HR: 1340h
AN: B33D-1073    [Abstracts]
TI: Seasonal Variation Of Chlorine In Run-off In A Small Catchment
AU: * Svensson, T
EM: tersv@ituf.liu.se
AF: Link”pings universitet, Department of Thematic Studies, Holmentorget 10, Norrk”ping, 601 74 Sweden
AU: Sand‚n, P
EM: persa@ituf.liu.se
AF: Link”pings universitet, Department of Thematic Studies, Holmentorget 10, Norrk”ping, 601 74 Sweden
AU: Bastviken, D
EM: davba@ituf.liu.se
AF: Link”pings universitet, Department of Thematic Studies, Holmentorget 10, Norrk”ping, 601 74 Sweden
AU: ™berg, G
EM: gunob@ituf.liu.se
AF: Link”pings universitet, Department of Thematic Studies, Holmentorget 10, Norrk”ping, 601 74 Sweden
AB: It is widely believed that chlorine does not participate in biological processes, and that it is present in the environment only as chloride ions. However, studies have indicate that the soil organic layer could act as a sink for chloride. In fact, there are increasing amounts of evidence suggests that chlorine is a part of a complex biogeochemical cycle. In spite of these new findings, there are yet no comprehensive studies of the major sources, sinks, and transport routes as well as of the underlying processes. Water samples were collected in a small catchment for analysis of organic chlorine, chloride and organic carbon, every second week (2003-2005). Our study adds increasing evidence that chloride is a part of a complex biogeochemical cycle. Further, we show that, 1) the output of organic chlorine is less from run-off than from top-soil, and 2) the organic matter is more chlorinated during the autumn, and 3) the major output of chlorine is chloride. In other words, the main output of chlorine is inorganic and the main pool in the system is organic, which infer that a conversion from chloride to organic forms is likely occurring. The seasonal variations of chlorine in run-off are consistent with previous data suggesting a net-formation during the autumn.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
SC: Biogeosciences [B]
MN: Fall Meeting 2005