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GB 6853-2008 English PDF

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GB 6853-2008: pH primary reagent -- Potassium dihydrogen phosphate
Status: Valid

GB 6853: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 6853-2008	English	139	Add to Cart	3 days [Need to translate]	pH primary reagent -- Potassium dihydrogen phosphate	Valid	GB 6853-2008
GB 6853-1986	English	199	Add to Cart	2 days [Need to translate]	pH Basic line--Potassium dihydrogen phosphate	Obsolete	GB 6853-1986

PDF similar to GB 6853-2008

Standard similar to GB 6853-2008

HG/T 3489 GB/T 6682 GB/T 6684 GB 6856 GB 6857 GB 6854

Basic data

Standard ID	GB 6853-2008 (GB6853-2008)
Description (Translated English)	pH primary reagent -- Potassium dihydrogen phosphate
Sector / Industry	National Standard
Classification of Chinese Standard	G61
Classification of International Standard	71.040.30
Word Count Estimation	6,688
Date of Issue	2008-12-31
Date of Implementation	2009-06-01
Older Standard (superseded by this standard)	GB 6853-1986
Quoted Standard	GB/T 601; GB/T 602; GB/T 603; GB/T 610-2008; GB/T 6682; GB 6851; GB/T 9723-2007; GB/T 9724; GB/T 9725; GB/T 9732; GB/T 9735; GB/T 9738; GB 15346; HG/T 3484; HG/T 3921
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 reference reagent potassium dihydrogen phosphate pH characteristics, specifications, testing, inspection and marking and packaging rules. This standard applies to the reference reagent potassium dihydrogen phosphate pH test.

GB 6853-2008: pH primary reagent -- Potassium dihydrogen phosphate

---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.
pH primary reagent.Potassium dihydrogen phosphate ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 6853-1986 Posted 2008-12-31 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 are mandatory, other provisions are recommended. This standard replaces GB 6853-1986 "pH reference reagent potassium dihydrogen phosphate," compared with GB 6853-1986 The main changes are as follows. --- PH (S) Ⅱ value (0.025mol/kg, 25 ℃) by the "pH (S) Ⅱ = pH (S) Ⅰ ± 0.005" adjusted "pH (S) Ⅱ = pH (S) ⅰ ± 0.01 " (1986 version 1.1, the first edition chapter 4); --- Project Name "reaction solution" to "pH value" (1986 version 2.3, this version 5.5); --- Adjust the amount of water-insoluble sampling (1986 version 2.4.2, this version 5.7); --- PH value, water insoluble, salt, heavy metals and chemical reagents common method to switch to four measurement (1986 edition 2.3,2.4.2, 2.4.7,2.4.11, this edition 5.5,5.7,5.12,5.16). 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, China Institute of Metrology. The main drafters of this standard. Han Baoying, repair Hongyu. This standard was first published in 1986. Molecular formula. KH2PO4 Molecular weight. 136.09 (according to 2007 international relative atomic mass)

1 Scope

This standard specifies the reference reagent potassium dihydrogen phosphate pH trait, specifications, testing, packaging and inspection rules and signs. This standard applies to the reference reagent potassium dihydrogen phosphate pH 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 610-2008 Chemical Reagent Determination of Arsenic in the general method (ISO 6353-1. 1982, NEQ) GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) GB 6851 pH value reference reagent General 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 9725 General Chemical Reagents potentiometric titration (GB/T 9725-2007, ISO 6353-1. 1982, NEQ) GB/T 9732 General method for the determination of ammonium Chemicals (GB/T 9732-2007, ISO 6353-1. 1982, NEQ) GB/T 9735 General method for determination of heavy metals Chemicals (GB/T 9735-2008, ISO 6353-1. 1982, NEQ) GB/T 9738 Chemicals water insoluble determination General method (GB/T 9738-2008, ISO 6353-1. 1982, NEQ) 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 crystals, soluble in water, soluble in alcohol.

4 Specification

Potassium dihydrogen phosphate as shown in Table 1. Table 1 Name pH reference Mixed phosphate pH of the solution (S) Ⅱ value (0.025mol/kg, 25 ℃) pH (S) Ⅱ = pH (S) Ⅰ ± 0.01 Content (KH2PO4), /% ≥99.5 pH (50g/L, 25 ℃) 4.2 ~ 4.6 Clarity test/number ≤2 Water-insoluble, /% ≤0.002 Loss on drying, /% ≤0.2 Chloride (Cl), /% ≤0.001 Sulfate (SO4), /% ≤0.002 Nitrate (NO3), /% ≤0.002 Ammonium (NH4), /% ≤0.001 Sodium (Na), /% ≤0.02 Iron (Fe), /% ≤0.001 Arsenic (As), /% ≤0.0005 Heavy metals (Pb), /% ≤0.001 Ammonia precipitate, /% ≤0.005

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. Determined according to the provisions of GB 6851 using a platinum electrode dihydrotestosterone. Mixed phosphate pH of the solution (S) Ⅰ (0.025mol/kgKH2PO4, 0.025mol/kgNa2HPO4) certificate by the standard substance used to look up. 5.4 Content Weigh 4g sample, accurate to 0.0001g. No carbon dioxide dissolved in 100mL of water, determined according to the provisions of GB/T 9725, with the Sodium hydroxide standard titration solution [Ba (NaOH) = 1mol/L] titrated to a pH value of 9.1 as the end point. The mass fraction of potassium dihydrogen phosphate 1, the value in the "%" means, according to equation (1). 100 (1) Where. Value Vp --- sodium hydroxide standard titration solution volume in milliliters (mL); Accurate Ba --- sodium hydroxide standard titration solution concentration value in units of moles per liter (mol/L); --- The M potassium dihydrogen phosphate numerical molar mass in grams per mole (g/mol) [M (KH2PO4) = 136.1]; Determined according to the provisions of GB/T 9724's. 5.6 Clarity test Clarity Standard No. 2 Weigh 20g sample was dissolved in 100mL of water, turbidity is not greater than HG/T 3484 stipulated. 5.7 Water insoluble matter Weigh 50g sample was dissolved in 250mL of water in the water bath for 1h after, according to the provisions of GB/T 9738 Determination. 5.8 Loss on drying Weigh 2g sample, accurate to 0.0001g, has been placed in a sulfuric acid desiccator to constant weighing bottle, sulfuric acid desiccator Dried to a constant. Loss on drying mass fraction of 2, the value in the "%" means, according to equation (2). 100 (2) Where. 5.9 Chloride Weigh 1g sample was dissolved in 25mL of water, add 2mL nitric acid (25%) and 1mL silver nitrate (17g/L), shake for 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. 5.10 sulphate Weigh 0.5g sample was dissolved in 10mL water, add 5mL "Ethanol (95%)," at 1mL hydrochloric acid solution (10%), constantly shaking Dropping 3mL barium chloride solution (250g/L), diluted to 25mL, shake, place 10min. Turbidity can not be larger than the standard turbidity solution was 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. 5.11 Nitrate Weigh 0.5g sample was dissolved in 10mL of water, add 1mL sodium chloride solution (100g/L) and indigo carmine solution 1mL [Ba (C16H8N2Na2O8S2) = 0.001mol/L], with shaking in the 10s ~ 15s added 10mL sulfuric acid, placed 10min. Solution The blue shall not be lighter than the standard colorimetric solution. Preparation of standard color solution is to take the ratio of 0.01mg containing nitrate (NO3) standard solution, and treated in the same sample at the same time. 5.12 salts Weigh 1g sample was dissolved in water and diluted to 75mL after, according to the provisions of GB/T 9732 Determination. The solution can not be deeper than the standard yellow Colorimetric solution. Preparation of the standard developing solution containing 0.01mg ratio is taken of ammonium (NH4) standard solution, the same treatment simultaneously with the sample. 5.13 Sodium Determined according to the provisions of GB/T 9723-2007 of. 5.13.1 Instrument Conditions Source. sodium hollow cathode lamp; Wavelength. 589.0nm; Flame. acetylene - air. 5.13.2 Determination Weigh 1g sample was dissolved in water and diluted to 100mL. Take 10mL, a total of four. According to the provisions of GB/T 9723-2007 in 7.2.2 Measurement results calculated according to the provisions of 7.2.3. 5.14 Iron Weigh 1g sample was dissolved in 20mL of water, add 2mL dihydrate, 5-sulfosalicylic acid solution (100g/L), shake, add 5mL ammonia (10%) solution, shake. The yellow solution can not be deeper than the standard colorimetric solution. Book GB 6853-2008 Preparation of the standard solution is to take the colorimetric containing 0.01mg of iron (Fe) standard solution, the same treatment simultaneously with the sample. 5.15 Arsenic Weigh 0.5g sample was dissolved in 70mL water, measured by the GB/T 610-2008 4.1 requirements. Brown mercuric bromide paper that was No deeper than the standard colorimetric test strips. Standard color strip ratio is prepared to take 0.0025mg containing arsenic (As) standard solution, and treated in the same sample at the same time. 5.16 Heavy Metal Weigh 2g 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. 5.17 ammonia precipitate Weigh 15g sample was dissolved in 100mL of water (filtered if necessary), add ammonia 10mL, shake and let stand 12h ~ 18h, filtered, washed with hot Ammonium nitrate solution (20g/L) to wash the filter residue was washed free potassium ion reactions, drying, charring, burning to constant weight at 800 ℃ ± 50 ℃. While doing Blank test. Poor quality of the residue sample and blank test must be less than 0.75mg.

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. Inner packaging. NB-4, NB-5; Packaging forms. WB-1; Packing unit. Class 3, Class 4, Class 5.

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