GB 6857-2008 English PDF

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GB 6857-2008: pH primary reagent -- Potassium hydrogen phthalate
Status: Valid

GB 6857: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 6857-2008	139	Add to Cart	3 days	pH primary reagent -- Potassium hydrogen phthalate	Valid
GB 6857-1986	199	Add to Cart	2 days	pH Basic line--Potassium hydrogen phthalate	Obsolete

Similar standards

HG/T 3489   GB/T 6682   GB/T 6684   GB 6854   GB 6856   GB 6853   

Basic data

Standard ID: GB 6857-2008 (GB6857-2008)
Description (Translated English): pH primary reagent -- Potassium hydrogen phthalate
Sector / Industry: National Standard
Classification of Chinese Standard: G61
Classification of International Standard: 71.040.30
Word Count Estimation: 6,613
Date of Issue: 2008-12-31
Date of Implementation: 2009-06-01
Older Standard (superseded by this standard): GB 6857-1986
Quoted Standard: GB/T 601; GB/T 602; GB/T 603; GB 1257-2007; GB/T 6682; GB 6851; GB/T 9723-2007; GB/T 9729; GB/T 9732; GB/T 9738; GB/T 9739; GB 15346; HG/T 3484; HG/T 3921
Regulation (derived from): Announcement of Newly Approved National Standards No. 25 of 2008 (total 138)
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 pH potassium hydrogen phthalate traits, specifications, testing, inspection and marking and packaging rules. This standard applies to the reference reagent pH potassium hydrogen phthalate test.

GB 6857-2008: pH primary reagent -- Potassium hydrogen phthalate

---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 hydrogen phthalate ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 6857-1986 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 6857-1986 "pH potassium hydrogen phthalate reference reagent", compared with GB 6857-1986 major changes as follows. --- Standard name changed to "pH reference reagent potassium hydrogen phthalate"; --- PH (S) Ⅱ value (0.05mol/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); --- Modify the method for the determination (1986 version 2.2, this version 5.4); --- Canceled aqueous reaction (1986 edition 2.3); --- Clarity test from "1" to "2" (1986 version 2.4.1, this version 5.5); --- Adjust the water insoluble, loss on drying, sampling amount of sodium (2.4.2,2.4.3,2.4.7 1986 edition, this edition of 5.6,5.7, 5.11); --- Modify the chloride method of measuring iron (2.4.4,2.4.8 1986 edition, this edition 5.8,5.12); --- Ammonium chemical reagents common method of measuring switch (1986 version 2.4.6, this version 5.10). 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. C6H4CO2HCO2K Molecular weight. 204.22 (according to 2007 international relative atomic mass)

1 Scope

This standard specifies the reference reagent pH potassium hydrogen phthalate traits, specifications, testing, packaging and inspection rules and signs. This standard applies to pH reference reagent potassium hydrogen phthalate 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 1257-2007 work reference reagent potassium hydrogen phthalate 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 9729 General method for determination of chloride Chemicals (GB/T 9729-2007, 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 9738 Chemicals water insoluble determination General method (GB/T 9738-2008, 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 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 colorless or white crystalline powder, soluble in water.

4 Specification

Potassium hydrogen phthalate as shown in Table 1. Table 1 Name pH reference Potassium hydrogen phthalate pH of the solution (S) Ⅱ value (0.05mol/kg, 25 ℃) pH (S) Ⅱ = pH (S) Ⅰ ± 0.01 Content (C6H4CO2HCO2K), /% 99.95 ~ 100.05 Clarity test/number ≤2 Water-insoluble, /% ≤0.003 Loss on drying, /% ≤0.05 Chloride (Cl), /% ≤0.002 Sulfur compounds (of SO4), /% ≤0.006 Ammonium (NH4), /% ≤0.003 Sodium (Na), /% ≤0.005 Iron (Fe), /% ≤0.0005 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. According to the provisions of GB 6851 was measured using a palladium electrode dihydrotestosterone. Potassium hydrogen phthalate pH of the solution (S) Ⅰ value (0.05mol/kg, 25 ℃) certificate by the standard substance used to look up. 5.4 Content Determined according to the provisions of GB 1257-2007 5.3. 5.5 Clarity test Clarity Standard No. 2 Weigh 7.5g sample, add 100mL water dissolved by heating, turbidity shall not exceed HG/T 3484 stipulated. 5.6 Water insoluble matter Weigh 40g sample, add 400mL of water, heated and dissolved in the water bath for 1h, the determination according to the provisions GB/T 9738's. 5.7 Loss on drying Weigh 5g samples, accurate to 0.0001g, has been placed at 105 ℃ ~ 110 ℃ constant weighing bottle, at 105 ℃ ~ 110 ℃ of Electric oven dried to constant weight. Constant retention samples for determination. Loss on drying mass fraction of 1, the value in the "%" means, according to equation (1). 100 (1) Where. 5.8 Chloride 5g samples were weighed, dissolved in 30mL hot water, cooling, 10mL of nitric acid, filtered and diluted to 50mL. Take 10mL, press The provisions of GB/T 9729 Determination. The turbidity of the solution was not greater than the standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.02mg containing chloride (Cl) standard solution was diluted to 10mL, and at the same time with the same volume of test solution Sample processing. 5.9 sulfur compounds Weigh 0.5g sample was placed in a platinum crucible, add anhydrous sodium carbonate 0.2g, mixing, add 2mL water wet, evaporated on a water bath heated To completely carbonized, gradually warmed up to 700 ℃ and burning to white. As no white residue, add a small amount of cooling water wet, evaporated on a water bath, then blanch burn. Repeat this operation until the residue was completely white, cool, add water, 5mL dissolved (filtered if necessary) with hydrochloric acid (20%) and, dilute Diluted to 10mL, plus 5mL "ethanol (95%)", 0.5mL hydrochloric acid solution (20%), constantly shaking dropping 3mL barium chloride solution (250g/L), diluted to 25mL, shake, place 10min. The turbidity of the solution was not greater than the standard turbidity solution. Standard preparation turbid solution is to take the ratio of 0.03mg containing sulfate (SO4) standard solution, and treated in the same sample at the same time. 5.10 ammonium Weigh 1g sample was determined according to the provisions of GB/T 9732's. The yellow solution can not be deeper than the standard colorimetric solution. Preparation of the standard developing solution containing 0.03mg ratio is taken of ammonium (NH4) standard solution, the same treatment simultaneously with the sample. Sodium 5.11 Determined according to the provisions of GB/T 9723-2007 of. 5.11.1 Instrument Conditions Source. sodium hollow cathode lamp; Wavelength. 589.0nm; Flame. acetylene - air. 5.11.2 Determination Weigh 1g sample was dissolved in water and diluted to 100mL. Take 20mL, 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. 5.12 Iron Weigh 1g sample was dissolved in 15mL water, the solution pH is adjusted with hydrochloric acid solution (15%) 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 0.005mg of iron (Fe) standard solution, the same treatment simultaneously with the sample. 5.13 Heavy Metal 4g weighed sample was dissolved in 40mL water, and cooled. Take 30mL, 0.2mL added acetic acid (30%) and 10mL freshly prepared saturated Hydrogen sulfide and water, shake, place 10min. The solution was dark can not be deeper than the standard colorimetric solution. Standard Preparation of color solution ratio is to take the remaining 10mL sample solution and standard solution containing 0.01mg of lead (Pb), diluted to 30mL, simultaneously with the same volume of the same treated sample solution.

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, NBY-4, NB-5, NBY-5; Packaging forms. WB-1, WB-2, WB-3; Packing unit. Class 2, Class 3. ......

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