Copper alloys — Determination of iron content — Na2EDTA titrimetric method
The method is applicable to contents of iron in all types of copper alloys listed in International Standards. ISO 4748 specifies principle, reagents, apparatus, procedure, expression of results and test report.
Rubber, raw, natural — Determination of castor oil content — Part 1: Determination of castor oil gly...
The addition of the mentioned ingredient is intended to facilitate crumbing. This part of standard aids the estimation of the amount of oil remaining in the rubber. Triglyceride of ricinoleic acid is the principal constituent of castor oil (80...85 %). Method applicable to all grades of natural rubber. Lower limit of detection approx. 0.05 % of castor oil glycerides. - Part 2 of this standard…
Copper and copper alloys — Determination of sulfur content — Combustion titrimetric method
The method is applicable to contents of sulfur greater than 0,010 % (m/m) in all types of copper and copper alloys listed in International Standards. Specifies principle, reagents, apparatus, procedure, expression of results and test report. Figure 1 demonstrates the apparatus for the determiantion of sulfur by combustion, figures 2 and 3 illustrate some details.
Ferrotungsten — Determination of tungsten content — Cinchonine gravimetric method
The method is applicable to ferrotungsten having tungsten contents between 70 and 90 % (m/m). Specifies principle, reagents, apparatus, sample, procedure, expression of results and test report. It also specifies, in the annex, a spectrometric method for the determination of molybdenum which interferes with the determination.
Manganese ores and concentrates — Determination of arsenic content — Spectrometric method
The method is applicable to products having an arsenic content of 0,001 to 0.2 % (m/m). Should be read in conjunction with ISO 4297. Specifies principle, reactions, reagents, apparatus, sample, procedure and expression of results. A figure illustrates the apparatus for the distillation of arsenic.
Copper alloys — Determination of lead content — Flame atomic absorption spectrometric method
The method is applicable to contents of lead as an alloying element or an impurity between 0.01 and 5.0 % (m/m). By appropriate modification of sample mass, the lower limit may be extended to 0.002 % (m/m). ISO 4749 specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Copper alloys — Determination of nickel content — Gravimetric method
The method is applicable to the determination of nickel contents between 2 and 50 % (m/m). ISO 4742 specifies principle, reagents, apparatus, procedure, expression of results and test report. Normal precautions regarding the use of perchloride acid in laboratory work should be observed.
Leather — Determination of nitrogen content and "hide substance" — Titrimetric method
The principle consists in decomposition of a test portion by Kjeldahl method, distillation of the ammonia liberated, determination of the nitrogen content by titration of the ammonia with sulfuric or hydrochloric acid, using phenolphthalein as indicator. The method is applicable to all types of leather in all types of tannage.
Leather — Determination of total silicon content — Reduced molybdosilicate spectrometric method
Principle: oxydation of a test portion in a Parr bomb under alkaline conditions to destroy organic matter and to solubilize the mineral matter. Formation of molybdosilicate complex and spectrometric measurement at a wavelength of 630 nm.
