Estimation of sample processing uncertainty for chlorpyrifos residue in cucumber

TİRYAKİ O., Baysoyu D.

ACCREDITATION AND QUALITY ASSURANCE, vol.10, no.10, pp.550-553, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 10 Issue: 10
  • Publication Date: 2006
  • Doi Number: 10.1007/s00769-005-0070-z
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.550-553
  • Keywords: sample processing, uncertainty, sampling constant, PESTICIDE-RESIDUES
  • Çanakkale Onsekiz Mart University Affiliated: Yes


Sample processing is a very important component of uncertainty in analytical results. In order to have reliable results, the laboratory sample should be properly processed to obtain statistically homogenous matrix-before the representative test portions are withdrawn for analysis. The use of (14)C-labeled compound is preferable because the analyte can be quantified without cleanup. The method is based on surface treatment of cucumber with (14)C-chlorpyrifos, determination of (14)C-chlorpyrifos activity in the replicate test portions of different size, and determination of the uncertainty of sample processing.