OLR(1979) 26(I 2) B. Chemical Oceanography 769

Sediment diffusion coefficients can be calculated bv correcting solution diffusion coefficients with tortuosities deduced from electrical resistivity measurements. Studies of the counter-diffusion of KBr and KCI through inert and ion-exchanging porous beds are described. Good agreement between diffusion coefficients obtained by monitoring the chemical composition in the experimental apparatus and those calculated from resistivity measurements is found. Department of Earth and Planetary Sciences, Room 54-1326, Massachusetts Institute of Technology. Cambridge, Mass. 02139, U.S.A.

79:5923 Nakamura, Akio and Takashi Kashimoto, 1979.

Determination of total organic nitrogen and organometallic nickel in oil, sediments and marine products. Bull. environ. Contamin. Toxicol., 22(3): 345-349.

To detect the presence of contaminating oil in the marine environment, organic nitrogen and organic nickel were measured in heavy oil and marine samples by a digital nitrogen analyzer and flameless atomic absorption spectrometry. The relation between nitrogen content and organometallic Ni was evaluated, Laboratory of Food Chemistry, Osaka Prefectural Institute of Public Health, Nakamichi, Higashinari-ku, Osaka 537, Japan. (bwt)

79:5924 Reid, D. F., R. M. Key and D. R. Schink, 1979.

Radium, thorium, and actinium extraction from seawater using an improved manganese-oxide- coated fiber. Earth planet. Sci. Lefts, 43(2): 223-226.

Experimental evidence is presented which demonstrates that a method using MnO-coated acrylic fibers can quantitatively extract radium, thorium and actinium from small-volume seawater samples. The method greatly reduces sample handling, sample volume and analytical blanks. Code 334, N O R D A / N S T L Building 1105, NSTL Station, Miss. 39529, U.S.A. (bwt)

79:5925 Visser, H., 1979. Teledetection of the thickness of

oil films on polluted water based on the oil fluorescence properties. Appi. Opt., 18(11): 1746-1749.

Results of a laboratory study on 32 crude and heavv fuel oils are presented which show the feasibility of thickness determination of oil films on water bv remote sensing of fluorescence. Excitation of the oils at 337 nm and 633 nm revealed measuring ranges of several tens to hundreds of micrometers: extension of the ranges appears possible with infrared radiation and intermediate excitation wavelengths. TNO-TH Institute of Applied Physics, P.O. Box 155, 2600 AD Delft, The Netherlands. (bwt)

2. Surveys (data reports, area studies)

79:5926 Kremling, K., C. Otto and H. Petersen, 1979.

Spurenmetall-Untersuchungen in den F6rden der Kieler Bucht: Datenbericht von 1977/78. [Trace metal investigations in the fjords of the Kiel Bight: data 1977/78.] Ber. /nst. Meeresk. Christian-Albrechts-Univ., 66:38 pp.

The results of analyses of 220 water samples taken from 33 stations in the fjords of the Kiel Bight during 1977 and 1978 are reported. Data on 22 parameters are presented along with a description of sampling and analytical techniques. Institut ffir Meereskunde, Abt. Meereschemie, Diisternbrooker Weg 20 2300 Kiel, F.R.G. (bwt)

3. Composition of sea water

79:5927 Aubert, M., J. Ph. Breittmayer and P. Revillon, 1979.

Le mercure en M~diterran6e centrale. [Mercury in the central Mediterranean.] Revue int. Oc~an- ogr. M~d., 53/54: 33-39.

It appears that in the Mediterranean Sea, mercury concentrations are higher than average for seawater. Volcanism, geological composition of the shores and industrial discharges are all contaminant contributors. C.E.R.B.O.M.-I.N.S.E.R.M., U. 40, I avenue Jean Lorrain, Nice, France.

4. Physical chemistry in sea water

79:5928 Allanson, B. R. and S. Rudd, 1979. New tables for

the first and second apparent dissociation con- stants K 1' and K 2' of carbonic acid for estuarine and brackish waters. Estuar. coast, mar. Sci., 5(8): 495-498. Institute for Freshwater Studies, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa.

79:5929 Maclntyre, Ferren, 1978. On the temperature coeffi-

cient of Pco2in seawater. Clim. Change, 1(4): 349-354.

The commonly reported partial pressure of CO2 in seawater applies only to deep water and not to surface water which can exchange CO2 with the atmosphere. Including an appropriate value for air-sea exchange (which must specify the depth of the exchanging surface layer) will lower the partial pressure by approximately a factor of ten, a factor which will greatly influence modelling of atmospheric CO2. Graduate School of Oceanography, University of Rhode Island, Kingston, R.I. 02881, U.S.A. (bwt)