Surface active agents — Determination of alkalinity — Titrimetric method
A clear solution of the substance is titrated with a standard volumetric hydrochloric acid solution, in the presence of methyl orange or bromophenol blue as indicator. This method is only applicable when so indicated in the specific standard for each product; in particular, it is not suitable for products containing soaps.
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 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).
The Standard specifies the following characteristics of the oil. Appearance: Clear, mobile liquid. Colour: Reddish brown to dark brown. Odour: Characteristic, spicy, recalling that of cinnamaldehyde. Refractive index at 20 °C: 1,5300 - 1,5400. Optical rotation at 20 °C: Range from - 2,5 to + 2 . Solubility in 70 % (V/V) ethanol at 20 C: 1 volume in 2 volumes. The values for the relative density…
Liquid halogenated hydrocarbons for industrial use — Determination of acidity — Titrimetric method
The method does not apply when the halogenated materials hydrolyse at ambient temperature. The principle is based on the titration of the acidity of the aqueous extract from a test portion with a standard volumetric sodium hydroxide solution in the presence of bromocresol green as indicator. - Replaces ISO Recommendation R 1393-1970.
Phthalic anhydride for industrial use — Methods of test — Part 5: Determination of free acidity — Po...
The principle of the method consists in the potentiometric titration of a test portion not exceeding 10 g and containing not more than 0.150 g of phthalic acid, with a standard volumetric solution of triethylamine in anhydrous butanone. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.
Phthalic anhydride for industrial use — Methods of test — Part 6: Determination of phthalic anhydrid...
The principle consists in the dissolution of a test portion in an excess of standard volumetric sodium hydroxide solution and back-titration of the excess with a standard volumetric hydrochloric acid solution using phenolphthalein as indicator. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.
