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    A comparison of the old and new wet-only samplers of the Dutch National Precipitation Chemistry Monitoring Network

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    Authors
    van der Swaluw E
    Verboom JH
    Berkhout JPJ
    Stolk AP
    Hoogerbrugge R
    Series/Report no.
    RIVM report 680704012
    Type
    Onderzoeksrapport
    Language
    en
    
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    Title
    A comparison of the old and new wet-only samplers of the Dutch National Precipitation Chemistry Monitoring Network
    Translated Title
    Een vergelijking van de oude en nieuwe regenwatervangers van het Landelijk Meetnet Regenwatersamenstelling
    Publiekssamenvatting
    Regenvangers meten in regenwater zowel verzurende (zwavel) als vermestende (stikstof) stoffen en zware metalen. Uit onderzoek van het RIVM blijkt dat oude en nieuwe regenwatervangers nagenoeg dezelfde hoeveelheden stoffen in regenwater meten. Hierdoor zijn voor verzurende en stikstofhoudende stoffen data over langere tijd beschikbaar (langjarige tijdreeksen), waarmee het effect van beleidsmaatregelen kan worden gemonitord. De concentraties van de zware metalen komen minder goed overeen: voor lood, cadmium en koper worden met de nieuwe regenwatervangers lagere concentraties gemeten. Deze afwijkingen zijn echter dermate gering dat de data van de oude regenvangers wel voor langjarige tijdreeksen kunnen worden gebruikt. Voor lood is dit niet altijd het geval. Vooral op station De Zilk is de geconstateerde sprong in de langjarige tijdreeks hiervoor te groot.
    In januari 2006 zijn de oude regenvangers uit eind jaren tachtig van de vorige eeuw van het Landelijk Meetnet Regenwatersamenstelling vervangen door nieuwe. Het RIVM heeft de metingen met de nieuwe apparatuur in 2004-2006 uitgevoerd en vergeleken met de resultaten van de oude regenvangers uit deze zelfde periode.
    Uit een nadere beschouwing van het verschil in de gemeten concentraties voor lood en cadmium is geen expliciete verklaring gekomen. De lagere resultaten van de nieuwe apparatuur lijken wel plausibeler. Ze komen onder meer beter overeen met metingen van deze stoffen in regenwater in de ons direct omliggende landen.

    Wet-only samplers measure both acidifying (sulfur) as well as eutrophying (nitrogen) components and heavy metals. Research performed by RIVM has shown that the old and new wet-only samplers measure nearly similar concentrations of these chemical components in rain water. For acidifying and eutrophying components this yields data over long periods (long-term time series), which can be used to monitor the effects of policies. The concentrations found for heavy metals are in less agreement: for lead, cadmium and copper, the new wet-only samplers measure lower concentrations in rain water. The deviations are however small, therefore the obtained long-term time series can still be used. For lead this is not always the case. Especially for the lead concentrations measured at monitoring station De Zilk, the difference in the wet-only samplers yields a break in the time series.
    In January 2006 the old wet-only samplers from the eighties of the last century have been replaced with new wet-only samplers in the Dutch National Precipitation Chemistry Monitoring Network. RIVM has performed simultaneous measurements with the old and new wet-only samplers in the period 2004-2006. The results of these measurements have been analyzed and compared.
    A more detailed analysis has been performed in order to explain the differences found in the concentrations for lead and cadmium. No explanation was found. The lower concentrations as found with the new wet-only samplers seem more plausible, since there is better agreement with the measurements in precipitation in nearby countries.
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    VROM
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