Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ‘Plastics - Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Methods of Sampling and Test for Plastics Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 2009 and subsequently revised in 2018. The first revision of this standard was identical with ISO 17556 : 2012. The second revision of this standard has been undertaken to align it with the latest version of ISO 17556 : 2019. In this revision, the major changes are as follows:

a) the unit for BOD, COD and DIC has been corrected (see 3),

b) the formula for calculating the percent biodegradation has been modified (see 9.1.1),

c) the test period has been revised to two years at the longest (see 4), and

d) the number of replicates has been corrected to three (see 9.2).

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and 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.