Animal and vegetable fats and oils — Determination of gallates content — Molecular absorption spectr...
Other antioxidants which can be detected and identified by the method specified in ISO 5558, may interfere and give high results. The principle of the method is selective extraction of each gallats from a test portion by means of appropriate solvents and determination by ultraviolet spectrometric measurement, in the following order: - propyl gallate, - octyl gallate, - dodecyl gallate.
Animal feeding stuffs — Determination of calcium content — Part 2: Atomic absorption spectrometric m...
The limit of detection is in the region of 10 mg/kg. The principle of the method is, following any necessary destruction of organic matter by incineration of a test portion, dissolution of the calcium by treatment with hydrochloric acid and dilution of the solution obtained, in the presence of lanthanum. Then determination of the calcium content by atomic absorption spectrometry.
Fruits, vegetables and derived products — Determination of cadmium content — Flameless atomic absorp...
The method consists in decomposing the organic matter as described in ISO 5515, and determining the dissolved cadmium cation with a suitable spectrometer.
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of tes...
The method is applicable to products having high cresol contents. The principle consists in distillation of a test portion inder carefully defined conditions. Either determination of the temperatures corresponding to the condensate volumes defined or determination of the volume condensate when the thermometer indicates each of the distillaton temperatures (i.e. plotting temperature as a function…
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of tes...
Applicable to products having a high o-cresol content and a high m-cresol content. The principle consists in distillation of a tast portion under carefully defined conditions and determination of the mass of residue obtained. The distillation is carried out according to ISO 918. When all the water has distilled over, continue the distillation without intermediate measurements, until either the…
Fruit and vegetable products — Determination of benzoic acid content (benzoic acid contents greater ...
The method consists in extracting the acid from an acidified test portion using diethyl ether, nitrating followed by reduction and Mohler's reaction modified with hydroxylaminehydrochloride, measuring the absorbance of the red complex obtained with a suitable spectrometer. For determining lower concentrations, see ISO 5518.
Chromium ores and concentrates — Determination of chromium content — Titrimetric method
The method is applicable to products having a chromium content greater than 7 % (m/m). Should be read in conjunction with ISO 6629. Specifies principle, reagents, apparatus, procedure and expression of results.
Rectified oil of Eucalyptus globulus Labillardière, Portugal
The oil is classified as one of the following three types, according to the 1,8-cineole content: 70,0 to 74,9 % (m/m) of 1,8-cineole; 75,0 to 79,9 % (m/m) of 1,8-cineole; 80,0 to 85,0 % (m/m) of 1,8-cineole. For these three types descriptions and permissible values for the characteristics appearance, colour, odour, relative density at 20/20 °C, refractive index at 20 °C, optical rotation at 20 °C…
Acetic acid for industrial use — Methods of test — Part 3: Determination of formic acid content — Io...
Specifies the determination of total reducing matter and of reducing compounds other than formic acid. The principle consists in oxidation of formic acid and other reducing compounds in a test portion with an excess of sodium hypobromit solution. Determination of the excess sodium hypobromite by iodometry. Oxidation of reducing compounds other than formic acid with an excess of potassium bromide-…
