Dried milk — Determination of lactic acid and lactates content — Enzymatic method
Applies to all types of dried milk. The sampling shall be made according to ISO 707. The method specified is mainly based on `Methods of enzymatic food analysis: UV-method for the determination of L-lactic acid and D-lactic acid in foodstuffs' by Boehringer Mannheim GmbH.
Steel and cast iron — Determination of vanadium content — Potentiometric titration method
This method is applicable to vanadium contents between 0.04 % (m/m) and 2 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international co-operative tests. Annex B includes the graphical representation of precision data.
Manganese ores — Determination of active oxygen content, expressed as manganese dioxide — Titrimetri...
This third edition cancels and replaces the second edition (ISO 312-1980), of which it constitutes a minor revision. Specifies principle, reagents, apparatus, sample, procedure and expression of results. A figure gives an example of apparatus.
Commercially dry virgin cork, ramassage, gleanings, corkwood refuse and corkwaste — Definitions and ...
Applies to material defined in ISO 633 the moisture content of which is not higher than 14 % as determined in accordance with ISO 2386. Gross mass of bales is the size of commercially dry cork including packaging. The type of cork and the name of the exporting country shall be indicated on the bales.
Water quality — Determination of calcium and magnesium — Atomic absorption spectrometric method
The procedure is intended for the analysis of raw and drinking waters and can be used for waters having a calcium content of up to 50 mg/l and a magnesium content of up to 5 mg/l. For samples containing higher concentrations of calcium or magnesium a smaller volume of the sample must be taken for the analysis.
High nitrogen content, straight ammonium nitrate fertilizers — Determination or oil retention
The result of the method is a measure for the porosity of the material. The method is applicable to substances which do not contain materials soluble in gas oil and which are prilled or granular. It consists in total immersing of a test portion in gas oil for a specified period, followed by the draining away and the removal of surplus gas oil under specified conditions, and measuring of the…
Fruits, vegetables and derived products — Determination of zinc content — Part 1: Polarographic meth...
The method consists in ashing of a test portion in a muffle furnace at 525+25 C, treating the ash obtained with hydrochloric acid, neutralizing with ammonia solution and determing of the value using an ammonia/ammonium chloride electrolyte. Copper, tin, lead and cadmium do not interfere.
Aluminium ores — Determination of phosphorus content — Molybdenum blue spectrophotometric method
The method is applicable to materials having phosphorus contents, expressed as diphosphorus pentoxide between 0,01 and 5 % (m/m). The arsenic content of the sample does not affect the determination. Specifies principle, reagents, apparatus, sampling and samples, procedure, expression of results and test report. An annex shows the flowsheet of the procedure for the acceptance of test results.
