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YS/T 575.17-2007Methods for chemical analysis of bauxite. Part 17: Determination of sulfur content. Direct combustion-iodometric method (English PDF)

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Issued by

National Development and Reform Commission

Level / Type

National · Recommended

Issue date

November 14, 2007

Implementation date

May 1, 2008

Scope

YS/T 575.17-2007 (Methods for chemical analysis of bauxite. Part 17: Determination of sulfur content. Direct combustion-iodometric method) is available as an English-translated PDF.

YS/T 575.17-2007 — This Part specifies the determination method of sulfur content in bauxite. This Part applies to the determination of sulfur content in bauxite. The determination range. <=3.00%.

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Document preview — YS/T 575.17-2007

National Standard of the People's Republic of China

ICS: 71.100.10
Classification: Q 52

Issued by: National Development and Reform Commission

1 Scope...5
2 Method Summary...5
3 Reagents...5
4 Instrumentation...6
5 Samples...8
6 Analysis Steps...8
7 Calculation of Analysis Results...9
8 Precision...9
9 Quality assurance and control...10

Foreword

YS/T 575-2007 "Methods for chemical analysis of bauxite", the revision to YS/T

575-2006 (formerly GB/T 3257-1999), is divided into 24 parts.

-- Part 1.Determination of aluminum oxide content - EDTA titration method

-- Part 2.Determination of silica dioxide content - Gravimetric-molybdenum blue

photometric method

-- Part 3.Determination of silica dioxide content - Molybdenum blue photometric

method

-- Part 4.Iron oxide content - Potassium dichromate titration method

-- Part 5.Determination of iron trioxide content - Orthopenanthroline photometric

method

-- Part 6.Determination of titanium dioxide content - Diantipyryl methane

photometric method

-- Part 7.Determination of calcium oxide content - Flame atomic absorption

spectrophotometric method

-- Part 8.Determination of magnesium oxide content - Flame atomic absorption

spectrophotometric method

-- Part 9.Determination of content of potassium oxide and sodium oxide - Flame

atomic absorption spectrophotometric method

-- Part 10.Determination of manganese oxide content - Flame atomic absorption

spectrophotometric method

-- Part 11.Determination of chromium oxide content - Flame atomic absorption

spectrophotometric method

-- Part 12.Determination of vanadium pentoxide content - benzoyl phenyl

hydroxylamine photometric method

-- Part 13.Determination of zinc content - Flame atomic absorption

spectrophotometric method

-- Part 14.Determination of total rare earth oxide content - Tribromoarsenazo

photometric method

-- Part 15.Determination of gallium oxide content - Rhodamine B-extraction

photometric method

Methods for chemical analysis of bauxite -

Part 17.Determination of sulfur content -

Direct combustion - iodometric method

1 Scope

This Part specifies the determination method of sulfur content in bauxite.

This Part applies to the determination of sulfur content in bauxite. The determination

range. <=3.00%.

2 Method Summary

In the presence of a flux, the sample is heated for decomposition in an oxygen stream at

1300°C±20°C; the sulfur dioxide generated is absorbed by water to form sulfurous acid;

use starch as the indicator; use iodine standard titration solution for titration, so as to

determine the sulfur content; the combined water in the sample influences the precision;

use rining method to eliminate.

3 Reagents

3.1 Lead sulfate. reference reagent.

3.2 Tin sheet (99.9%).

3.3 Sulfuric acid (rho 1.84 g/mL).

3.4 Mixed flux. mix vanadium pentoxide and boron oxide of equal-mas; grind it finely; then

dry it under 105°C~110°C before use.

3.5 Potassium hydroxide (400 g/L).

3.6 Solution of potassium permanganate (50 g/L). dissolve 10g of potassium

permanganate in 200 mL of potassium hydroxide (3.5).

3.7 Absorption solution. use a little water to mix 0.5g of soluble starch; stir it into a paste;

add 100 mL of boiling water; stir and heat it to dissolve until transparent; use water to

dilute to 1L; drop-add iodine standard titration solution (3.8) until sky blue; transfer it to a

volumetric flask or under jar (3 in Figure 1); use water to dilute to 1 L; shake up; store it in

an amber bottle; use it after storage overnight.

3.8 Titration solution

Table 1

Mass fraction of sulfur content / % Allowable difference /%

<=0.050 0.01

>0.050 ~ 0.100 0.02

>0.10 ~ 0.50 0.04

>0.50 ~ 1.00 0.08

>1.00 ~ 3.00 0.15

9 Quality assurance and control

Use standard samples or control samples for verification during the analysis, or use

standard samples or control samples for verification at least once a year. When the

process is out of control, the causes shall be identified. And the verification shall be

carried out once again after the mistakes are corrected.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.

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