Rochelle,

My lab informed me that they use method 6010C for non-Hg metals because
they do not put "dirty samples" such as baghouse dust into their 6020
MS.  

They also use 3500CR-D instead of 218.6 for Cr+6. 

Are these methods acceptable?

Also, what does "IDL" mean?  

Please advise,

Jeffrey S. Hummel, MS, CHMM

Sr. Environmental Engineer

(812) 279-7271

(812) 279-7367 (Fax)

  HYPERLINK "mailto:jeffrey.hummel@gm.com"  jeffrey.hummel@gm.com 

General Motors LLC

105 GM Drive, Bedford, IN 47421

_______________________________________________________________________

Rochelle: 

My responses (please share as broadly as needed): 

You may use SW 846 Method 6010C in lieu of Method 6020A for Hg analyses
with the caveat that if the lab finds values less than the IDL
documented for in accordance with the method, we would expect a
re-analysis with Method 6020A. 

For the determining the Cr6 content, we recommend ASTM D5451-93(2008)
the dust sampling, we recommend SW 846 Method 3060A and to Method 7195
or 7197 for analysis.  You may report data analyzed with Method 7196 if
you find levels above the test specific method detection level.  If
not, you should use one of the more sensitive methods.  Instead of
specifying a minimum expected  method level, we refer to specific
analytical methods, in this case, Method 7195 or Method 7197.  Please
report data in terms of the method detection level (e.g., below
detection level, BDL)  and not the method reporting limit.  

Peter Westlin

Measurement Policy Group

OAQPS, SPPD

919-541-1058

