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Overview of EPA-recognized Total Mercury (Hg) Test Methods

Overview of EPA-recognized Total Mercury (Hg) Test Methods. Bill Grimley OAQPS grimley.william@epa.gov (919) 541-1065 Robin Segall OAQPS segall.robin@epa.gov (919) 541-0893 Jeff Ryan ORD ryan.jeff@epa.gov

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Overview of EPA-recognized Total Mercury (Hg) Test Methods

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  1. Overview of EPA-recognized Total Mercury (Hg) Test Methods BillGrimley OAQPS grimley.william@epa.gov (919) 541-1065 Robin Segall OAQPS segall.robin@epa.gov (919) 541-0893 Jeff Ryan ORD ryan.jeff@epa.gov (919) 541-1437

  2. Topics • EPA total Hg test methods • Method 101A • http://www.epa.gov/ttn/emc/promgate/m-101a.pdf • Method 29 • http://www.epa.gov/ttn/emc/promgate/m-29.pdf • Other recognized total Hg method(s) • ASTM D 6784-02 Also known as Ontario Hydro Method • http://www.astm.org/Standards/D6784.htm • Potentially useable method • Method 30B • http://www.epa.gov/ttn/emc/promgate/Meth30B.pdf • Measurement considerations • Traversing • Paired trains

  3. What is Total Hg ? Sum of speciation fractions, defined as follows: • HgP : Particulate-bound Hg • Hg+2 : Oxidized forms of gaseous Hg(HgCl2, HgO, Hg(NO3)2?, HgSO4?) Hg0 : Elemental gaseous Hg • HgT (Total) = HgP + Hg+2 + Hg0 • Generally, what is measured by Methods 101A, 29, and ASTM D6784-02 • HgTG (Total Gaseous) = Hg+2 + Hg0 • Generally ,what is measured by Hg CEMS and PS-12B (sorbent trap)

  4. Why We Want to Measure Total Hg … • Determine compliance with total Hg emission limits • Also: • Characterize a source’s emissions • Evaluate control technology performance • Process control

  5. Manual Total Hg Methods … • Normally used for periodic determinations of source category emission compliance • Typically 1-2 hour long “snap shots” • Must be traversed • Expensive, labor intensive, delayed results

  6. EPA Method 101A (Hg Part.) (Total Gaseous Hg)

  7. EPA Method 29 (Hg Part.) (Total Gaseous Hg) (Total Gaseous Hg)

  8. ASTM D6784-02 (Total and SpeciatedHg) (Hg Part.) (Oxidized Hg) (Elemental Hg) (Elemental Hg)

  9. ASTM D6784-02 Total Hg Speciation Method • Has been used in previous EPA efforts (ICR) to characterize Hg emissions from US coal-fired electric utilities • Optimum characterization requires speciated Hg measurements at Pollution Control Device (PCD) inlet and outlet locations

  10. QA/QC DifferencesEPA Method 29 ASTM D6784-02 • Replacements needed: • Sections 7.5.33 and 11.1.3 (Prep of stds; sample analysis) • Section 9.2.3 (QA/QC procedures) _________________________ • Optional replacements: • 8.2.8 & 8.2.9.1 • 8.2.9.2 & 8.2.9.3 • 8.3.4 • 8.3.5 • Use instead: • Sections 13.4.1.1 thru 13.4.1.3 • Section 13.4.2 ___________________ may replace with • 13.2.9.1 thru 13.2.9.3 • 13.2.10.1 thru 13.2.10.4 • either 13.3.4 or 13.3.6 • either 13.3.5 or 13.3.6

  11. Other Sampling Techniques • EPA Method 30B: The “Sorbent Trap Reference Method” : Hg (TG) +? Potential for non-isokinetic biases, but method might be included as regulatory option, with conditions/modifications Capable of both speciated and total gaseous Hg measurements

  12. Sorbent Trap Sampling Train Sample Console

  13. Summary • All Mercury methods: • Added detail (vs. Method 5) • Added effort ( ditto ) • Produce results of demonstrated accuracy and precision

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