Onderzoek naar buitenlucht concentraties aan 2,3,7,8-chloorgesubstitueerde dioxinen en furanen in Nederland. Deel IV: Gehalten in een randstedelijk gebied (Zegveld)
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Type
Report
Language
nl
Date
1994-04-30
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Title
Onderzoek naar buitenlucht concentraties aan
2,3,7,8-chloorgesubstitueerde dioxinen en furanen in Nederland. Deel IV:
Gehalten in een randstedelijk gebied (Zegveld)
Translated Title
[Determination of polychlorodibenzo-p-dioxins and
furans in ambient air from an urban area in the Netherlands (Part
IV).]
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Abstract
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This report describes the results of polychlorodibenzo-p-dioxins (PCDDs) and furans (PCDFs) measurements in ambient air in a rural area in the centre of the city conglomerate 'Randstad", about 30 km North of a large industrial area 'Botleck' and two large capacity refuse waste incinerators (Rotterdam and AVR). Measurements were performed near the village of Zegveld during the period of June and July 1993. Dioxin concentrations found varied between 5+-2 to 60+-15 fg TEQ/m3, depending on the wind direction and other weather conditions with an average value of 18+-18 fg TEQ/m3 (n=11). The high range levels were found in trajectories from the South-West, down stream from the incinerators, and relatively low levels (<5-10 fg TEQ/m3) in trajectories from West (North Sea), North and East. The long-term-average background level was calculated as 25+-5 fg TEQ/m3 based on estimates of mean concentrations in the four trajectory directions, weighed with the corresponding long-term-average distribution of wind directions. This background value corresponds fairly well with a predicted value of 35 fg/m3. Model calculations were based on the estimated national emissions and dioxin fluxes from abroad by the end of 1990. When results from both methods are mutually comparable and valid, the small difference might indicate a small, poorly significant dicline of dioxin levels in air in this part of the country during the past few years.
This report describes the results of polychlorodibenzo-p-dioxins (PCDDs) and furans (PCDFs) measurements in ambient air in a rural area in the centre of the city conglomerate 'Randstad", about 30 km North of a large industrial area 'Botleck' and two large capacity refuse waste incinerators (Rotterdam and AVR). Measurements were performed near the village of Zegveld during the period of June and July 1993. Dioxin concentrations found varied between 5+-2 to 60+-15 fg TEQ/m3, depending on the wind direction and other weather conditions with an average value of 18+-18 fg TEQ/m3 (n=11). The high range levels were found in trajectories from the South-West, down stream from the incinerators, and relatively low levels (<5-10 fg TEQ/m3) in trajectories from West (North Sea), North and East. The long-term-average background level was calculated as 25+-5 fg TEQ/m3 based on estimates of mean concentrations in the four trajectory directions, weighed with the corresponding long-term-average distribution of wind directions. This background value corresponds fairly well with a predicted value of 35 fg/m3. Model calculations were based on the estimated national emissions and dioxin fluxes from abroad by the end of 1990. When results from both methods are mutually comparable and valid, the small difference might indicate a small, poorly significant dicline of dioxin levels in air in this part of the country during the past few years.
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