Glass alcoholometers and alcohol hydrometers not incorporating a thermometer
Three different types of glass instruments for the accurate determination of the ethanol content of simple mixtures of ethanol and water are specified: alcoholometers graduated in percentage of ethanol by volume or by mass and alcohol hydrometers graduated in units of density. Construction, material and scale are described. The dimensions are tabled and the value of the ethanol content by mass or…
Sodium tripolyphosphate and sodium pyrophosphate for industrial use — Separation by column chromatog...
The determination of orthophosphate is not possible if the content is lower than 0.1 % (m/m). Tetrametaphosphates and pentametaphosphates are not usually present in commercial products. Specifies the absorption of the phosphate anions on an anionic ion-exchange resin. Elution with potassium chloride solutions of increasing concentrations. Calculation of the P2 O5 content in the different eluate…
The method is applicable to ferrosilicon having an aluminium content between 0,05 and 5 % (m/m). Specifies principle, reagents, apparatus, sample, procedure, expression of results and test report. Warns of perchloric acid fumes.
Condensed phosphates for industrial use (including foodstuffs) — Determination of oxides of nitrogen...
Applicable to products having contents, expressed in nitrogen, of 2 mg/kg or more. Oxidation of nitrogen(III) of a test portion to nitrogen(V) by potassium permanganate. Reaction of nitrogen(V) with 3,4-xylenol under specified conditions to form a nitrate derivative. Distillation of the nitrate derivative and absorption in a sodium hydroxide solution. Spectrophotometric measurement of the yellow…
Meat and meat products — Determination of glucono-delta-lactone content (Reference method)
The method consists in extracting of the compound with ice-cold perchloric acid solution, centrifuging, decanting and filtrating, followed by hydrolysis of the compound in a portion of the filtrate with potassium hydroxide into gluconate. Transformation of the gluconate in the extract by the following reactions: 1) with adenosine-5-triphosphate (ATP) and 2) with concomitant reduction of an…
Specification for pressboard and presspaper for electrical purposes. Part 2: Methods of test
Deals with test methods intended to check mechanical, electrical and chemical properties. Electric strength tests are under consideration.
The contents of the corrigendum of October 1994 have been included in this copy.
