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GB 12594-2008 English PDF

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GB 12594-2008: Working chemical -- Potassium bromate
Status: Valid

GB 12594: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 12594-2008	English	169	Add to Cart	3 days [Need to translate]	Working chemical -- Potassium bromate	Valid	GB 12594-2008
GB 12594-1990	English	239	Add to Cart	2 days [Need to translate]	Working chemical--Potassium bromate	Obsolete	GB 12594-1990

PDF similar to GB 12594-2008

Standard similar to GB 12594-2008

GB/T 9722 HG/T 3489 GB/T 9741 GB 12596 GB 12597 GB 12595

Basic data

Standard ID	GB 12594-2008 (GB12594-2008)
Description (Translated English)	Working chemical -- Potassium bromate
Sector / Industry	National Standard
Classification of Chinese Standard	G61
Classification of International Standard	71.040.30
Word Count Estimation	7,733
Date of Issue	2008-06-18
Date of Implementation	2009-06-01
Older Standard (superseded by this standard)	GB 12594-1990
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 potassium bromate, specifications, testing, inspection and marking and packaging rules. This standard applies to Working chemical titration with potassium bromate test.

GB 12594-2008: Working chemical -- Potassium bromate

---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.Potassium bromate ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 12594-1990 Working Standard reagent potassium bromate 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, Section 5.2.1 and 5.2.2 are mandatory, other provisions are recommended. This standard replaces GB 12594-1990 "job reference reagent (capacity) of potassium bromate" Compared with GB 12594-1990, the main changes as follows. --- Standard name was changed to "work reference reagent potassium bromate"; --- Modify the Content Measurement (1990 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 12594-1977, GB 12594-1990. Working Standard reagent potassium bromate 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. Molecular formula. KBrO3 Molecular weight. 167.00 (according to 2005 international relative atomic mass).

1 Scope

This standard specifies the operating reference reagent potassium bromate traits, specifications, testing, packaging and inspection rules and signs. This standard applies to titration analysis work reference reagent potassium bromate 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 6682-2008, ISO 3696. 1987, MOD) 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 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) 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 a white crystalline powder, soluble in water, almost insoluble in ethanol. And organics, sulfides or other reducing substances mixing and grinding, Violent explosion can occur.

4 Specification

Potassium bromate as shown in Table 1. Table 1 Name reference work Content (KBrO3), /% 99.90 ~ 100.10 pH (50g/L, 25 ℃) 5.0 ~ 7.0 Table 1 (continued) Name reference work Clarity test, number ≤2 Loss on drying, /% ≤0.1 Chloride and chlorate (as Cl dollars), /% ≤0.03 Bromide (Br), /% ≤0.005 Sulfate (SO4), /% ≤0.005 Total nitrogen (N), /% ≤0.001 Iron (Fe), /% ≤0.0005 Heavy metals (Pb), /% ≤0.0005

5 Test

5.1 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. 5.2 Content Measured according to the provisions of GB 10737-2007. 5.2.1 thiosulfate standard titration solution of potassium dichromate titration Standards Weigh 0.15g at 120 ℃ ± 2 ℃ drying to constant reference material potassium dichromate, and accurate to 0.00001g, placed in a reaction flask, It was dissolved in 25mL water. Add 2g of potassium iodide and 15mL sulfuric acid solution (20%). Shake, in the dark place 10min, add water 150mL (No more than 10 ℃), with 213 platinum electrode as the indicator electrode with a 212-type saturated calomel electrode as reference electrode, sodium thiosulfate standard droplet Given solution [Ba (Na2S2O3) = 0.1mol/L] titrated to the end point. Weighing sodium thiosulfate standard titration solution should be accurate to 0.0001g. While doing the blank test. Determination 5.2.2 Content Weigh 0.1g sample was measured after the loss on drying to the nearest 0.00001g, placed in a reaction flask, dissolved in 25mL water. Plus 3g of iodine Potassium and 5mL hydrochloric acid solution (20%). Shake, followed by the same measuring method and measuring 5.2.1.5.2.1 5.2.2, use the same Sets of electrodes. The mass fraction of potassium bromate, the value in the "%" means, according to equation (1). (1) Where. Content Wb --- potassium dichromate standard substance (mass fraction), the value to "%" means; Numerical MG --- potassium bromate molar mass in grams per mole (g/mol) [M (1/6KBrO3) = 27.83]; Numerical MB --- molar mass of potassium dichromate standard material in units of grams per mole (g/mol) [M (1/6K2Cr2O7) = 49.03]. Potassium density of 3.27g/cm3, potassium dichromate density of 2.69g/cm3. Determined according to the provisions of GB/T 9724's. 5.4 Clarity test Clarity Standard No. 2 Weigh 6g sample was dissolved in 100mL of water, turbidity is not greater than HG/T 3484 stipulated. 5.5 Loss on drying Weigh 1.5g sample, accurate to 0.0001g, has been placed in the weighing bottle at 180 ℃ ± 2 ℃ constant, the electricity in the 180 ℃ ± 2 ℃ Oven dried to constant weight. Samples retained after constant for determination. Loss on drying 1, the value in the "%" means, according to equation (2). 100 (2) Where. 5.6 Chloride and chlorate Weigh 1g sample was dissolved in 15mL of water was added dropwise sulfuric acid (about 20mL) to a solution of colorless, slowly heated to boiling 2min, excess Sulfur dioxide escapes, cooling, 50mL of nitric acid solution (25%), the solution was heated to colorless, washed with a little water bottle wall, heating was continued 15min, cooled, diluted to 100mL. Take 5mL, diluted to 20mL, determined according to the provisions of GB/T 9729's. The turbidity of the solution was not be Larger than the standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.015mg containing chloride (Cl) standard solution was diluted to 20mL, at the same time with the same volume of test solution The same treatment. 5.7 bromide 6g weighed sample was dissolved in 85mL of hot water, cooling, 0.5mL sulfuric acid solution (20%), shake for 30min. Solution Yellow No deeper than the standard colorimetric solution. Preparation of standard colorimetric solution containing 0.25mg is to take bromide (Br) standard solution and 1g sample, and the sample while the same treatment. 5.8 sulfate Weigh 1g sample, slowly added to 20mL hydrochloric acid solution (20%), evaporated on a water bath, plus 10mL hydrochloric acid solution (20%), steamed dry. The residue was dissolved in 20mL water, filtered, take 10mL, diluted to 20mL, determined according to the provisions of GB/T 9728's. The turbidity of the solution was No larger than a standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.025mg containing sulfate (SO4) standard solution was diluted to 20mL, and with the same volume of test solution When the same treatment. 5.9 total nitrogen content Weigh 1g 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. 5.10 Iron 5.10.1 Preparation of sample solution Weigh 5g sample was placed in an evaporating dish, add 35mL hydrochloric acid solution (20%) and 2 drops of sulfuric acid, in the steam bath to nearly dry, plus 10mL hydrochloric acid solution (20%), nearly evaporated to dryness and the residue was dissolved in water and diluted to 50mL. 5.10.2 Determination The amount of 10mL sample solution was diluted to 15mL, with aqueous ammonia solution (10%) and the solution was adjusted to pH 2, according to GB/T 9739 of Determination provisions. The red solution should not be deeper than the standard colorimetric solution. Book GB 12594-2008 Preparation of the standard developing solution containing 0.005mg is to take the ratio of iron (Fe) standard solution was added 9mL hydrochloric acid solution (20%) and 2 drops of sulfuric acid, Evaporated to near dryness on a water bath, diluted to 15mL, and with the same treatment at the same time the volume of the sample solution. 5.11 Heavy Metal Measure 30mL sample solution (5.10.1), with aqueous ammonia solution (10%) and the solution was adjusted to pH 4, added 0.2mL of acetic acid (30%) of freshly prepared saturated hydrogen sulfide and water 10mL, shake, place 10min. The solution was dark can not be deeper than the standard colorimetric solution. Preparation of standard color solution ratio of 10mL sample solution (5.10.1) containing 0.01mg and lead (Pb) standard solution was diluted to 30mL, while the volume of the sample solution with 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; Packaging forms. The specifications for the 600g/m2 of box board paper box, outer mounted electro-optical purple paper; Tags. according to the provisions of GB 15258, marked "oxidant."

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