OLR (t983)30 (12) C. Chemical Oceanography 915

removed during estuarine mixing; DOC showed either production or conservative behavior in the same areas, demonstrating that removal of DHA is a minor part of the estuarine transport of DOC. Laboratory salt-induced removal of DHA was insignificant in two of three estuaries studied; in-situ removal of DHA may not be universally caused by increasing salinity. Center for Earth and Planetary Phys., Harvard Univ., Cambridge, Mass. 02138, USA.

C150. Particulate matter

83:6684 Gardner, W.D., K.R. Hinga and John Marra, 1983.

Observations on the degradation of biogenic material in the deep ocean with implications on the accuracy of sediment trap fluxes. J. mar. Res., 41(2):195-214.

Experiments indicate that the decay of organic material inside and outside of sediment traps in the deep ocean is 0.1-1.0% day -~. This fact must be considered when using traps to determine the flux of organic material through the water column. A model is presented to quantify the loss of organic C at different decay rates and to determine optimum length of trap deployments. The use of poisons in traps is discussed. Lamont-Doherty Geol. Observ., Palisades, NY 10964, USA.

C180. Geochemistry, biogeochemistry (see also D-SUBMARINE GEOLOGY AND GEO- PHYSICS)

83:6685 Aller, R.C., 1983. The importance of the diffusive

permeability of animal burrow linings in deter- mining marine sediment chemistry. J. mar. Res., 41(2):299-322.

The diffusive permeability to small inorganic solutes of the thin organic layer lining the burrows of 8 species of marine invertebrates was measured; results showed diffusion coefficients to be 10-40% of those in free solution. Effects of reaction kinetics and ionic charge on solute permeability were examined. Burrow linings appear to act like molec- ular sieves, and could greatly influence the distri- bution of solutes in sediment. Dept. of Geophys. Sci., Univ. of Chicago, 5734 South Ellis Ave., Chicago, Ill. 60637, USA. (mjj)

83:6686 Borey, R.B., P.A. Harcombe and F.M. Fisher, 1983.

Water and organic carbon fluxes from an irreg- ularly flooded brackish marsh on the upper Texas coast, U.S.A. Estuar. coast. Shelf Sci., 16(4):379- 402. Texaco U.S.A., P.O. Box 1608, Port Arthur, Tex. 77640, USA.

83:6687 Burns, K.A. and J.-P. Villeneuve, 1983. Biogoo-

chemical processes affecting the distribution and vertical transport of hydrocarbon residues in the coastal Mediterranean. Geochim. cosmochim. Acta, 47(6):995-1006.

Particulates, plankton, fecal material and seawater were analyzed for non-volatile and chlorinated hydrocarbons. Among the findings: the distribution of fractions between dissolved and particulate phases depends on solution and sorption processes and is influenced by particle abundance and hydro- carbon solubility; biogeochemical processes modify hydrocarbon residues in the course of long distance transport; the biota not only package residues but modify them metabolically; particle flux through 100 m accounted for 17% of the PCB levels in sediments. International Lab. of Mar. Radioact., c /o Musee Oceanogr., Monaco. (msg)

83:6688 Koike, Isao and Hiroshi Mukai, 1983. Oxygen and

inorganic nitrogen contents and fluxes in burrows of the shrimps Callianassa japonica and Upogebia major. Mar. Ecol.-Prog. Ser., 12(2):185-190. Ocean Res. Inst., Univ. of Tokyo, Nakano, Tokyo 164, Japan.

83:6689 Prahl, F.G. and Roy Carpenter, 1983. Polycyclic

aromatic hydrocarbon (PAH)-phase associations in Washington coastal sediments. Geochim. cos- mochim. Acta, 47(6):1013-1023.

At least 20-25% of perylene and PAH derived from pyrolytic processes and 50% of the retene measured in whole sediment are contained within organic C- and lignin-rich particles (primarily vascular plant remains and bits of charcoal) of density < 1.9 g/cc, which comprise ~ 1% of the total sediment weight. Some methylated phenanthrene homologs, possibly of fossil origin, are concentrated in the denser lithic matrix of the sediment. Equilibrium models of PAH sorption/desorption from aqueous phase onto small particles of high surface area do not appear appli- cable in this environment. Sch. of Chem., Univ. of Bristol, Cantock's Close, Bristol BS8 ITS, UK.