Summary
The EC Directive on Drinking Water includes a maximum admissible concentration (MAC) for pesticides of 0.1 μg 1-1 which applies to virtually any pesticide, and an MAC of 0.5 μg 1-1 for so-called total pesticides. Problems arise in the development of suitable methods because of two basic difficulties; there are hundreds of pesticides that could be monitored and the MAC sets difficult analytical performance requirements - ie a method needs to be reasonably accurate at the level of interest (around 20% total error at 0.1 μg 1-1) and have a detection limit of 0.01-0.02 μg 1-1.
In our work we have considered the pesticides used in the UK and based our analytical methods, as far as possible, on those used in high amounts and/or likely to reach drinking water sources. We have endeavoured to produce methods which meet the performance requirements specified above. Since there are many pesticides to monitor it is in general impractical to use methods specific for individual or small groups of pesticides, and consequently, we are developing multi-residue techniques. Because of the need to be certain of the identity of the pesticide being detected in a sample at the very low concentrations implied by the Directive, mass spectrometric detection was found to be essential.
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Fielding, M., Gibby, S., Moore, K. (1991). Multiresidue Analysis of Pesticides in Drinking Water and Related Samples. In: Angeletti, G., Bjørseth, A. (eds) Organic Micropollutants in the Aquatic Environment. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3356-2_14
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DOI: https://doi.org/10.1007/978-94-011-3356-2_14
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