PREDICTING TOXIC METAL SORPTION

预测有毒金属吸附

• 批准号: 3876757
• 负责人: DOMINIC M. DITORO
• 金额: --
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3876757
• 关键词: adsorption; cadmium; chromium; diffusion; environmental toxicology; ground water; heavy metals; mercury; model; nickel; particle; soil pollution; suspensions; water pollution

This research is aimed at developing a three component model of heavy metal adsorption and desorption to soils and suspended particles. No comprehensive method exists to predict from soil or particle properties the extend of adsorption, and more importantly, the extent and quantity of total desorbable metal. no empirical rules exist for estimating either adsorption or desorption partition coefficients. Yet these parameters are of critical importance in establishing the rate at which chemicals migrate from contaminated Superfund sits and the resulting concentration in the ground water. Hence the extent of exposure to humans via ground water is directly tied to the magnitude of these parameters. In surface water the fraction of total chemical that is dissolved is similarly determined by the partition coefficient. Since only dissolved chemical is directly bioavailable this parameter controls the exposure concentration of the biota. Hence it directly influences the extent of bioaccumulation of chemicals. The development of the model will be based on three site description of sorption. The metals being considered, nickel, cadmium, mercury and chromium, are the same as in the other components of this research project. The Langmuir binding strength and capacity constant parameters will be related to the quantity of extractable amorphous iron and manganese oxides and organic carbon in the soil. The desorbable fraction of the metals will be determined by a hydroxylamine extraction which has been successful in quantifying the bioavailability and sediment - interstitial water partitioning of metals in lakes and estuarine sediments. It is anticipated that the results of this component will provide the sorption isotherm parameters and desorbable fractions to the modeling component for use in the fate and transport models.

本研究的目的是建立一个三组分的重质 土壤和悬浮颗粒对金属的吸附和解吸。 没有 存在一种综合的方法来根据土壤或颗粒特性进行预测 吸附的程度，更重要的是， 总的可解吸金属。 没有经验规则存在估计 吸附或解吸分配系数。 然而这些 参数对于确定 化学物质从受污染的超级基金中迁移出来， 地下水的浓度。 因此， 人类通过地下水直接关系到这些规模 参数 在地表水中， 溶解类似地由分配系数确定。 以来 只有溶解的化学品是直接生物可利用的，该参数控制 生物群的暴露浓度。 因此，它直接影响 化学品的生物累积程度。 该模型的开发将基于三个站点的描述， 吸附作用 被考虑的金属，镍，镉，汞和 铬，与本研究的其他成分相同 项目 Langmuir结合强度和容量常数参数 将与可提取的无定形铁的量有关， 锰氧化物和土壤中的有机碳。 可脱附部分 的金属将通过羟胺萃取测定， 成功地量化了生物利用度和沉积物- 湖泊和河口金属的间隙水分配 沉积物 预计这一部分的成果将 将吸附等温线参数和可解吸部分提供给 用于最终结果和迁移模型的建模组件。