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CCQM OAWG, Michele M. Schantz, David L. Duewer, Willie E. May, Reenie M. Parris, Stephen Wise


Solutions of known mass fraction of organic analytes of interest are typically used to calibrate the measurement processes used in the determination of these analytes. Appropriate value assignments and uncertainty calculations for these calibration solutions are critical. For the Mutual Recognition Arrangement (MRA) developed by the CIPM, there are numerous Calibration and Measurement Capability Claims (CMCs) published in Category 3 Organic Solutions in the CIPM MRA Appendix C. Additional CMCs in this category are being proposed and reviewed. Evidence of successful participation in formal, relevant international comparisons is needed to support these claims. A CCQM pilot study conducted in 2004 was comprised of three parts: CCQM-P31a Organic Solution - Polycyclic Aromatic Hydrocarbons (PAHs), CCQM-P31b Organic Solution - Polychlorinated Biphenyl (PCB) Congeners, and CCQM-P31c Organic Solution - Chlorinated Pesticides. After review of the P31c results at the April 2004 Organic Analytical Working Group (OAWG) meeting (Sèvres 2004) and the October 2004 OAWG meeting (Beijing 2004), it was decided to proceed with a key comparison study for chlorinated pesticides in solution (CCQM-K39) with a concurrent second pilot study for the chlorinated pesticides in solution (CCQM-P31c.1). This Key Comparison study demonstrated a high level of equivalence in capabilities of the participating NMIs to successfully identify and measure four chlorinated pesticides (4,4'-DDE, 4,4'-DDT, lindane, and trans-nonachlor) in a solution using GC/MS-based methods. The chlorinated pesticides measured in CCQM-K39 were selected to be representative of various classes of pesticides typically used as calibrants in the determination of the chlorinated pesticides found in environmental samples and to provide the typical analytical measurement challenges encountered in the value-assignment of these pesticide calibration solutions.


CCQM, key comparison, K39, chlorinated pesticide, pesticide


OAWG, C. , Schantz, M. , Duewer, D. , May, W. , Parris, R. and Wise, S. (2005), CCQM –K39– DETERMINATION OF CHLORINATED PESTICIDES IN SOLUTION: FINAL REPORT, BIPM, [online],, (Accessed May 23, 2024)


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Created October 11, 2005, Updated October 12, 2021