Fruit and vegetable products — Determination of formic acid content — Part 2: Routine method
The method consists in quantitative entraining by steam of the acid present in a test portion, determing of the amount of iodine equivalent to the amount of bromine consumed by the acid in the distillate, by titration with sodium thiosulfate standard volumetric solution.
Paints and varnishes — Determination of total lead — Flame atomic absorption spectrometric method
The method is principle to coating materials having lead contents in the range of about 0,01 % (m/m) to 2 % (m/m), may also be applicable to products with a total lead content of more than 2 % (m/m) when the requirements of precision does not exceed the specified values. two methods are given. The principle of the dry ashing method consists in evaporation of a test portion to dryness and ashing…
Fruits, vegetables and derived products — Determination of lead content — Flameless atomic absorptio...
The method consists in decomposing the organic matter in a nitric acid medium at high temperature and under pressure, and determining the lead(II) cation with a suitable spectrometer after the addition of orthophosphoric acid.
Cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and photometry
Describes a method suitable for hard, semi-hard and soft cheeses of various ages and for processed cheese. The principle is based on extraction of the cheese with warm water, precipitation of the fat and proteins, filtration and reduction of the nitrate in a portion of the filtrate to nitrite by means of copperized cadmium. The detection limits of the method are 5 mg of nitrate per kilogram and 0…
Guidelines for the presentation of International Standards dealing with the design of structures
The different approaches to the drafting of International Standards resulted in a lack of uniformity in the technical content, and in the layout and sequence of the subject matter, of such documents. This Technical Report has, therefore, been prepared to create guidelines for the presentation of International Standards dealing with the design of structures.
Check of the calibration of moisture meters — Part 1: Moisture meters for cereals
The method is applicable to oats, durum wheat, wheat, maize, barley, rice, rye and sorghum. It consists in preparing of several test samples, or a range of test samples, with different moisture contents, under specified conditions, determining of their moisture contents by a reference method and measuring with the meter to be checked. An annex specifies the maximum permitted errors.
Copper and copper alloys — Determination of tin content — Spectrometric method
The method is applicable to the determination of tin contents between 0.005 and 0.5 % (m/m) in all types of copper and copper alloys listed in International Standards. A method applicable to the determination of tin contents below 0.005 % (m/m) is in preparation. ISO 4751 specifies principle, reagents, apparatus, procedure, preparation of calibration graph, expression of results and test report.
