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GB/T 9742-2008 English PDF

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GB/T 9742-2008: Chemical reagent -- General method for the determination of silicate
Status: Valid

GB/T 9742: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 9742-2008English149 Add to Cart 2 days [Need to translate] Chemical reagent -- General method for the determination of silicate Valid GB/T 9742-2008
GB/T 9742-1988English199 Add to Cart 2 days [Need to translate] Chemical reagent--General method for the determination of silicate Obsolete GB/T 9742-1988

PDF similar to GB/T 9742-2008


Standard similar to GB/T 9742-2008

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Basic data

Standard ID GB/T 9742-2008 (GB/T9742-2008)
Description (Translated English) Chemical reagent -- General method for the determination of silicate
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G60
Classification of International Standard 71.040.30
Word Count Estimation 5,557
Date of Issue 2008-05-15
Date of Implementation 2008-11-01
Older Standard (superseded by this standard) GB/T 9742-1988
Quoted Standard GB/T 602; GB/T 603; GB/T 6682; GB/T 9721
Adopted Standard ISO 6353-1-1982, NEQ
Regulation (derived from) National Standard Approval Announcement 2008 No.8 (Total No.121)
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 general method using molybdenum blue colorimetric determination of silicate. This standard applies to the determination of trace chemicals or fluorine silicate silicate. Spectrophotometric or visual colorimetric detection range 0. 2��g/mL ~ 3��g/mL (in SiO3 dollars).

GB/T 9742-2008: Chemical reagent -- General method for the determination of silicate

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Chemical reagent. General method for the determination of silicate ICS 71.040.30 G60 National Standards of People's Republic of China Replacing GB/T 9742-1988 Chemical Reagents General method for the determination of silicate (ISO 6353-1. 1982, Reagentsforchemicalanalysis- Part 1. Generaltestmethods, NEQ) Posted 2008-05-15 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard and ISO 6353-1. 1982 "Chemical analysis of reagent --- Part 1. General test method" non-equivalent. This standard replaces GB/T 9742-1988 "General method for determination of chemical reagents silicate", compared with the GB/T 9742-1988 Main Changes are as follows. --- Improve the spectrophotometric measurement (1988 edition, Chapter 6; edition 6.2). --- Canceled Appendix A (1988 edition of Appendix A). 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, Chen Hong. This standard was first published in 1988. Chemical Reagents General method for the determination of silicate

1 Scope

This standard specifies the general method of silicon molybdenum blue colorimetry silicate. This standard applies to the determination of trace chemical reagents silicate or fluorosilicate. Spectrophotometric or visual colorimetric detection range 0.2μg/mL ~ 3μg/mL (in SiO3 dollars).

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. 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 9721 Chemicals General molecular absorption spectrophotometry (UV and visible part)

3 PRINCIPLE OF THE METHOD

Ba concentration in sulfuric acid (12H2SO4 ) Is not greater than 0.4mol/L sulfuric acid solution, silicic acid and ammonium molybdate quantitatively, generating silicomolybdenum Miscellaneous Acid (silicon molybdenum yellow). In the presence of oxalic acid, hydrochloric acid solution was added stannous chloride, silicon molybdenum yellow reduced to molybdenum blue silicon, silicon-molybdenum based on deep blue colors Shallow, usable visual colorimetry or spectrophotometry silicate. Oxalic acid can eliminate phosphates, arsenate and an excess of ammonium molybdate assay interference.

4 Reagents and materials

Unless otherwise specified in this standard, the standard solution used in formulations and products, according to GB/T 602, the provisions of the preparation of GB/T 603; and experiments Water should be consistent with GB/T 6682 water in three specifications, are the mass fraction of the solution used in "%" represents.

5 Instruments

5.1 General laboratory equipment. 5.2 Spectrophotometer shall comply with GB/T 9721's.

6 Determination

6.1 visual colorimetry Sampling according to product standards and the preparation of test solution (if necessary, add 2 drops of saturated 2,4-dinitrophenol indicator solution, adjusting the pH value of the solution). Of 10mL test solution, add 4.5mL sulfuric acid solution (5%), then the solution acidity Ba (H +) is about 0.3mol/L. Add 2mL molybdate solution Solution (100g/L), placed 20min. Add 5mL oxalic acid solution (50g/L), placed 5min. Stannous chloride hydrochloride was added 0.2mL (20g/L), diluted to 25mL, shake for 5min. The solution was blue comparison with the standard colorimetric solution. Preparation of the standard color solution containing a predetermined amount than is taken silicate (Si03) standard solution was diluted to 10mL, and at the same time with the same volume of test solution

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