Abstract
Rapida nd accuratem easuremenmt ethodsf or chemicals orptiono ntod ifferents oilt ypes are needed to evaluate transport and fate of hazardous chemicals in soils and for risk assessment of new chemicals. Retardation of seven Environmenta Ilm pact Chemicals (EICs) in five differents oilsw as measuredu sing a high performance liquid chromatograph (HPLC) micro-columnm ethod.The HPLC micro-columns ystemr equires only small amounts of soil (3g) and chemicals (0.02m Li mpulsei njection), and experiments are rapid and easy to perform compared to the traditional batch or larger-scale columne xperiments. Retardation factors for seven EICs (bentazone car bofuran, 2, 4-D, l inuron, simazine;all organicp esticides and nitrate and nitrite) were determined by HPLC micro-column method.The retardationf actors of the pesticides were mostly constant with varying flow velocity and concentration R.etardationf actorsf or five out of seven pesticidess howed a significant correlation with soil organic matter content. For comparison, traditional batch experiments were carried out for two pesticides and two soils.The retardation factor from batch experiments were generallyl arger than when determined by the micro-column method, suggesting non-equilibrium adsorption under the flow condition.
