ICS 71.100.60                         PCD 18

Reaffirmed 2022

NATIONAL FOREWORD

This Indian Standard (Part 11/ Section 1) (Third Revision), which is identical with ISO 1271 : 1983 ‘Essential oils - Determination of carbonyl value - Free hydroxylamine method’ 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 for ‘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 for determination of carbonyl value and content of carbonyl compounds was covered under IS 326 (Part 11) : 1986, for which assistance was drawn from following ISO standards:

a) ISO 1271 : 1983 Essential oils - Determination of carbonyl value- Free hydroxylamine method

b) ISO 1279 : 1973 Essential oils - Determination of carbonyl compounds content - Hydroxylammonium chloride method

The Committee has now decided to completely align IS 326 (Part 11) with the above mentioned International Standards 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 11) as two different sections. The other section is,

Section 2/ ISO 1279 : 1996 Methods of sampling and test for natural and synthetic perfumery material Part 11 Determination of carbonyl value, Section 2 Potentiometric methods using hydroxylammonium chloride

Once all two sections of standard are published, existing IS 326 (Part 11) : 1986 will be withdrawn.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.