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Council Directive of 26 February 1973 on the approximation of the laws of the Member States relating to the quantitative analysis of ternary fibre mixtures (73/44/EEC) (repealed)
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VARIANT 4
Consider the case of a fibre mixture which when qualitatively analysed gave the following components: carded wool, viscose, unbleached cotton.
Suppose that using variant 4, that is successively removing two components from the mixture of one single specimen, the following results are obtained:
Treatment with alkaline sodium hypochlorite does not entail any loss of mass in viscose, while unbleached cotton loses 3 %, therefore d1 = 1·0 and d2 = 1·03.
As a result of treatment with zinc chloride/formic acid, the mass of cotton increases by 4 %, so that d3 = (1·03 × 0·96) = 0·9888 rounded to 0·99, (d3 being the correction factor for the respective loss or increase in mass of the third component in the first and second reagents).
If the values obtained by chemical analysis and the correction factors are substituted in the formulae given in point I.8.1.4 of Annex I the following result is obtained:
P1% (wool) = 100 — (48·75 + 41·02) = 10·23 %
As has already been indicated for variant 1, these percentages must be corrected by the formulae indicated in point I.8.2 of Annex I.
P3A% (cotton) = 100 — (1057 + 4865) = 4078 %
The composition of the mixture is therefore:
| Viscose | 48·6 % |
| Cotton | 40·8 % |
| Wool | 10·6 % |
| 100·0% |
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