TA7 Alkylphenols and Alkylphenol Ethoxylates
Room 18C/D, Level 4
8:00 AM - 12:00 PM, Tuesday, 11 November 2003
Chair: Loyo-Rosales, Jorge ,
(225) Bioavailability of 4-nonylphenol in the soil-water-plant system.
Düring, R.-A.1, Krahe, S1, Zhang, X1, Gäth, S1, 1 Institute of Resources Management, Heinrich-Buff-Ring 32, Giessen, Germany
ABSTRACT- The endocrine disruptor 4-nonylphenol accumulates in anaerobic digested sewage sludge. The agricultural utilization of such sludge (biosolid) is fostered by legislation of the US and the European Union. Potential paths of 4-nonylphenol from sewage sludge amended soil to the crop are not elucidated up to now. Systematic sorption experiments with a large set of soils yielded partition coefficients, and its dependence on humus content, pH, and other soil parameters was validated. By means of multiple linear regression analysis of some basic soil parameters, partitioning of 4-nonylphenol between soil and soil solution, which is the fraction available for plants, can be predicted. To assess the volatility of 4-nonylphenol, ratios of its concentration in solution and the concentration in the headspace above the solution were calculated. Radiolabeled 4-nonylphenol was applied in closed soil-plant systems on a laboratory scale and the distribution of 14-C was balanced. The experiments evidenced the uptake of gaseous 4-nonylphenol into plants via the leaves.
Key words: volatility, soil-water partitioning, plant uptake