IS 11255 : Part 16 : 2025/ISO 5409 : 2024 Methods for Measurement of Emission from Stationary Sources - Part 16 Chemical Absorption Method for Sampling and Determining Mercury Species in Flue Gas

ICS 13.040.40

CHD 35

NATIONAL FOREWORD

This Indian Standard (Part 16) which is identical to ISO 5409 : 2024 'Stationary source emissions - Chemical absorption method for sampling and determining mercury species in flue gas' issued by the International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on the recommendation of the Air Quality Sectional Committee and approval of the Chemical Division Council.

Mercury is a highly toxic environmental pollutant that bio accumulates in the food chain and can have an impact on neurological health. Most of the anthropogenic mercury is emitted from stationary sources such as coal combustion plants, cement kilns, non-ferrous metal smelting operations, and waste incineration facilities. The monitoring and control of mercury mass emissions from stationary sources is increasingly important for preventing global environmental pollution and health damage caused by mercury.

This part 16 specifies a method for the sampling and determining mercury species in flue gas passing through ducts or chimney stacks. Mercury generally exists in gaseous elemental form, gaseous oxidized form and particulate-bound form. This method applies to the sampling and determination of gaseous elemental mercury (Hg0), gaseous oxidized mercury (Hg2+), particulate-bound mercury (Hg P) and total mercury (Hg T) in the flue gas from stationary sources.

This Indian standard has been published in several parts. The other parts in this series are:

Part 1 Particulate matter

Part 2 Sulphur dioxide

Part 3 Flow rate

Sec 2 Automated measurement systems

Part 4 Hydrogen sulphide and carbon disulphide

Part 5 Total fluoride

Part 6 Ammonia

Part 7 Oxides of nitrogen

Part 10 Calibration of automated measuring systems for greenhouse gases

Part 11 Ongoing quality control of automated measuring systems of greenhouse gases

Part 12 Determination of the mass concentration of dinitrogen monoxide (N2O) - Reference method: non-dispersive infrared method

Part 13 Automatic method for the determination of methane concentration using flame ionization detection (FID)

Part 15 Determination of the methane concentration using gas chromatography

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions and terminologies 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 in the International Standard, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.