. The turbidity of the solution was not greater than the standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.01mg containing sulfate (SO4) standard solution, and treated in the same sample at the same time. Total nitrogen content of 5.10 Weigh 2g sample was dissolved in water and diluted to 140mL, determined according to the provisions of GB/T 609's. The yellow solution can not be deeper than the standard ratio Color solution. Preparation of the standard developing solution containing 0.01mg ratio is taken of nitrogen (N) standard solution, the same treatment simultaneously with the sample. 5.11 Phosphate Weigh 1g sample was dissolved in an appropriate amount of water, add 2 drops of saturated 2,4-dinitrophenol indicator solution, a solution of nitric acid solution (13%) just to yellow Disappeared after diluted to 10mL, according to the provisions of GB/T 9727 Determination. The organic layer was blue can not be deeper than the standard colorimetric solution. Preparation of the standard developing solution containing 0.005mg is to take the ratio of phosphate (PO4) standard solution, the same treatment simultaneously with the sample. 5.12 hexacyanoferrate (Ⅱ) salt Weigh 3.5g sample was dissolved in 12mL of water, add 0.2mL sulfuric acid solution (20%), plus 0.2mL iron - ferrous mixture, shake, Place 2min. Add 1mL sodium dihydrogen phosphate solution (200g/L), shake for 30min. The solution can not be deeper than the standard blue colorimetric Solution. Preparation of standard color solution is to take the ratio of 1g sample containing 0.0025mg and the hexacyanoferrate (Ⅱ) salt [Fe (CN) 6] standard solution, and Sample while the same treatment. 5.13 Magnesium Determined according to the provisions of GB/T 9723-2007 of. 5.13.1 Instrument Conditions Source. magnesium hollow cathode lamp; Wavelength. 285.2nm; Flame. acetylene - air. 5.13.2 Determination Weigh 10g sample is dissolved in water and diluted to 100mL. Take 10mL, 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. 5.14 K Determined according to the provisions of GB/T 9723-2007 of. 5.14.1 Instrument Conditions Source. Potassium hollow cathode lamp; Wavelength. 766.5nm; Flame. acetylene - air. 5.14.2 Determination With 5.13.2. 5.15 Calcium Determined according to the provisions of GB/T 9723-2007 of. 5.15.1 Instrument Conditions Source. calcium hollow cathode lamp; Wavelength. 422.7nm; Flame. acetylene - air. 5.15.2 Determination Weigh 10g sample is 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. 5.16 Iron 3g weighed sample was dissolved in 15mL water, with hydrochloric acid solution (15%) the pH of the solution was adjusted to 2, according to GB/T 9739 regulations Fixed determination. The red solution should not be deeper than the standard colorimetric solution. Preparation of the standard solution is to take the colorimetric containing 0.003mg of iron (Fe) standard solution, the same treatment simultaneously with the sample. 5.17 Barium 5.17.1 Preparation of test preparation Accurately weighed 0.02g barium chloride, dissolved in 100mL ethanol solution (3 + 7). Take 2.5mL and 10mL sodium sulfate (Na2SO4 · 10H2O) solution (400g/L) were mixed accurately placed 1min (mixed before use). 5.17.2 Determination 1g sample was weighed, dissolved in water and diluted to 20mL, add 0.5mL hydrochloric acid solution (20%). Was added to 1.25mL test preparation Diluted to 25mL, shake for 5min. The turbidity of the solution was not greater than the standard turbidity solution. Preparation of the standard solution is to take the turbidimetric containing 0.01mg of barium (Ba) standard solution, the same treatment simultaneously with the sample. 5.18 Heavy Metal Weigh 4g sample was dissolved in water and diluted to 20mL. Take 15mL, according to the provisions of GB/T 9735 Determination. The solution can not be dimmed Deeper than the standard colorimetric solution. 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 sample 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. Packing unit. Class 3; Inner packaging. NB-4, NB-5, NB-6; Packaging forms. The specifications for the 600g/m2 of box board paper box, outer mounted electro-optical purple paper. ......

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