Texas and the NELAC Proficiency Testing Program

1
Texas and the NELAC Proficiency Testing Program

• Graham Jackson
• Technical Director
• Wibby Environmental

2
Presentation overview

• History of PT Program
• Status of TCEQs efforts on laboratory
  accreditation
• NELAC PT Program
• Which PTs Will You Need?
• 2005 PT Program Changes
• DMRQA

3

• Brief History
• of
• PT Program

4
History

• Late 70s EPA started DMRQA, WS and WP programs
• 1995- Decision to Privatize Program
• 1995-1998 EPA, NIST NVLAP and NELAC worked
  together to develop privatized program
• 1998 Last EPA programs
• 1999 First Privatized Programs

5
Comparison

• Old EPA Program
• WS, WP and Micro
• 252 analytes
• 2 WS per year
• 2 WP per year
• Radiochemistry Las Vegas Program
• No soil/HW PTs

6
Comparison

• NELAC PT Program
• WS, WP, SOIL/HW, Micro, Radiochemistry
• 456 analytes
• Expanding again in June 2005
• Every six months
• Success Two Acceptable results out of most
  recent three

7
Comparison

• State Specific Programs
• Up to 800 analytes
• WS, WP, SOIL/HW, Micro, UST
• Different acceptance criteria
• Different PT standard design criteria
• Wisconsin, California, New Jersey, Minnesota

8

• TCEQ and
• Laboratory
• Accreditation

9
TCEQ

• Legislation is in place authorizing laboratory
  accreditation
• Rules have been written
• Texas applied for recognition as a NELAC
  accrediting authority
• Submitted application August 2004
• On site assessment March 2005
• Should be accredited by August 2005

10
TCEQ

• TCEQ will begin accepting applications in 2005
• First labs accredited in 2006 or 2007
• Chapter 25, Subchapters A, B and C

11
Who is exempt

• On site or in house lab
• Must be inspected at least every three years by
  the TCEQ
• Performing work for on site facility
• Performing work for another company on site
  without compensation
• Performing work for charitable organization

12

• NELAC
• PT Program

13
Four documents

• Lab
• NELAC PT FOT Tables
• www.wibby.com
• NELAC Chapter 2 and Appendices
• http//www.epa.gov/nerlesd1/land-sci/nelac/profici
  ency.html

• PT Provider
• EPA National Standards for Water Proficiency
  Testing
• NIST Handbooks 150 and 150-19

14
NELAC PT Program

• Chapter 2
• 2.2 Major groups PT Providers, PTOB/PTPA, Labs,
  AAs
• 2.3 Requirements for PT Providers
• 2.4 2.5 Requirements for Labs
• 2.6 Evaluation of Results
• 2.7 Criteria for Accreditation

15
NELAC PT Program

• Chapter 2 Appendices
• A PT Provider Approval Criteria
• B PT Sample Design and Acceptance
• C PT Acceptance Criteria
• D PTOB/PTPA
• E Micro
• F WET
• G Radiochemistry
• H Field Air

16
NELAC PT Program

• PT Board
• Reports to NELAP
• Responsible for implementation of PT Program
• PTOB/PTPA
• Accredits PT Providers
• NIST NVLAP
• PT Providers
• Supply PT Standards

17
NELAC PT FOTs
18

• Which PTs
• Do You Need?

19
PT requirements

• NELAC
• If analyte is on your Scope of Accreditation and
• Analyte is listed in NELAC PT FOT tables

20
Start with yourScope of Accreditation

• Waste Water
• Method 200.7
• Analytes
• Al
• Sb
• Etc..

21
Cross reference to PT FOT Tables

• If analyte is on your Scope of Accreditation and
  in the applicable NELAC FOT Table, you need to
  analyze a PT that includes the analyte.
• Can use the same PT standard for multiple methods
• Ex ICP-OES and GFAA

22

• Successful
• PT Compliance

23
2 of most recent 3

• Only thing that matters is Acceptable
• Check for Error Acceptable
• Maintain record of two of most recent three and
  youre accredited

24
NELAC example
25

• Establishing
• Acceptance Limits

26
NELAC Acceptance Limits

• Fixed Limits
• 15
• Centered on assigned value (100 concentration)
• Regression equations
• Centered on expected mean recovery
• Regression equation SDs
• Combinations
• Centered on study mean
• Regression equation SDs

27
Regression equations
28
Acceptance Limits

• Y mx b
• a, b, c, d????
• Predicted mean (Assigned Value a) b
• Predicted SD (Assigned Value c) d
• WS Acceptance Limits Pred mean 2 Pred SD
• WP Acceptance Limits Pred mean 3 Pred SD
• Soil/HW Study mean 3 Study SD

29

• Why PTs
• Are
• Different

30
PTs and real samples

• PTs actually contain analytes (lots of them)
• Come in ampules and require dilution
• DQOs are different (from method and customer
  requirements)
• Very important (actual and perceived value)

31

• Recent
• Developments

32
Recent Developments

• NELAC PT Committee no longer exists
• INELA PT Committee develops criteria
• www.inela.org
• PT Board
• Implementation issues
• Four members
• PT Board Subcommittees
• FOT
• PTOB/PTPA
• NIST NVLAP to expand program
• New PTOB/PTPA will be added in 2005

33
New PTs

• WS and WP tables have been revised
• New tables will go into effect for all PT studies
  starting after June 1, 2005 including DMRQA
• New analytes
• DMRQA analytes remain the same as 2004
• Experimental Analytes
• New acceptance criteria

34
Accreditation

• Official PT tables
• Analytes have been added
• Acceptance criteria improved
• Errors in original tables corrected

35
Blue new Red changed
36
Experimental Tables

• New in 2005
• NELAC labs must analyze experimental analytes
• Do not need to pass
• Data gathering effort to develop defensible
  acceptance criteria

37
(No Transcript)
38

• DMRQA

39
DMRQA

• EPA program
• WPs are state programs
• Once a year demonstration of data quality
• Texas has responsibility for program in state

40
DMRQA

• DMRQA
• Not NELAC compliant
• Time frame is longer than 45 days
• Subset of WP analytes
• June 1, 2005 September 1, 2005

• WP
• Is NELAC compliant
• Can be used for DMRQA
• Must start after June 1, 2005
• Must finish before September 1, 2005
• June and July WP studies

41
Summary

• Begin now to establish record of two of most
  recent three
• PTs must be completed for every method on your
  Scope of Accreditation
• PTs must be completed for every analyte on NELAC
  FOT tables
• Understand nuances of PT program

42
Thank You!

• Chuck Wibby
• 303-940-0033, ext 201
• cwibby_at_wibby.com

Graham Jackson 303-940-0033, ext
214 gjackson_at_wibby.com
Ty Garber 303-940-0033, ext 203 tgarber_at_wibby.com