IS 5062 : Part 7 : 2024/ISO 5073 : 2021 Brown Coals and Lignites - Methods of Test - Part 7 Determination of Humic Acids

ICS 73.040

PCD 07

NATIONAL FOREWORD

This Indian Standard (Part 7) (First Revision) which is identical to ISO 5073 : 2021 'Brown coals and Lignites - Determination of humic acids' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Solid Mineral Fuels and Solid Biofuels Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 2017, which was identical to ISO 5073 : 2013 'Brown coals and lignites - Determination of humic acids'. This revision is undertaken to align it with the latest version of ISO 5073 : 2021 'Brown coals and lignites - Determination of humic acids'.

The major changes incorporated in this revision are as follows:

a) Referenced documents have been updated;

b) Terms and definitions have been added;

c) Sample has been added;

d) Determination of humic acids in extracts has been amended;

e) Calculation and expression of results have been amended;

f) Precision has been amended;

g) Test report has been amended; and

h) Annex A has been amended.

Other parts in this series are:

Part 1 Determination of moisture content by the direct volumetric method

Part 2 Determination of ash

Part 3 Determination of the yields of tar, water, gas and coke residue by low temperature distillation

Part 4 Determination of yield of benzene-soluble extract - Semi-automatic method

Part 5 Determination of acetone-soluble material (resinous substances) in the benzene-soluble extract

Part 6 Determination of true relative density and apparent relative density

Part 8 Determination of moisture content,

Section 1 Indirect gravimetric method for total moisture;

Section 2 Indirect gravimetric method for moisture in the analysis sample

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'; and

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.