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GB/T 657-2011 English PDF

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GB/T 657-2011: Chemical reagent -- Hexammonium heptamolybdate tetrahydrate
Status: Valid

GB/T 657: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 657-2011English169 Add to Cart 3 days [Need to translate] Chemical reagent -- Hexammonium heptamolybdate tetrahydrate Valid GB/T 657-2011
GB/T 657-1993English199 Add to Cart 2 days [Need to translate] Chemical reagent. Hexaammonium heptamolybdate terahydrate Obsolete GB/T 657-1993

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Basic data

Standard ID GB/T 657-2011 (GB/T657-2011)
Description (Translated English) Chemical reagent -- Hexammonium heptamolybdate tetrahydrate
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G62
Classification of International Standard 71.040.30
Word Count Estimation 7,765
Date of Issue 2011-05-12
Date of Implementation 2011-12-01
Older Standard (superseded by this standard) GB/T 657-1993
Quoted Standard GB/T 601; GB/T 602; GB/T 603; GB/T 6682; GB/T 9728; GB/T 9738; GB 15346; HG/T 3484; HG/T 3921
Adopted Standard ISO 6353-3-1987, NEQ
Regulation (derived from) Announcement of Newly Approved National Standards No. 6 of 2011
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 standard specifies the chemical reagent ammonium molybdate tetrahydrate traits, specifications, testing, inspection and marking and packaging rules. This standard applies to ammonium molybdate tetrahydrate chemical reagent test.

GB/T 657-2011: Chemical reagent -- Hexammonium heptamolybdate tetrahydrate

---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.
Chemical reagent. Hexaammonium heptamolybdate terahydrate ICS 71.040.30 G62 National Standards of People's Republic of China Replacing GB/T 657-1993 Chemical Reagents Ammonium molybdate tetrahydrate (ammonium molybdate) Chemicalreagent- (ISO 6353-3. 1987, Reagentsforchemicalanalysis- Part 3. Specifications-Secondseries, NEQ) Issued on. 2011-05-12 2011-12-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard and ISO 6353-3. 1987 "the third part of chemical analysis reagents. Specifications 2 Series" in R65 "molybdate tetrahydrate," the Non-equivalent. This standard replaces GB/T 657-1993 "Chemicals paramolybdate tetrahydrate (ammonium molybdate)", and GB/T 657-1993 compared to major Changes are as follows. --- Clarity test specifications by a "qualified" to "No. 4", "6" (1993 version 3.3, this version of Chapter 4); --- Chemical reagents common method of measuring water-insoluble substance use (the 1993 version 4.3.2, this version 5.6); --- Determination of heavy metals increased sodium sulfide - Glycerin colorimetry (1993 edition 4.3.6; edition 5.10); --- Modify the packaging and logo (the 1993 edition, Chapter 6, Section 7 of this edition). 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 was drafted. Sinopharm Chemical Reagent Co., Ltd. The main drafters of this standard. Chenhao Yun. This standard replaces the standards previously issued as follows. --- GB/T 657-1965, GB/T 657-1979, GB/T 657-1993. Chemical Reagents Ammonium molybdate tetrahydrate (ammonium molybdate) Molecular formula. (NH4) 6Mo7O24 · 4H2O Molecular Weight. 1235.87 (according to 2007 international relative atomic mass)

1 Scope

This standard specifies the chemical reagent ammonium molybdate tetrahydrate traits, specifications, testing, packaging and inspection rules and signs. This standard applies to chemical reagent ammonium molybdate tetrahydrate 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 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) GB/T 9728 General method for determination of chemical reagents sulfate (GB/T 9728-2007, ISO 6353-1. 1982, NEQ) GB/T 9738 Determination of water insoluble chemical reagent - 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 or slight blue-green crystals dissolve in water, soluble in ethanol.

4 Specification

Ammonium molybdate tetrahydrate as shown in Table 1. Table 1 Name AR chemically pure Content [(NH4) 6Mo7O24 · 4H2O], w /% ≥99.0 ≥99.0 Formulated solution of the test Pass Pass Clarity test/number ≤4 ≤6 Water-insoluble, w /% ≤0.01 ≤0.03 Chloride (Cl), w /% ≤0.001 ≤0.003 Sulfate (SO4), w /% ≤0.02 ≤0.05 Phosphate, arsenate, silicate (SiO3 to count), w /% ≤0.001 ≤0.003 Heavy Metals (as Pb), w /% ≤0.001 ≤0.003

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