OLR (1988) 35 (6) C. Chemical Oceanography 535

88:3352 Sohrin, Yoshiki, Kenji Isshiki, Tooru Kuwamoto

and Eiichiro Nakayama, 1987. Tungsten in North Pacific waters. Mar. Chem., 22(1):95-103.

Here are reported the first tungsten depth profiles in oceanic waters. Tungsten concentration in the North Pacific is constant at 53-60 pmol L t from the surface to the bottom. Similar vertical profiles of tungsten and molybdenum probably result from the fact that both elements are hardly adsorbed at all onto organisms and particulate organic matter in surface waters. Although crustal abundance of tungsten and molybdenum are nearly equal, the concentration of tungsten is ~1/1800 of that of molybdenum in oceanic waters, indicating tungsten is removed from seawater much more rapidly than molybdenum, by adsorption onto ferric hydroxide, manganese oxide and clay minerals. Inst. for Chem. Res., Kyoto Univ., Uji, Kyoto 611, Japan.

C80. Physical chemistry in seawater

88:3353 Mackey, D.J., R. Szymczak, M. Tomczak Jr. and Y.

Gu, 1987. Effects of mixed-layer depth and an isolated coral reef on the strong complexing capacity of oligotrophic waters. A ust. J. mar. Freshwat. Res., 38(4):491-499.

Strong copper complexing capacity of seawater was determined along three transects enclosing Wreck Reef in the Coral Sea. Measurements of ship's drift and geostrophic calculations relative to 300 m indicated little surface water flowed through the reef system. The values of copper complexing capacity and dissolved organic carbon were similar to those within the Great Barrier Reef system. Within the top 100 m, values of complexing capacity ranged from 2.5-26 nM, the elevated values associated with a leeward deep mixed layer and possibly with proc- esses occurring within the reef itself. There was no correlation between copper complexing capacity and concentrations of nutrients or dissolved organic carbon; capacity within the euphoric zone was generally higher than that for surface waters of SE and NW Australia. Div. of Oceanogr., CSIRO, GPO Box 1538, Hobart, Tas. 7001, Australia.

CI00. Alkalinity, acidity, pH 88:3354

Dickson, A.G. and F.J. Millero, 1987. A comparison of the equilibrium constants for the dissociation of

carbonic acid in seawater media. Deep-Sea Res., 34(10A): 1733-1743.

The published experimental data of Hansson (1972, 1973) and of Mehrbach et al. (1973) have been critically compared after adjustment to a common pH scale based upon total hydrogen ion concen- tration. No significant systematic differences are found within the overall experimental error of the data. The results have been pooled to yield reliable equations that can be used to estimate pK~" and pK 2" for seawater media at salinities from 0 to 40 and at temperatures from 2 to 35°C. Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA.

Cll0. Radioactivity, radioisotopes 88:3355

Cai, Fulong, Ying Chen and Pi'an Xu, 1987. The migration process of radionuclides in artificial microhahitat. Acta oceanol, sin. (English version), 6(3):428-433. Third Inst. of Oceanogr., State Oceanic Admin., Xiamen, People's Republic of China.

88:3356 Caramella Crespi, V., N. Genova, S. Meloni and M.

Oddone, 1987. A rapid radiochemical procedure for uranium determination in natural waters. J. radioanalyt, nucl. Chem., 114(2):303-307. Centro CNR per la Radiochimica, Dipart. di Chimica Generale, Univ. di Pavia, Italy.

88:3357 Hunt, G.J., 1987. Radioactivity in surface and coastal

waters of the British Isles, 1986. Aquat. Environ. monit. Rept, 18:62pp.

Methods and results of the 1986 environmental monitoring of liquid radioactive waste discharge into the aquatic environment of the U.K. are presented, focusing on the SeUafield plant which, as in previous years, has contributed to the highest exposures principally from Cs and transuranics. Also included is a special section on freshwater monitoring for Chernobyl-associated radioactivity. Estimated pub- lic radiation exposures were all within the rec- ommended principal dose limit of 1 mSv y r ~. MAFF, Direct. Fish. Res., Lowestoft, UK. (gsb)

88:3358 Lapicque, Georges, H.D. Livingston, C.E. Lambert,

Edouard Bard and L.D. Labeyrie, 1987. Inter- pretation of ~9-~4°pu in Atlantic sediments with a non-steady state input model. Deep-Sea Res., 34(11A): 1841-1850.