GB/T 11200.1-2006_English: PDF (GB/T11200.1-2006)
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| GB/T 11200.1-2006 | English | 135 |
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Sodium hydroxide for industrial use -- Determination of sodium chlorate content -- O-Tolidine spectrometric method
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GB/T 11200.1-2006
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| GB/T 11200.1-1989 | English | 199 |
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Membrane process sodium hydroxide--Determination of sodium chlorate content--Tolidine spectrometric method
| Obsolete |
GB/T 11200.1-1989
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| Standard ID | GB/T 11200.1-2006 (GB/T11200.1-2006) | | Description (Translated English) | Sodium hydroxide for industrial use. Determination of sodium chlorate content. O-Tolidine spectrometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G11 | | Classification of International Standard | 71.060.40 | | Word Count Estimation | 6,693 | | Date of Issue | 2006-09-14 | | Date of Implementation | 2007-02-01 | | Older Standard (superseded by this standard) | GB/T 11200.1-1989 | | Quoted Standard | GB/T 602; GB/T 603 | | Drafting Organization | Jinxi Chemical Research Institute | | Administrative Organization | National Standardization Technical Committee of the chlor-alkali chemical branch | | Regulation (derived from) | National Standard Approval Announcement 2006 No.11 (Total No.98) | | Proposing organization | China Petroleum and Chemical Industry Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the method of sodium chlorate for industrial use in the determination of sodium hydroxide. This standard applies to industrial mass fraction of sodium chlorate in 0. 00005% to 0. 01 % of the product. | | Standard ID | GB/T 11200.1-1989 (GB/T11200.1-1989) | | Description (Translated English) | Membrane process sodium hydroxide--Determination of sodium chlorate content--Tolidine spectrometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G11 | | Classification of International Standard | 71.060.40 | | Word Count Estimation | 2,263 | | Date of Issue | 1989/3/31 | | Date of Implementation | 1990/1/1 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 11, 2006 (No. 98 overall) |
GB/T 11200.1-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.40
G 11
Replacing GB/T 11200.1-1989
Sodium Hydroxide for Industrial Use - Determination of
Sodium Chlorate Content - o-Tolidine Spectrometric
Method
ISSUED ON: SEPTEMBER 14, 2006
IMPLEMENTED ON: FEBRUARY 1, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Method Summary ... 4
4 Reagents ... 4
5 Instruments ... 5
6 Analytical Procedures ... 6
7 Result Calculation ... 7
8 Tolerances ... 7
9 Test Report ... 7
Sodium Hydroxide for Industrial Use - Determination of
Sodium Chlorate Content - o-Tolidine Spectrometric
Method
1 Scope
This Standard specifies the method of determining sodium chlorate content in sodium
hydroxide for industrial use.
This Standard is applicable to products with a mass fraction of sodium chlorate 0.00005% ~
0.01% in sodium hydroxide for industrial use.
2 Normative References
The clauses of the following documents become clauses of this Standard through the normative
references in this Standard. In terms of references with a specified date, all subsequent
amendments (excluding errata content) or revisions do not apply to this Standard. However, the
various parties that reach an agreement in accordance with this Standard are encouraged to
explore whether the latest versions of these documents are applicable. In terms of references
without a date, the latest versions apply to this Standard.
GB/T 602 Chemical Reagent - Preparations of Standard Solutions for Impurity (GB/T 602-
2002, ISO 6353-1:1982, NEQ)
GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test Methods
(GB/T 603-2002, ISO 6353-1:1982, NEQ)
3 Method Summary
In a strong acid medium, sodium chlorate decomposes into chlorine gas and chlorine dioxide;
under the condition of pH < 1.3, chlorine gas and chlorine dioxide react with o-tolidine to
generate a stable yellow complex; use a spectrophotometer to determine the absorbance.
4 Reagents
Unless it is otherwise stated, only reagents confirmed to be analytically pure and deionized
water or water of equivalent purity are used in the analysis.
The container used for sodium chlorate analysis in this method shall avoid contact with rubber
or other organic matters.
4.1 Hydrochloric acid: high-grade purity.
4.2 Sodium hydroxide solution: 400 g/L.
4.3 Sodium chlorate standard solution: 1 g/L.
Weigh-take 1.000 g of sodium chlorate, transfer it into a 1,000 mL volumetric flask, then dilute
to the scale.
4.4 Sodium chlorate standard solution: 10 mg/L.
Measure-take 5.00 mL of sodium chlorate standard solution (4.3), place it in a 500 mL
volumetric flask, then dilute to the scale. This solution shall be prepared before use.
4.5 O-tolidine indicating solution: 1 g/L.
Weigh-take 0.5 g of o-tolidine, place it in a mortar; add a small amount of mixed solution of 50
mL of hydrochloride acid (4.1) and 200 mL of water for grinding, then, transfer it together with
the remaining mixed solution into a 500 mL beaker. Add 150 mL of water, heat it while stirring.
After dissolving, transfer all the solution into a 500 mL brown volumetric flask, and use water
to dilute to the scale.
This solution shall be stored in a brown bottle in the dark. It shall remain valid for 3 months.
5 Instruments
General laboratory instruments and the following instruments.
5.1 Separating funnel.
5.2 Two-mouth flask: 500 mL.
5.3 Water bath: controllable at (50 2) C.
5.4 Spectrophotometer.
a---two-mouth flask;
b, c---separating funnel.
Figure 1 -- Schematic Diagram of Determination Device of Sodium Chlorate
6 Analytical Procedures
6.1 Drawing of Standard Curve
6.1.1 Respectively add 0 mL, 0.5 mL, 1.0 mL, 1.5 mL, 2.0 mL and 2.5 mL of sodium chlorate
standard solution (4.4) into the two-mouth flask. Respectively add 3.0 mL, 2.5 mL, 2.0 mL, 1.5
mL, 1.0 mL and 0.5 mL of water, then add 3.0 mL of sodium hydroxide solution (4.2).
6.1.2 Immerse the two-mouth flask in water bath at about 50 C for about 0.5 min, then, take it
out. Quickly connect the separating funnel filled with 8.0 mL of hydrochloric acid (4.1) and 1.0
mL of o-tolidine indicating solution (4.5) to the two-mouth flask, tighten it to avoid air leakage.
Place the two-mouth flask in tap water for rapid cooling, then, take it out. Firstly, add
hydrochloric acid (4.1) into the two-mouth flask, mix it well, then, add o-tolidine indicating
solution (4.5) into the two-mouth flask and shake it for 1 min; add 35 mL of water from the
separating funnel. Transfer all the solution into a 100 mL volumetric flask; use water to dilute
to the scale and shake it well.
6.1.3 Use water to adjust the zero point of the spectrophotometer; select a suitable cuvette. At
a wavelength of 442 nm, determine the absorbance.
6.1.4 In accordance with 6.1.2 and 6.1.3, respectively determine other curve points.
6.1.5 Subtract the absorbance of the reagent blank from the absorbance of the colorimetric
solution. Take the mass of sodium chlorate (g) contained in 100 mL of colorimetric solution
as the x-coordinate, and the corresponding absorbance as the y-coordinate to draw a standard
curve.
6.2 Sample Solution
Weigh-take an appropriate amount of laboratory sample (accurate to 0.01 g) and prepare a
certain volume of sample solution (no more than 33% based on NaOH), so that the amount of
sodium chlorate does not exceed 12 mg/L.
6.3 Blank Test
Without adding test portion, add 3.0 mL of sodium hydroxide solution (4.2) and 3.0 mL of water.
Adopt the same analytical procedures, reagents and dosages as the determination of the test
portion to conduct the blank test.
6.4 Determination
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