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Bill Grimley OAQPS (919) 541-1065 Robin SegallOAQPS (919) 541-0893 Jeff Ryan ORD (919) 541-1437.

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Presentation on theme: "Bill Grimley OAQPS (919) 541-1065 Robin SegallOAQPS (919) 541-0893 Jeff Ryan ORD (919) 541-1437."— Presentation transcript:

1 Bill Grimley OAQPS (919) Robin SegallOAQPS (919) Jeff Ryan ORD (919)

2  EPA total Hg test methods ◦ Method 101A ◦ ◦ Method 29 ◦ ◦  Other recognized total Hg method(s) ◦ ASTM D Also known as Ontario Hydro Method ◦  Potentially useable method ◦ Method 30B ◦  Measurement considerations ◦ Traversing ◦ Paired trains

3  Hg P : Particulate-bound Hg  Hg +2 : Oxidized forms of gaseous Hg (HgCl 2, HgO, Hg(NO 3 ) 2 ?, HgSO 4 ?) Hg 0 : Elemental gaseous Hg  Hg T (Total) = Hg P + Hg +2 + Hg 0 ◦ Generally, what is measured by Methods 101A, 29, and ASTM D  Hg TG (Total Gaseous) = Hg +2 + Hg 0 ◦ Generally,what is measured by Hg CEMS and PS-12B (sorbent trap)

4  Determine compliance with total Hg emission limits  Also: ◦ Characterize a source’s emissions ◦ Evaluate control technology performance ◦ Process control

5  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 (Hg Part.) (Total Gaseous Hg)

7 (Hg Part.) (Total Gaseous Hg)

8 (Hg Part.) (Elemental Hg) (Oxidized Hg) (Elemental Hg)

9  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  Replacements needed:  Sections and (Prep of stds; sample analysis)  Section (QA/QC procedures) _________________________  Optional replacements:  &  &    Use instead:  Sections thru  Section ___________________ may replace with  thru  thru  either or  either or

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


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