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PDF YS/T 575.17-2007 English (YS/T 575.17-2006: Older version)


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YS/T 575.17-2007English90 Add to Cart 0-9 seconds. Auto-delivery. Methods for chemical analysis of bauxite. Part 17: Determination of sulfur content. Direct combustion-iodometric method  
YS/T 575.17-2006English279 Add to Cart 3 days Methods for chemical analysis of bauxite. Determination of sulfur content. Direct combustion-iodometric method Obsolete

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YS/T 575.17-2007: PDF in English (YST 575.17-2007)

YS/T 575.17-2007 GB NONFERROUS METAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.10 Q 52 Replacing YS/T 575.17-2006 Methods for chemical analysis of bauxite - Part 17. Determination of sulfur content - Direct combustion - iodometric method ISSUED ON. NOVEMBER 14, 2007 IMPLEMENTED ON. MAY 01, 2008 Issued by. National Development and Reform Commission Table of Contents 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 (ρ 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. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.