Chromium ores — Determination of calcium and magnesium contents — EDTA titrimetric method
The method is applicable to products having a calcium content greater than 0,1 % (m/m) and a magnesium content greater than 3,0 % (m/m). Should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, procedure and expression of results.
This PDF includes GI #2 and Errata.
1. Scope and Introduction
1.1 This Standard is intended to cover the field of technical drawing practice. It applies primarily to end-product drawings, which usually consist of detail drawings, and assembly or subassembly drawings, but is not intended to fully cover other supplementary drawings such as check lists, schematic diagrams, electrical wiring…
Minimum Nutritional Testing, Labelling and Manufacturing Procedures for Pet
Foods
Applies to the nutrient content and adequacy of pet food for dogs
and cats, including relevant test procedures to maintain quality
control. The standard permits two methods of evaluation: complete
feeding studies and limited feeding studies with chemical
analysis.
Coffee — Determination of caffeine content (Reference method)
The method consists in extracting of the caffeine from a test portion, in an ammoniacal medium, successive purifying, with diethyl ether, on two chromatographic columns, the first in an alkaline medium, the second in an acid medium, followed by elution by chloroform. Spectrometric measurement of the eluate at the wavelength of maximum absorbance (in the ultraviolet region). A first figure shows…
Phosphoric acid for industrial use (including foodstuffs) — Determination of vanadium content — Phos...
A yellow complex is formed by reaction of the vanadium present in a test portion with phosphoric acid and sodium tungstate in acid medium. The spectrometric measurement of the absorbance is carried out at a wavelength of about 425 nm. The method is applicable to products having a vanadium content equal to or greater than 3 mg/kg.
Hexafluorosilicic acid for industrial use — Determination of available fluorine content — Potentiome...
Covers a method consisting in separating the fluorine from a test portion by distillation in the presence of perchloric acid, followed by potentiometric titration of the distillate with lanthanum nitrate solution using a fluoride ion-selective electrode. Is applicable to products having total available fluorine contents in the range between 15 and 35 % (m/m).
Timber structures — Joints made with mechanical fasteners — General principles for the determination...
Applies to joints made with mechanical fasteners used in statically loaded timber structures. Covers the conditioning of test specimens and explains the apparatus to be used for measuring the geometry of the test specimens, their moisture content and other characteristics. Details the loading procedure and specifies the details to be included in the test report.
