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Accreditation and Quality Assurance

, Volume 23, Issue 4, pp 243–250 | Cite as

Validation of an in-house measurement procedure for determination of selected priority hazardous substances in water and estimation of measurement uncertainty

  • Marijana Kragulj Isakovski
  • Jelena Molnar Jazić
  • Snežana Maletić
  • Aleksandra Tubić
  • Jasmina Agbaba
  • Jelena Tričković
  • Božo Dalmacija
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Abstract

This study investigates measurement procedure validation for the determination of hexachlorobenzene, pentachlorobenzene and trifluralin as priority hazardous pesticides in water with suspended solids  < 12 mg/L by liquid–liquid extraction with hexane and gas chromatography with electron capture detector analysis. Two water matrices were used: synthetic matrix and a natural matrix—Danube surface water. Limit of detection was in the range 2.2 ng/L–3.9 ng/L. Trueness expressed as recovery was determined at pesticide concentrations of 20 ng/L and 50 ng/L in both water matrices. The intermediate precision was determined as relative standard deviations (RSD) and represents an agreement between replicates. Trueness was 72 %–121 % with RSD < 20 %. Expanded uncertainty of measurement was similar for all compounds (33.3 %–37.5 %) with a 95 % confidence level, for coverage factor k = 2. The validity of the measurement procedure was confirmed by participation in a PT Scheme with satisfactory |z|-score smaller than 2. Based on these results, it can be concluded that this low-cost measurement procedure is fit for the intended use measurements.

Keywords

Pentachlorobenzene Hexachlorobenzene Trifluralin GC/µECD Validation of measurement procedure 

Notes

Acknowledgements

The project was financed by the kind support of the Provincial Secretariat for Science and Technological Development of the Autonomous Province of Vojvodina (142-451-2452/2018).

Supplementary material

769_2018_1334_MOESM1_ESM.docx (1.1 mb)
Supplementary material 1 (DOCX 1123 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Marijana Kragulj Isakovski
    • 1
  • Jelena Molnar Jazić
    • 1
  • Snežana Maletić
    • 1
  • Aleksandra Tubić
    • 1
  • Jasmina Agbaba
    • 1
  • Jelena Tričković
    • 1
  • Božo Dalmacija
    • 1
  1. 1.Department of Chemistry, Biochemistry and Environmental Protection, Faculty of SciencesUniversity of Novi SadNovi SadRepublic of Serbia

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