Formic acid for industrial use — Methods of test — Part 2: Determination of total acidity — Titrimet...
The principle consists in a titration of a test portion with a standard volumetric sodium hydroxide solution, using phenolphthalein as indicator. ISO/R 731 has been subdivised into seven parts. ISO 731/2 replaces clause 3 of ISO Recommendation R 731-1968.
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…
Chlorobenzene for industrial use — List of methods of test
Specifies the sampling, the determination of ditillation characteristics, the determination of density at 20 °C, the determination of residue on evaporation, the determination of water and the determination of acidity. The determination of distillation characteristics indicates the difference between the temperatures corresponding to the collection of two volumes of distillate, V0 and V1. These…
o-Dichlorobenzene 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, the determination of residue on evaporation, the determination of water and the determination of acidity. The determination of distillation characteristics indicates the difference between the temperatures corresponding to the collection of…
Methylene chloride for industrial use — List of methods of test
Specifies the sampling, the determination of residue on evaporation, the determination of distillation characteristics, the determination of density at 20 °C, the determination of acidity, the determination of water and the measurement of colour. The determination of distillation characteristics indicates either the temperatures corresponding to the collection of each of two volumes of distillate…
