Surficial Redistribution of Fallout 131iodine in a Small Temperate Catchment

Isotopes of iodine play significant environmental roles, including a limiting micronutrient (127I), an acute radiotoxin (131I), and a geochemical tracer (129I). But the cycling of iodine through terrestrial ecosystems is poorly understood, due to its complex environmental chemistry and low natural abundance. To better understand iodine transport and fate in a terrestrial ecosystem, we traced fallout 131iodine throughout a small temperate catchment following contamination by the 11 March 2011 failure of the Fukushima Daiichi nuclear power facility. We find that radioiodine fallout is actively and efficiently scavenged by the soil system, where it is continuously focused to surface soils over a period of weeks following deposition. Mobilization of historic (pre-Fukushima) 137cesium observed concurrently in these soils suggests that the focusing of iodine to surface soils may be biologically mediated. Atmospherically deposited iodine is subsequently redistributed from the soil system via fluvial processes in a manner analogous to that of the particle-reactive tracer 7beryllium, a consequence of the radionuclides’ shared sorption affinity for fine, particulate organic matter. These processes of surficial redistribution create iodine hotspots in the terrestrial environment where fine, particulate organic matter accumulates, and in this manner regulate the delivery of iodine nutrients and toxins alike from small catchments to larger river systems, lakes and estuaries

Imposing Procedural Constraints on State Administrative Agencies: An Empirical Investigation of Competing Explanations

Scholars have offered different explanations for administrative procedures. One general approach stresses the importance of normative theory as a determinant of institutional choice, while two other perspectives emphasize the interests and political influence of pressure groups and legislators. To test these models, this study uses comparative state data to predict the adoption of three types of administrative procedures-legislative rule review, procedural requirements opening up the rulemaking process to public participation, and economic impact analysis. The findings suggest that factors associated with the adoption of one kind of administrative requirement may not be associated with the use of others. The analysis also suggests that, while ideology, political culture, and party competition intermittently affect the adoption of particular administrative procedures, they do not always have the kinds of effects that are suggested by the traditional state policy making literature. Copyright 1992 by The Policy Studies Organization.