ICS 71.100.60                         PCD 18

Reaffirmed 2022

NATIONAL FOREWORD

This Indian Standard (Part 9/ Section 2) (Third Revision), which is identical with ISO 3794 : 1976 ‘Essential oils (containing tertiary alcohols) - Estimation of free alcohols content by determination of ester value after acetylation’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards after the draft finalized by the Fragrance and Flavour Ingredients Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 1952 as IS 326 ‘Methods of test for essential oils’ and subsequently revised in 1968 as ‘Methods of sampling and test for natural and synthetic perfumery materials’. The standard was revised again in 1986 when it was split into different parts for various requirements of essential oils. The requirement of determination of ester value after acetylation and free alcohols was covered under IS 326 (Part 9) : 1986, for which assistance was drawn from ISO/R 1241-1971 ‘Essential oils - Estimation of free alcohols content by determination of ester value after acetylation’ and BS 2703 : 1976 ‘Methods of test for essential oils’.

The Committee has now decided to completely align IS 326 (Part 9) with the International Standards available on the subject and publish them under dual numbering system. As the Indian Standard is already a part of series of standards, it further decided to publish IS 326 (Part 9) as two different sections. The other section is,

Section 1/ISO 1241 : 1996 Methods of Sampling and Test for Natural and Synthetic Perfumery Material Part 9 Determination of Ester Value and Free Alcohols, Section 1 Determination of ester values, before and after acetylation, and evaluation of the contents of free and total alcohols

Once all two sections of standard are published, existing IS 326 (Part IX) : 1980 will be withdrawn.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.