Estimation of Uncertainty of Measured Residues and Testing Compliance with MRLs

Farkas, Zsuzsanna; Cook, Jo Marie; Ambrus, Árpád

doi:10.1142/9781786341693_0010

Cited by 7 publications

(6 citation statements)

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“…The variability of residues in individual crop units derived from a single field (called within field variability) is close to 80–100-fold [ 77 , 78 ], therefore increasing ‘n’ will decrease the uncertainty of the results and improve the accuracy of the estimated average residue in the sample. Under typical growing conditions the relative uncertainty of sampling is in the range of 25–40% for samples of size 10 and 5, respectively [ 79 , 80 ]. These uncertainties shall be considered when a product is tested before export.…”

Section: Methodsmentioning

confidence: 99%

Quality Control of Pesticide Residue Measurements and Evaluation of Their Results

et al. 2023

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Pesticide residues are monitored in many countries around the world. The main aims of the programs are to provide data for dietary exposure assessment of consumers to pesticide residues and for verifying the compliance of the residue concentrations in food with the national or international maximum residue limits. Accurate residue data are required to reach valid conclusions in both cases. The validity of the analytical results can be achieved by the implementation of suitable quality control protocols during sampling and determination of pesticide residues. To enable the evaluation of the reliability of the results, it is not sufficient to test and report the recovery, linearity of calibration, the limit of detection/quantification, and MS detection conditions. The analysts should also pay attention to and possibly report the selection of the portion of sample material extracted and the residue components according to the purpose of the work, quality of calibration, accuracy of standard solutions, and reproducibility of the entire laboratory phase of the determination of pesticide residues. The sources of errors potentially affecting the measured residue values and the methods for controlling them are considered in this article.

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Section: Methodsmentioning

confidence: 99%

Quality Control of Pesticide Residue Measurements and Evaluation of Their Results

et al. 2023

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“…Based on the evaluation of over 10,000 supervised trial results, Farkas and co-workers [38,41] concluded that a default action limit should be chosen at around 0.3 MRL to assure with about 95-98% probability that the sampled product would be accepted in the EU, taking into account the decision rule specified with equation 2.…”

Section: Assessment Of Compliance With Legal Limits (Mrl)mentioning

confidence: 99%

“…The relative sampling uncertainty (CV S ) varies between 1.2 and 1.7 in the case of fruits and vegetables [38,40]. Therefore, a default action limit of 0.3 MRL is recommended for general use to account for the sampling uncertainty.…”

Section: Assessment Of Compliance With Legal Limits (Mrl)mentioning

confidence: 99%

“…For the control of imported products, specific import MRLs apply, if available. However, when the results of pre-export control are evaluated, the combined uncertainty of the whole process, including that of sampling, ought to be considered [36] in combination with a properly selected action limit [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

“…The sampling uncertainty was determined based on analyses of over 10,000 duplicate supervised trial results [38,40]. The practical application of the action limit was explained in detail in a recent article [36].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Results of Pesticide Residue Analysis in Food Sampled between 2017 and 2021

et al. 2023

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As mandated by the EU and the national risk management duties, pesticide residues were determined by four specialized laboratories in 9924 samples taken from 119 crops of economic importance in Hungary and imported foodstuffs during 2017–2021. The screening method applied covered 622 pesticide residues as defined for enforcement purposes. The limit of detection ranged between 0.002 and 0.008 mg/kg. The 1.0% violation rate concerning all commodities was lower than in the European Union. No residue was detectable in 45.9% of the samples. For detailed analyses, six commodities (apple, cherry, grape, nectarine/peach, sweet peppers, and strawberry) were selected as they were analyzed in over 195 samples and most frequently contained residues. Besides testing their conformity with national MRLs, applying 0.3 MRL action limits for pre-export control, we found that 73% of the sampled lots would be compliant with ≥90% probability based on a second independent sampling. Multiple residues (2–23) in one sample were detected in 36–50% of the tested lots. Considering the provisions of integrated pest management, and the major pests and diseases of selected crops, normally three to four and exceptionally, seven to nine active ingredients with different modes of action should suffice for their effective and economic protection within four weeks before harvest.

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Distribution of pesticide residues in soil and uncertainty of sampling

Suszter

Ambrus

2017

Journal of Environmental Science and Health, Part B

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14Pesticide residues were determined in about 120 soil cores taken randomly from the top 15 15 cm layer of two sunflower fields about 30 days after pre-emergence herbicide treatments. 16Samples were extracted with acetone-ethyl acetate mixture and the residues were determined 17 with GC-TSD. Residues of dimethenamid, pendimethalin and prometryn ranged from 0.005 18 mg/kg to 2.97 mg/kg. Their relative standard deviations (CV) were between 0.66 and 1.13. 19The relative frequency distributions of residues in soil cores were very similar to those 20 observed in root and tuber vegetables grown in pesticide treated soils. Based on all available 21 information, a typical CV of 1.00 was estimated for pesticide residues in primary soil samples

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Estimation of Uncertainty of Measured Residues and Testing Compliance with MRLs

Cited by 7 publications

References 0 publications

Quality Control of Pesticide Residue Measurements and Evaluation of Their Results

Quality Control of Pesticide Residue Measurements and Evaluation of Their Results

Evaluation of the Results of Pesticide Residue Analysis in Food Sampled between 2017 and 2021

Distribution of pesticide residues in soil and uncertainty of sampling

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