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HG/T 3485-2003 English PDF
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HG/T 3485: Evolution and historical versions
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| HG/T 3485-2003 | English | 150 |
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Chemical reagent Vanadium pentoxide
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| HG/T 3485-1979 | English | 199 |
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(Pentoxide)
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HG/T 3485-2003: Chemical reagent Vanadium pentoxide
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT3485-2003
HG
CHEMICAL INDUSTRY STANDARD
ICS 71.040.30
G 62
Record No.. 13252-2004
Replacing HG/T 3485-1979
Chemical Reagent - Vanadium Pentoxide
Issued on: JANUARY 9, 2004
Implemented on: MAY 1, 2004
Issued by. National Development and Reform Commission of the People’s
Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Properties... 5
4 Specifications... 5
5 Test Methods... 5
6 Inspection Rules... 9
7 Packaging and Marking... 9
Foreword
This Standard gives three levels of guaranteed reagent, analytical reagent, and chemical pure.
This Standard replaced HG/T 3485-1979.
Compared with HG/T 3485-1979, the major changes of this Standard are as follows.
--- Adjust the sample weight for content determination from "0.25g" to "0.3g".
--- Change the sulfate determination method from the ethanol method to the general method.
--- Change the project name from "ammonium salt" to "ammonium".
--- Cancel the chemical analysis method for iron determination; and retain the flame atomic
absorption spectrometry method.
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of Chemical Reagent Sub-Committee of National
Technical Committee on Chemistry of Standardization Administration of China.
Drafting organizations of this Standard. Beijing Institute of Chemical Reagents Co., Ltd.; and
Shenyang Chemical Reagent Factory.
Chief drafting staffs of this Standard. Hao Yulin, Wang Sufang, Yang Yuhua, Ju Tianbao, and
Huang Yujuan.
This Standard was first-time published in 1979.
Chemical Reagent - Vanadium Pentoxide
Molecular formula. V₂O₅
Relative molecular mass. 181.88 (based on the 1997 international relative atomic mass)
1 Scope
This Standard specifies the specifications, test methods, inspection rules, packaging, and
marking of the chemical reagent vanadium pentoxide.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced document
applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
GB/T 603 Chemical reagents - Preparation of preparations and articles used in test methods
GB/T 619 Chemical reagent - Regulations for sampling and acceptance
GB/T 6682 Water for analytical laboratory use - Specification and test methods (neq ISO
3696.1987)
GB/T 9723-1988 Chemical reagent - General rules for flame atomic absorption
spectrometry
GB/T 9728 Chemical reagent - General method for the determination of sulphate (eqv ISO
6353-1.1982)
GB 15346 Chemical reagent - Packaging and marking
3 Properties
This reagent is a yellowish-brown or brick-red powder; slightly soluble in water, readily soluble
in alkalis, and soluble in hot concentrated acid.
4 Specifications
The chemical reagent vanadium pentoxide shall conform to the specifications in Table 1.
5 Test Methods
Unless otherwise specified, all standard titration solutions, standard solutions, preparations and
products used in this Clause shall be prepared in accordance with the provisions of GB/T 601,
GB/T 602 and GB/T 603.The water used in the experiment shall comply with the specification
of Class III water in GB/T 6682.The sample weighing shall be accurate to 0.01 g.
5.1 Content
Weigh 0.3 g of sample (accurate to 0.0001 g). Add 50 mL of water; slowly add 10 mL of sulfuric
acid; heat to dissolve; cool; add 4 drops of 1 g/L phenyl anthranilic acid-ethanol solution; and
titrate with ferrous ammonium sulfate standard titration solution [c(NH)4Fe(SO4)2=0.1 mol/L]
until the solution turns from purple-red to bright green.
The mass fraction W1 of vanadium pentoxide, expressed in "%", is calculated according to
Formula (1).
Where.
V - accurate value of the volume of the ammonium ferrous sulfate standard titration solution,
in mL;
c - accurate value of the concentration of the ammonium ferrous sulfate standard titration
solution, in mol/L;
M - molar mass of vanadium pentoxide, in g/mol [M(1/2V2O5) = 90.94];
m - accurate value of the sample mass, in g.
5.2 Hydrochloric acid insoluble matter and silicates
Weigh 3 g of sample; add 20 mL of hydrochloric acid and 1 g of hydroxylamine hydrochloride;
heat to dissolve; and evaporate to dryness in a water bath. Cool; add 10 mL of hydrochloric
acid, 1 g of hydroxylamine hydrochloride and 100 mL of water; heat to boiling; filter with
ashless filter paper; and wash the residue with 10% hot hydrochloric acid solution until the
washings are colorless. The filter residue was placed in a crucible that had been ignited to
constant weight in a high-temperature furnace at 800℃±50℃; and slowly heated to carbonize.
It was then ignited to constant weight in a high-temperature furnace at 800℃±50℃. The residue
mass shall not exceed.
Guarantee reagent... 3mg;
Analytical reagent... 6mg;
Chemical pure... 9mg.
5.3 Loss on ignition
Weigh 2 g of sample (accurate to 0.0001 g). Place it in a crucible that had been ignited to
constant weight in a high-temperature furnace at 400℃±50℃; and ignite to constant weight in
a high-temperature furnace at 400℃±50℃.
The mass fraction of loss on ignition, W2, expressed in "%", is calculated according to Formula
(2).
Where.
m2 - the accurate value of the mass of the residue and crucible after constant weighing, in g;
m1 - the accurate value of the mass of the crucible after constant weighing, in g;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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