GB 1257-2007 English PDFUS$159.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 1257-2007: Working chemicals -- Potassium hydrogen phthalate Status: Valid GB 1257: Historical versions
Basic dataStandard ID: GB 1257-2007 (GB1257-2007)Description (Translated English): Working chemicals -- Potassium hydrogen phthalate Sector / Industry: National Standard Classification of Chinese Standard: G61 Classification of International Standard: 71.040.30 Word Count Estimation: 6,679 Date of Issue: 2007-10-25 Date of Implementation: 2008-04-01 Older Standard (superseded by this standard): GB 1257-1989 Quoted Standard: GB/T 602; GB/T 603; GB/T 6682; GB/T 9723-2007; GB/T 9724; GB/T 9729 Regulation (derived from): China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 relates to working standard reagents potassium hydrogen phthalate traits, specifications, testing, inspection and marking and packaging rules. Titration analysis for Working chemical potassium hydrogen phthalate test. GB 1257-2007: Working chemicals -- 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.Working chemicals.Potassium hydrogen phthalate ICS 71.040.30 G61 National Standards of People's Republic of China Replacing GB 1257-1989 Working Standard reagent potassium hydrogen phthalate 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 ForewordThe standard Chapter 4, 5.3.1,5.3.2 mandatory, other provisions are recommended. This standard replaces GB 1257-1989 "work reference reagent (capacity) of potassium hydrogen phthalate," compared with GB 1257-1989 master To change the following. --- Standard name was changed to "work reference reagent potassium hydrogen phthalate"; --- Modify the Content Measurement (before version 4.1, this version 5.3); --- Water-insoluble, chloride and iron three common methods use chemical agents measured (before version 4.3.2,4.3.3,4.3.6, Excerpts 5.6,5.7,5.10). 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. 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 potassium hydrogen phthalate Molecular formula. KHC8H4O4 Molecular weight. 204.22 (according to 2003 international relative atomic mass)1 ScopeThis standard specifies the operating reference reagent --- potassium hydrogen phthalate traits, specifications, testing, packaging and inspection rules and signs. This standard applies to the reference reagent titration analysis work --- potassium hydrogen phthalate test.2 Normative referencesThe 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 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 9729 General method for determination of chloride Chemicals (GB/T 9729-2007, ISO 6353-1. 1982, NEQ) 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 rules3 CharactersThis reagent is a colorless or white crystalline powder, soluble in water.4 SpecificationPotassium hydrogen phthalate as shown in Table 1. Table 1 specifications of potassium hydrogen phthalate Name reference work Content (KHC8H4O4), /% 99.95 ~ 100.05 pH value (50g/L, 25 ℃) 3.8 ~ 4.1 Clarity test, number ≤2 Water-insoluble, /% ≤0.003 Table 1 (continued) Name reference work Chloride (Cl), /% ≤0.002 Sulfur compounds (of SO4), /% ≤0.006 Sodium (Na), /% ≤0.005 Iron (Fe), /% ≤0.0005 Heavy metals (Pb), /% ≤0.00055 Test5.1 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 sodium hydroxide standard titration solution titration standard potassium hydrogen phthalate substances Weigh 0.5g at 105 ℃ ~ 110 ℃ standard potassium hydrogen phthalate material dried to a constant and precise to 0.00001g. Anti-place Shall flask, add 50mL no carbon dioxide dissolved in water, with type 231 glass electrode as indicator electrode with a 232-type saturated calomel electrode as the reference Electrodes with sodium hydroxide standard titration solution [Ba (NaOH) = 0.1mol/L] titrated to the end point. Weighing sodium hydroxide standard 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. Potassium hydrogen phthalate mass fraction, the value in the "%" means, according to equation (1). (1) Where. b --- Standards potassium hydrogen phthalate content (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 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 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. 5.8 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. 5.9 Sodium Determined according to the provisions of GB/T 9723-2007 of. 5.9.1 Instrument Conditions Source. sodium hollow cathode lamp; Wavelength. 589.0nm; Flame. acetylene - air. 5.9.2 Determination Weigh 4g sample was dissolved in water and diluted to 100mL. Take 10mL, a total of four parts, according to the provisions of GB/T 9723-2007 in 7.2.2 Measurement results calculated according to the provisions of 7.2.3. 5.10 Iron Weigh 1g sample was dissolved in 15mL of hot water, with hydrochloric acid solution (15%) the pH of the solution was adjusted to 2, according to GB/T 9739 of Determination provisions. 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. 5.11 Heavy Metal 4g weighed sample was dissolved in 40mL hot water, take 30mL, add 0.2mL acetic acid solution (30%) and 10mL freshly prepared saturated Hydrogen sulfide 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 rulesAccording to the provisions of HG/T 3921 is sampled and acceptance.7 Packaging and markingAccording 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. 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