ASTM D6784

ASTM D6784 is a technical standard for measuring elemental, oxidized, particle-bound, and total mercury in flue gas generated from coal-fired stationary sources. It is commonly associated with the Ontario Hydro Method and is used to support consistent mercury measurement in emissions-related testing. By defining a structured approach to mercury fractionation, the standard helps users obtain results that are more comparable, repeatable, and suitable for compliance and engineering decisions.

ASTM D6784 standard overview

This ASTM standard provides a test method focused on mercury in flue gas from coal-fired stationary sources, including multiple mercury forms rather than total mercury alone. That distinction is important because mercury may exist in elemental, oxidized, and particle-bound fractions, each of which can behave differently in gas streams and control systems. ASTM D6784 is therefore relevant when a more detailed mercury profile is needed for emissions assessment, method selection, or technical evaluation tied to stack testing and air-quality compliance work.

Where is ASTM D6784 used?

ASTM D6784 is typically used in testing programs for coal-fired stationary sources where flue-gas mercury measurements are required. It is especially relevant in stack sampling, emissions monitoring, and environmental compliance workflows involving power generation or similar combustion systems. The method may also be used by laboratories, plant operators, and environmental consultants that need a standardized way to assess mercury fractions in flue gas and compare results across repeated tests or different facilities.

Practical importance of ASTM D6784

In practice, this standard supports more reliable mercury data for compliance, reporting, and technical decision-making. Because it addresses multiple mercury forms, ASTM D6784 can help reduce uncertainty when evaluating control performance or comparing emissions results over time. For procurement and testing specifications, it provides a clear reference that can improve consistency between laboratories and projects. That makes it useful for quality control, method alignment, and risk reduction in flue-gas mercury measurement programs.

• Mercury fractionation in flue gas
• Coal-fired stationary source testing
• Stack sampling and emissions assessment
• Ontario Hydro Method reference
• Compliance-oriented laboratory analysis