special issue on humic and fulvic compounds

OLR (1990) 37 (12) C. Chemical Oceanography 1101

Except in the case of sudden floods, riverine DOC varied slightly and is apparently not related to river flow variations. In seawater, marked seasonal vari- ations were observed (March minimum, mid-sum- mer maximum). Because of industrial inputs in the upper estuary, DOC concentrations are erratic and higher than those in the river. The net DOC flux to the Bay of Brest is ~600 t yr -t. None of the endogenic processes significantly affect DOC con- centration during estuarine transport. The difference between net and gross fluxes are in good agreement with anthropogenic inputs. IFREMER, Cir. de Brest, Dept. Environ. Littoral, B.P. 70, 29280 Plouzane, France.

90:7020 Buffle, J. (guest editor) et al., 1990. Special issue on

humic and fuivic compounds. Analytica chirn. Acta, 232(1):237pp; 18 papers.

The study of fulvic and humic compounds, which constitute most of soil, water, and sediment organic matter, is complicated by the large number of compounds that comprise the group and the diver- sity of chemical properties exhibited. This special issue presents papers on the determination and characterization of fulvic and humic compounds, with an emphasis on new approaches. Included are sections on determination of sources, spectroscopic analysis methods, physical properties, physicochem- ical reactivity, and modelling of acid-base and complexation reactions. Soil, sediment, and fresh- and marine-water environments are examined. (gsb)

90:7021 Delmas, D., M.G. Frikha and E.A.S. Linley, 1990.

Dissolved primary amine measurement by flow injection analysis with o-phthaldialdehyde: com- parison with high-performance liquid chromatog- raphy. Mar. Chem, 29(2-3):145-154.

We found a very good agreement between the methods for most of the samples; however, where ammonia greatly overbalances dissolved free amino acid concentrations, such as pore waters from reduced environments, the method was invalid. Despite this limitation, the flow injection analysis with OPA appeared to be a promising procedure for primary amine study as very good sensitivity (~0.1 tiM) and reproducibility were obtained from ana- lyses which took only 1 rain per sample. Cir. de Rech. en Ecol. Mar. et Aquaculture de l ' t toumeau (CNRS-IFREMER), Case 5, 17137 Nieul sur Met, France.

90:7022 Jeng, W.-L., 1989. Fatty acids as tools for geochem-

istry and marine environmental quality. Acta oceanogr, taiwan., 23:43-52.

Eleven northern Taiwan Strait marine sediments and forty-five terrestrial samples were analyzed for fatty acids. A two end-member (land and sea) assumption is made to estimate the terrestrial fatty acid con- tribution to Taiwan Strait sediments (~50%). The ratio of branched-chain to lower molecular weight fatty acids is employed to evaluate the quality of the marine environment around Taiwan. Inst. of Oceanogr., Natl. Taiwan Univ., Taipei, Taiwan.

90:7023 Kojima, Shigeaki and Suguru Ohta, 1989. Particulate

organic carbon supply to the sea bottom: stable carbon isotope ratio analysis of the sediment trap samples at the mouth of Otsuchi Bay, north- eastern Japan. J. oceanogr. Soc. Japan, 45(6): 361-368. Ocean Res. Inst., Univ. of Tokyo, Minamidae l-chome 15-1, Nakano-ku, Tokyo 164, Japan.

90:7024 Malcolm, R.L., 1990. The uniqueness of humic

substances in each of soil, stream and marine environments. Analytica chim. Acta, 232(1): 19-30.

Definitive compositional differences are shown to exist for both fulvic acids and humic acids from soil, stream and marine environments by five different methods. Definitive differences found between fulvic acids and humic acids within each environment are more readily discerned because the method em- ployed for the isolation of humic substances from all environments excludes most non-humic components and results in more purified humic isolates. The major compositional aspects of fulvic acids and humic acids which determine the observed char- acteristic differences in each environment are the amounts and compositions of saccharide, phenolic, methoxyl, aromatic, hydrocarbon, amino acid and nitrogen moieties. USGS, Denver Fed. Cir., Denver, CO 80225, USA.

C140. Nutrients

90:7025 Degobbis, Danilo, 1990. A stoichlometric model of

nutrient cycling in the northern Adriatic Sea and its relation to regeneration processes. 3Iar. Chem~ 29(2-3):235-253.

The model differs significantly from a widely accepted 'oceanic' model mainly because of sedi- ment denitrification, different regeneration rates of P and N vs. biogenic St, and a P deficiency in decomposing organic matter. In water masses, mainly in surface layers, in which freshwater nutri- ent input and phytoplankton assimilation are dom-