32 February / March 2018


Figure 1a. TIC of strawberry matrix standard at reporting level (0.01 mg/kg for most pesticides).


Figure 1b. TIC of 2016 strawberry sample containing 16 pesticide residues (range 0.01 - 0.3 mg/kg) i.e. 15 positive MRM in red and 1 negative MRM in blue.


Figure 1c. XIC of boscalid (+MRM) for strawberry matrix standard at reporting level (0.01 mg/kg) and 2016 strawberry sample containing boscalid at 0.08 mg/kg.


thousand injections of crude extracts from a variety of matrices over approximately 9 months of continuous use.


The methodology was used throughout 2016 to analyse hundreds of fruit and vegetable samples as part of UK and EU monitoring programmes. A summary of the residues quantified and confirmed in 2016 is presented in Table 2.


Figure 2 shows the laboratory’s consistent performance in FAPAS proficiency tests (4 rounds) and EU proficiency tests (2 rounds) for LC/MSMS compounds in 2016. Z-scores must be in the range -2 to 2 to be acceptable. All 37 compounds in these proficiency tests that were analysed using this method had acceptable z-scores.


The consistent performance and stability of the instrument over time i.e. 100 injections using full acquisition method A incorporating polarity


Figure 2: SASA LCMSMS Proficiency Test Data 2016. Table 2: Summary of residue detected and quantified by LCMSMS in 2016 samples


Figure 1d. XIC of fludioxonil (+MRM) for strawberry matrix standard at reporting level (0.01 mg/kg) and 2016 strawberry sample containing fludioxonil at 0.1 mg/kg


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