dr. paul n. boothe senior scientist albion environmental college station, tx

A L B I O N E N V I R O N M E N T A L

U.S. EPA REGION SIX & U.S. EPA REGION SIX & OKLAHOMA & ARKANSAS DEPARTMENTS OF ENVIRONMENTAL QUALITYOKLAHOMA & ARKANSAS DEPARTMENTS OF ENVIRONMENTAL QUALITY

2424thth ANNUAL PRETREATMENT PROGRAM WORKSHOP ANNUAL PRETREATMENT PROGRAM WORKSHOP

EVERYTHING YOU WANTED TO KNOW EVERYTHING YOU WANTED TO KNOW ABOUT CLEAN MERCURY AND ABOUT CLEAN MERCURY AND

METALS SAMPLING BUT HOPED METALS SAMPLING BUT HOPED YOU’D NEVER HAVE TO ASKYOU’D NEVER HAVE TO ASK

Dr. Paul N. BootheDr. Paul N. BootheSenior ScientistSenior Scientist

Albion EnvironmentalAlbion EnvironmentalCollege Station, TXCollege Station, TX

13 AUGUST 200813 AUGUST 2008 OKLAHOMA CITY, OKOKLAHOMA CITY, OK


PRESENTATION OUTLINE• What do you need to know about mercury (Hg) &

metals in your wastewaters and receiving waters?– How can clean sampling and analysis help you?

• Clean Hg & metals sampling & analysis techniques– Background

• Focus on low-level Hg sampling & analysis– Collecting mercury-free samples: Tiered approach

• DEMONSTRATION Paragould Arkansas– EPA low-level Hg methods: EPA 1631E & EPA 245.7

• Where do you go from here?– Implementation of a low-level Hg monitoring program

• Conclusions• Q & A


What did you need to know about Hg & metals in your wastewaters & receiving waters? - “The Good Ole Days (2003)”

• Very little– Ignorance is bliss?– Non-detects are your friend.

• Still largely conventional sampling and analysis metals data– Relatively high detection limits- mostly ND’s– False positives due to contamination during

sampling and analysis contamination and other anomalies


“THE HANLON MEMO”“… in the light of existing regulatory

requirements for NPDES permitting, only the most sensitive methods such as Methods 1631E and 245.7 are appropriate in most instances for use in deciding whether to set a permit limitation for mercury and for sampling and analysis of mercury pursuant to the monitoring requirements within a permit.”

James A. Hanlon, Director EPA Office of Wastewater Management August 23,2007


“THE HOSCH MEMO” EPA Region 6 has “… revised the MQL’s

(Minimum Quantification Levels) which we will be accepting for EPA issued permits. … Region 6 expects that you (delegated States) will revise your procedures to incorporate these revised MQL’s” into your permitting procedures.

Claudia V. Hosch, Chief EPA Region 6 NPDES Permits and TMDL’s Branch February 8, 2008


HOW CAN CLEAN SAMPLING & ANALYSIS HELP YOU?

• Does your WWTP have metals limits?– Would you like to be able to accurately measure metals at the

levels at which you are being regulated? • Would you like to know how close you are to violating your permit

limits?• Would you like to avoid metal limits?• Would you like to know how well your WWTP is

operating in terms of metals removal?– Would you like higher, site specific technically based local

limits?• Would you like to know how much your effluent

discharge is affecting metals levels in the receiving waters (i.e. reasonable potential dterminations)?


Pretreatment Local LimitsMetal Conventional EPA

Surrogate Data (mg/L)Clean Metals Site

Specific Data (mg/L)Ratio Clean/Conventional

Cd 0.008 0.052 6.5

Cu 0.061 1.66 27.2

Hg 0.0012 0.0066 5.5

Pb 0.049 0.19 3.9

Zn 0.18 3.58 19.8


WHO IS ALBION ENVIRONMENTAL?• One of the most experienced low-level mercury

& metals laboratories in the U.S.– Helped the EPA “write the book” on clean sampling

and analysis• Acknowledged by name as significant contributor to EPA

1631E, 1638 (ICP-MS) and other “1600 series” clean methods• Participated in validation studies for EPA 245.7 & 1638

– “Re-writing the book” on dissolved Hg & metals filtration

– One of the most inter-calibrated labs• NELAC PT samples plus USGS, LAMPS, EPA split sample

studies, etc.– AE frequently supplies clean Hg & metals sampling

equipment to the U.S. EPA Office of Water in support of new national rulemaking initiatives


WHY CLEAN CHEMISTRY• Greater Data Accuracy (no “false positives”)

– Conventional data quality a continuing concern

• Enhanced Data Precision• Lower Detection Limits

– Minimize Number of “Non-Detects”– Minimize Use of Surrogate Data– Eliminate inaccurate receiving water data

• Accurate & Site Specific Removal Efficiencies and Background Loads


CLEAN METALS CHEMISTRY• Comprehensive field and laboratory

quality assurance (QA)/ quality control (QC) procedures and samples– Clean sampling and storage procedures

• TIERED APPROACH- TAILOR EFFORT TO DATA QUALITY OBJECTIVES (USABILITY)

– Clean, sensitive analytical methods

• Focuses on data accuracy


COMPREHENSIVE QA• Cradle to grave• EPA 1600 series methods:

– Equipment blanks (sampler and bottle)– Field QA/QC: Blanks and duplicates– Lab QA/QC: Blanks, matrix spike/ matrix

spike duplicate, blank spikes, reference materials, duplicates (optional)

– Instrument calibration– Failsafe documentation– Stringent acceptance criteria


CLEAN SAMPLING METHODS• EPA Method 1669 April 1995

– Written for Hg- worst case scenario– Onsite filtered dissolved measurements a driver

• Carefully cleaned plasticware• Clean hands & dirty hands approach

– Wear powder-free gloves– Adapt to or control airborne particulates

• On-site filtration for dissolved measurements

• Low detection limits require low blanks


EPA DISSOLVED METALS & HG GUIDANCE• New “15 Minute Rule” for dissolved trace metals

(Footnote 7)– “For dissolved metals, filter grab samples within 15 minutes of collection

and before adding preservatives. For a composite sample collected with an automated sampler … filter the sample within 15 minutes after completion of collection and before adding preservatives ...”

• Exception for dissolved mercury (Footnote 17)– “A sample collected for dissolved trace level mercury (< 100 ng/L) should

be filtered in the laboratory within 24 hours of the time of collection.” – “However, if circumstances preclude overnight shipment, the sample

should be filtered in a designated clean area in the field in accordance with procedures given in Method 1669.”

– “If sample integrity will not be maintained by shipment to and filtration in the laboratory, the sample must be filtered in a designated clean area in the field within the time period necessary to maintain sample integrity.”

• Information in TABLE II takes precedence over information in specific methods or elsewhere.

Source: Method Update Final Rule, Part 136, Table II Required Containers, Preservation Techniques and Holding Times. Federal Register 72(47): 11236-11239. Effective 4-12-2007.


Side-by-side East Texas Sites (2-3 April 2008)Diss. Mercury vs Filter Type

0

2

4

6

8

10

12

Angelina R. Taylor Bayou PIB @ SH 69

Hg

(ppt

r) Total Rec.ACMSK SyringeGeotechGelman


CLEAN HG SAMPLING DEMO• Paragould LW&C, Paragould Arkansas

– Ms. Lisa Ellington– Ms. Ashley Barr

• “Ultra-clean” approach• Manual grab sampling procedures

– In-lab gravimetric flow-proportioned compositing


CLEAN COMPOSITE SAMPLING


EPA APPROVED DISSOLVED HG & METALS FIELD SAMPLING KIT


CLEAN ANALYSIS METHODOLOGY• EPA series 1600 methods issued 1995-96

– ICP/MS, STGFAAS, CVAFS (Hg), Hydride AAS (As)

• Contamination always a concern• Sample digestion a problem area• Direct analysis (“clean”) vs

extraction/preconcentration (“ultraclean”)• Select analytical labs carefully


CLEAN ANALYSIS METHODS• Clean preservation & digestion (chemical & uv)

• EPA 1631e and EPA 245.7 for low-level Hg

• EPA 1638/ 200.8 ICP-MS– “Work Horse” method for remaining priority pollutant

metals• EPA 1632 (mod) hydride generation atomic

fluorescence for dissolved As & Se

• EPA 1640 (mod) preconcentration inductively coupled plasma- mass spectrometry (ICP-MS)– Dissolved Cd, Cu, Ni, Pb, Zn


EPA METHOD 1631E• Low-level mercury

– Purge & trap/ Cold vapor atomic fluorescence– Reporting limit (ML) 0.0005 ppb (MDL 0.0002 ppb)

• Approved for CWA use November 2002– Driven by Great Lakes Initiative (WQC 1.3 pptr)

and National Toxics Rule (WQC 12 pptr)• Most difficult clean method to perform

– Ease of contamination at sub-pptr level is great– Good results achievable using good equipment

and guidance


EPA 1631E vs 245.7Method 1631 Method 245.7

Status Approved 40 CFR part 13611-32-2002

Approved 40 CFR part 136MUR 4-12-2007

Digestion BrCl / SnCl2 /NH2OH•HCl

KBr /KBrO3 /SnCl2 /NH2OH•HCl

Separation Vapor SeparationGold Trap

Vapor SeparationDryer Tube (Nafion)

Detection CVAFS CVAFS

MDL / ML 0.2 / 0.5 ng/L 1.8 / 5.0 ng/L

Range 0.5 – 100 ng/L 5 – 100 ng/L


STARTING A CLEAN HG MONITORING PROGRAM

• Decide how much assistance you want or need– Continuum: turnkey to using all in-house

resources– Optimal compromise:

• Specialized clean equipment and analysis laboratory (vendor)

• All sampling done using in-house personnel with level of training needed from specialized lab


OPTIMAL SAMPLING PROCEDURE• Use in-house personnel who are interested in

the challenge• Use reliable, blanked bottles & equipment• Powder-free gloves (multiple easy change)• Ground cover & all plastic sampling gear• Clean outer clothes• CleanBox• Don’t skimp on field blanks or field dups

– Field blanks exactly same as samples• Don’t sample in the rain• Ground shipping


BETWEEN A ROCK & A HARD PLACE

• EPA 1631E FULL METHOD COMPLIANCE CHALLENGING– Is a rigorous, onerous and difficult method

to perform according to EPA guidance – From our experience full method compliance

is poor in most commercial labs• Discharge Monitoring Report (DMR)

“Catch 22”– Permittee responsible for submitting valid

data


QUESTIONS TO ASK POTENTIAL 1631E LABORATIES

• “Innocent”, non-leading questions to see what the prospective lab knows:

• # 1: What modifications have they made to promulgated method in their implementation of EPA method 1631E?• # 2: Ask for suggested compliant sampling plan• # 3: Ask for sample data report including narrative• # 4: Ask for recent reports for ALL performance test (PT) sample programs they participate in• # 5: Ask about turnaround time (TAT)• # 6: Ask for raw instrument data run log


CONCLUSIONS• Clean Hg and metals methods coming

– Adaptable to virtually any sampling scenario– You can make them work to your advantage

• Use of trained in-house personnel is optimal• Use EPA 1631E not EPA 245.7

– Can report 1631E data at MQL of 5 pptr if needed• Chose your equipment and laboratory vendor

carefully– No field preservation, no icing, no expedited

shipping allows you to use any clean metals or Hg lab you want to


QUESTIONS?

Paul N. Boothe, PhD.ALBION ENVIRONMENTAL

4505 Boyett StreetBryan, TX 77801-4614

(979) 268-2677 [email protected]

dr. paul n. boothe senior scientist albion environmental college station, tx

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