Sodium hexafluorosilicate for industrial use — Determination of free acidity and total hexafluorosil...
With respect to the free acidity, applicable to products having contents, expressed as H2 SiF6 , equal to or more than 0,1 % (m/m). First, determination of the free acid contents by titration of an ice-cooled test portion with a standard volumetric sodium hydroxide solution in the presence of potassium nitrate and using bromothymol blue as indicator, then, followed by titration at near boiling…
Diffusable Hydrogen in Mild Steel and Low-Alloy Steel Weld Metals: Test
Method
1. Scope
1.1 The purpose of this Standard is to provide a test method for measuring
the content of diffusible hydrogen in deposited weld metal.
Note: In order to obtain the total hydrogen content, it would be
necessary to obtain the residual content by hot extraction at 650°C
under vacuum or using a carrier gas method.
1.2 This assessment shall…
Formic acid for industrial use — methods of test — Part 7: Determination of low contents of other vo...
The principle consists in a decomposition of most of the formic acid in a test portion by sulphuric acid an of the remainder by chromic acid. Steam distillation of acetic acid and/or other volatile acids and titration of the distillate with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The method is applicable to products containing less than 0,5…
Formic acid for industrial use — Methods of test — Part 3: Determination of content of other acids —...
The principle consists in a quantitative oxidation of the formic acid in a test portion with excess mercury(II) oxide. Potentiometric titration of the residual acids with standard volumetric sodium hydroxide solution. The method is applicable to products containing 0,5 to 6,0 % (m/m) of other acids, expressed as acetic acid. ISO/R 731 has been subdivised into seven parts. ISO 731/3 replaces…
Formic acid for industrial use — Methods of test — Part 4: Visual limit test for inorganic chlorides
Applicable to products having inorganic chlorides contents in the range 0,0005 to 0,5 % (m/m). Comparison of the turbidity, obtained by the addition of silver nitrate to a solution prepared from a test portion, with that similarly obtained from a standard chloride solution.
Formic acid for industrial use — Methods of test — Part 5: Visual limit test for inorganic sulphates
The principle consists in a comparison of the turbidity, obtained by the addition of barium chloride to a solution prepared from a test portion in the presence of hydrochloric acid, with that similarly obtained from a standard sulphate solution. The method is a applicable to products having inorganic sulphates contents, expressed as sulphate (SO42-), in the range 0,001 to 0,1 % (m/m).
o-Chlorotoluene for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, the determination of density at 20 °C, the determination of crystallizing point and the determination of p- and o-chlorotoluene content. The determination of distillation characteristics indicates the difference between the temperatures corresponding to the collection of two volumes of distillate, V0 and V1. These two…
p-Chlorotoluene for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, the determination of density at 20 °C, the determination of crystallizing point and the determination of o- and p-chlorotoluene content. The determination of distillation characteristics indicates the difference between the temperatures corresponding to the collection of two volumes of distillate, V0 and V1. These two…
Aluminium and aluminium alloys — Determination of copper — Atomic absorption spectrophotometric meth...
The method is applicable to copper contents between 0,005 and 5 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
