NATIONAL FOREWORD

This Indian Standard [P:159] which is identical with ISO 20884 : 2011‘Petroleum products — Determination of sulfur content of automotive fuels — Wavelength-dispersive X-ray fluorescence spectrometry’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Methods of Sampling and Test for Petroleum, its Products, Gaseous Fuels and Lubricants Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

The Committee responsible for formulation of this Indian standard felt that for the analysis of Motor Gasoline, suitable components for the matched matrix diluents also include n-heptane, 2,2,4-trimethylpentane,etc and hence decided to substitute clause 4.2 of the ISO standard, with the following:

“4.2 Diluent oil

The reference diluent oil is white oil (light paraffin oil) of high purity grade, with a sulfur content of 0.5 mg/kg,maximum. However, if only one type of matrix is to be analysed (e.g. motor gasoline), accuracy of results may be improved by using a matrix matched diluent. These should match approximately the aromatic and oxygen content of the material to be analysed, and should consist of high purity components of less than 0.5 mg/kg sulfur content.

NOTE Suitable components for the matched matrix diluent include n-heptane, 2,2,4-trimethylpentane, toluene, xylenes, ethanol, methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME)” Following Indian standards also exists for determination of sulphur:

i) IS 1448(Part 33) Methods of test for petroleum and its products: Part 33 Sulphur by Bomb method

ii) IS 1448 (Part 34) Methods of test for petroleum and its products: Part 34 Determination of Sulphur in Petroleum Products Lamp Method

iii) IS 1448 (Part 160)/ISO 20846 Methods of test for petroleum and its products:Part 160 Determination of sulphur content of automotive fuels — Ultraviolet fluorescence method

iv) IS 1448 (Part 161)/ISO 13032 Methods of test for petroleum and its products: Part 161 Determination of low concentration of sulphur in automotive fuels —Energy-dispersive x-ray fluorescence spectrometric method

User of the standard may decide suitability of the method as per the requirement given in the respective product specifications. Many of the product specifications also indicate the referee method in case of dispute.

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.