Composition of organic matter in bottom sediments from the Antarctic sector of the Atlantic Ocean

We identify geochemical features of sedimentary organic matter in various morphostructural zones of the Antarctic sector of the Atlantic. We present background geochemical organic parameters for shelf and deep-sea sediments from the Weddell and Scotia Seas and the Bransfield Strait. Geochemical organic parameters are good indicators of environmental and facial variations in sediments and could be used for environmental monitoring of the World Ocean.

Water chemistry and fluffy layer geochemistry and mineral content at four sites in the western Baltic Sea

The fluffy layer was sampled repeatedly during nine expeditions between October 1996 and December 1998 at four stations situated along a S-N-transect from the Oder Estuary to the Arkona Basin. Geochemical and mineralogical analyses of the fluff show regional differences (trends) in composition, attributed to provenance and to hydrographical conditions along their transport pathways. Temporal variability is very high at the shallow water station of the estuary, and decreases towards the deeper stations in the north. In the shallow water area, intensive resuspension of the fluff due to wind-driven waves and currents leads to an average residence time of only one to two days. Near-bottom lateral transport of the fluff is the main process that transfers the fine grained material, containing both nutrients and contaminants, from the coastal zone into the deeper basins of the Baltic Sea. Seasonal effects (e.g. biogenic production in relation to trace metal variation) are observed at the Tromper Wiek station, where the residence time of the fluffy material is in the scale of seasons. Thus, the fluffy layer offers suitable material for environmental monitoring programs.

Evaluation of the Technicon block digestor system for total kjeldahl nitrogen and total phosphorus /

Issued Feb. 1978.

Development of a strategy for sampling tree rings /

Mode of access: Internet.

Biotransformation and chemical form of mercury in plants /

Bibliography: p. 7-9.

Comparison of methods for the determination of total available residual chlorine in various sample matrices /

Bibliography: p. 28-29.

Distribution of phytoplankton in Alabama lakes /

Issued July 1977.

Status and quality of radiation measurements : food and human urine /

Issued Oct. 1977.

Distribution of phytoplankton in Virginia lakes /

Mode of access: Internet.

Distribution of phytoplankton in Mississippi lakes /

Mode of access: Internet.

Distribution of phytoplankton in South Carolina lakes /

Mode of access: Internet.

Supplementary radiological measurements at the Maxey Flats radioactive waste burial site, 1976-1977 /

Issued Sept. 1978.

Proposed system for determining NPDES and NIPDWR method equivalency.

Mode of access: Internet.

Air monitor siting by objective /

Issued June 1978.