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Article Dans Une Revue Food Additives and Contaminants Année : 2011

Assessment of seasonality in exposure to dioxins, furans and dioxin-like PCBs by using long term food consumption data

Lydie Soler
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Philippe Verger
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WHO

Résumé

According to the European Food Safety Authority (EFSA) guidance related to uncertainties in dietary exposure assessment [The EFSA Journal (2006) 438:1-54], exposure assessment based on short term food consumption surveys, such as the survey INCAdiet history or 24-hour recalls or 2 days records, tend to overestimate the long term exposure because of important measurement uncertaintiesof the assumption that the dietary pattern will be similar day after day over life time. The aim of this study was to make an assessment of dietary exposure to polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) also called dioxins PCDD/F and PCBs dioxin-like using usingSECODIP data, a long term household purchase and consumption survey data collected by TNS-Secodip. Weekly purchases of the major dioxins and dl-PCB vector products of these contaminants were collected for 328 single person households, who participated at TNS-Secodip consumption surveys from 2003 to 2005 and who were single person households in order to better estimate their consumption. These data were combined with average contamination levels of food products. Weekly gross average exposure was estimated at 10.2 pg Toxic Equivalent (WHOTEQ)/kg Body Weight/week (95% confidence interval [9.6, 10.9]), and was mainly due to consumption of seafood and dairy products. According to the typical shape of the distribution of individual weekly exposures, it is sensible to fit an exponential law to these data. The mean value was therefore 12.1 pg WHOTEQ /kg BW/week. This value is higher than the arithmetic mean because it better takes into account the inter-individual variability. It was estimated that about 20% persons of this sample were having exceeding dietary intake sufficient to cause adverse effectsthe current Health Based Guidance Value. mainly due to high consumption of seafood and/or dairy products. Thanks to long survey duration (3 years) and the weekly recording of food intakesconsumption, it was possible to demonstrate the actual seasonality of dietary exposure to dioxins and dl-PCBs with a maximum between March and September; similar seasonality is observable for fish consumption. Autoregressive integrated moving average or ARIMA models were adjusted to the time series and it could be demonstrated that the number of times the upper limit of confidence intervals exceeds Provisional tolerable weekly intake (PTWI) is about 15 weeks per year in average Finally, compared to the results obtained from data collected in the short term surveys (one week), this study does not suggest that short term consumption surveys tend to overestimate the long-term exposure. Using a long time survey does not seems to be so beneficial to reduce the uncertainty associated with a dietary exposure assessment.

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Dates et versions

hal-00680018 , version 1 (17-03-2012)

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Max Feinberg, Lydie Soler, Sandrine Contenot, Philippe Verger. Assessment of seasonality in exposure to dioxins, furans and dioxin-like PCBs by using long term food consumption data. Food Additives and Contaminants, 2011, 28 (04), pp.502-512. ⟨10.1080/19440049.2011.553844⟩. ⟨hal-00680018⟩
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