Meriläinen Päivi, Lahdelma Ilpo, Oikari Laura, Hyötyläinen Tarja, Oikari Aimo
Department of Biological and Environmental Sciences, University of Jyväskylä, Survontie 9, Ambiotica Building, Jyväskylän Yliopisto, Finland.
Chemosphere. 2006 Oct;65(5):840-6. doi: 10.1016/j.chemosphere.2006.03.024. Epub 2006 May 2.
The dissolution potency of hydrophobic resin acids (RAs), retene and wood sterols from sediments was studied. These wood extractives and their metabolites are sorbed from pulp and paper mill effluents to downstream sediments. With harmful components like these, sediments can pose a hazard to the aquatic environment. Therefore, sediment elutriates with water were produced under variable conditions (agitation rate and efficiency, time), and concentrations of the dissoluted compounds were analyzed. Both naturally contaminated field sediments and artificially spiked sediments were studied. By vigorous agitation RAs can be released fast from the sediment matrix and equilibrium reached within 3 days. Compared to RAs, desorption of retene from lake sediment was slower and did not completely reach equilibrium in 23 days. Sterols spiked to pristine sediment with a 33-day contact time desorbed faster than those associated authentically with industrial sediment of from a contaminated lake. Simulating the water turbulence adjacent to a sediment surface by low and high rate of agitation in the laboratory, an increase in the mixing rate after 43-day elutriation suddenly released a high amount of wood sterols. The results indicate wide variation between hazardous chemicals in their tendency to dissolution from sediment solids. Erosion and hydrology adjacent to the sediment surface, as well as risks from dredging activities of sediments, may expose lake biota to bioactive chemicals.
研究了沉积物中疏水性树脂酸（RAs）、惹烯和木甾醇的溶解潜能。这些木材提取物及其代谢产物从制浆造纸厂废水中吸附到下游沉积物中。含有这类有害成分的沉积物会对水生环境构成危害。因此，在不同条件（搅拌速率和效率、时间）下制备了沉积物与水的淘析液，并分析了溶解化合物的浓度。研究了天然受污染的现场沉积物和人工加标的沉积物。通过剧烈搅拌，RAs可快速从沉积物基质中释放出来，并在3天内达到平衡。与RAs相比，惹烯从湖泊沉积物中的解吸较慢，23天内未完全达到平衡。添加到原始沉积物中并接触33天的甾醇比那些真实存在于受污染湖泊工业沉积物中的甾醇解吸得更快。在实验室中通过低速和高速搅拌模拟沉积物表面附近的水流紊动，43天淘析后搅拌速率的增加突然释放出大量木甾醇。结果表明，有害化学物质从沉积物固体中溶解的趋势差异很大。沉积物表面附近的侵蚀和水文状况，以及沉积物疏浚活动带来的风险，可能会使湖泊生物群接触到生物活性化学物质。
