Standard: 2003 NELAC
Link to relevant standard
b) Calibration shall be verified for each compound, element, or other discrete chemical species, except for multi-component analytes such as Aroclors...
A laboratory is saying that they do not need to run a Chlordane standard to report non-detect chlordane results because of this NELAC Quality Systems Chapter 5 statement. They are saying that the auditors allow it. No continuing calibration is required for SW-846 Method 8082?
TNI FINAL RESPONSE:
(Quality System Expert Committee/NELAP Accreditation Council, x-x-10)
It is important to read the entire Standard, not just a single phrase. The full language of the referenced section is as follows: "Calibration shall be verified for each compound, element, or other discrete chemical species, except for multi-component analytes such as Aroclors, Total Petroleum Hydrocarbons, or Toxaphene where a representative chemical related substance or mixture can be used." The requirement is that a representative chemical related substance or mixture is to be used to verify the calibration.
If a representative substance were used, such as alpha or gamma Chlordane in lieu of Technical Chlordane, that would meet the requirements of this section.