BS ISO 22016:2015 pdf download

BS ISO 22016:2015 pdf download.Determination of sulfur in refractory products and raw materials by gravimetric, photometric and titrimetric methods
1 Scope
This International Standard specifies methods for the wet chemical analysis of refractory products and their raw materials with below 5 % (mass percentage) sulfur.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 836, Terminology for refractories
ISO 6353-1, Reagents for chemical analysis — Part 1: General test methods
ISO 6353-2, Reagents for chemical analysis — Part 2: Specifications — First series
ISO 6353-3, Reagents for chemical analysis — Part 3: Specifications — Second series
ISO 8656-1, Refractory products — Sampling of raw materials and unshaped products — Part 1: Sampling scheme
ISO 26845, Chemical analysis of refractories — General requirements for wet chemical analysis, atomic absorption spectrometry (AAS) and inductively coupled plasma atomic emission spectrometry (ICP-AES) methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 836, ISO 26845, and the following apply.
3.1 sulfur
general term for elemental sulfur, sulfides, sulfates, sulfites, etc. in refractory products and their raw materials
4 Apparatus
4.1 General
The following apparatus is required in addition to ordinary laboratory apparatus and the apparatus given in ISO 26845.
4.1.1 Platinum crucible, with a nominal volume of 25 ml, made, for example, in Pt/Au 95/5 %.
4.1.2 pH-meter.
4.1.3 Electrically heated furnace, adjustable to (1 150 ± 25) °C.
5 Reagents
5.1 General
Prepare the following reagents and those given in ISO 26845, as necessary.
Use only reagents of recognized analytical grade during the analysis unless otherwise stated and only distilled water or water of equivalent purity.
Reagents should conform to the requirements of ISO 6353-1, ISO 6353-2, and ISO 6353-3, as appropriate.
5.1.1 Silver nitrate solution (10 g/l), dissolve 1 g of silver nitrate into 100 ml of water. Store the solution in an amber-coloured bottle.
5.1.2 Sodium carbonate solution (5 g/l), dissolve 5 g of anhydrous sodium carbonate into 1 l of water.
5.1.3 Sodium thiosulfate pentahydrate for Method B, Na 2 S 2 O 3 ·5H 2 O, (ISO 6353-2, R 36), minimum mass fraction 99,0 %.
5.1.4 Potassium nitrate.
5.1.5 Barium chloride di-hydrate for Method A2, BaCl 2 ·2H 2 O.
5.1.6 Barium chloride solution.
5.1.6.1 100 g/l anhydrous BaCl 2 for Method A1, 10 g of anhydrous barium chloride is dissolved in water and made up 100 ml.
5.1.6.2 100 g/l BaCl 2 ·2H 2 O for Method A2, 10,0 g Barium chloride di-hydrate (5.1.5) is dissolved in water and made up to 100 ml.
5.1.6.3 5,42 g/l anhydrous BaCl 2 for Method C, 0,542 g of anhydrous barium chloride is dissolved in water and made up to 100 ml.
5.1.7 Tin(II): strong phosphoric acid solution for Method B, transfer 500 g of phosphoric acid into the quartz flask in Figure 1 in Clause 5, heat it to 250 °C for 1 h to dehydrate, draw with water aspirator to remove steam generated, and cool. Add 80 g of anhydrous tin(II) chloride, heat the mixture under nitrogen gas to 300 °C, cool to room temperature under nitrogen gas, and store in a desiccator.