858 C. Chemical Oceanography OLR (1984) 3 ! (12)

to be related to their structure while humic acids appear to interact with Cu regardless of structure. Cd interacts only with mature, highly crosslinked humic acids. NOAA, AOML, 4301 Rickenbacker Causeway, Miami, Fla. 33149, USA.

84:6008 Wang, Shuchang, Youngchen Wang and Bingyi Sun,

1981. Stability constants of hydroxide complexes of Zn, Pb and Cd in KNO 3 solution. J. Shandong Coll. Oceanol., 11(4): 15-21. (In Chinese, English abstract.) Dept. of Mar. Chem., Shandong Coll. of Oceanol., People's Republic of China.

84:6009 Zhang, Zhengbin, Liansheng Liu and Chen-tung

Chen, 1984. Linear free energy relationships in marine chemistry. I. Seawater systems. Ocean- ologia Limnol. sin., 15(1):68-80. (In Chinese, English abstract.)

A new method for deriving linear free energy relationships is presented and used to confirm relationships between the stability constants of ion-pair/complex ions (e.g., Me-C1, Me-OH), metal-humic acids, trace metal-marine particles, and 'solution hydroxo stability' constants. Use of the method in estimating marine physico-chemical constants is discussed. Shandong Coll. of Oceanol., People's Republic of China. (mjj)

CLIO. Radioactivity, radioisotopes 84:6010

Jones, D.G., J.M. Miller and P.D. Roberts, 1984. The distribution of 137Cs in surface intertidal sediments from the Solway Firth [NE Irish Seal. Mar. Pollut. Bull., 15(5): 187-194. Geochem. and Petrology Div., Inst. of Geol. Sci. (NERC), Keyworth, Nottingham, NG125GG, UK.

84:6011 Mann, D.R. and S.A. Casso, 1984. ln-situ chemi-

sorption of radiocesium from seawater. Mar. Chem., 14(4):307-318.

Cs (stable and radioactive) is partially stripped from seawater as it passes in series through a tandem cartridge consisting of twin beds of ion exchange resin impregnated with cupric ferrocyanide. When seawater passes through this cartridge at a constant flow-rate, collection efficiencies of each bed are the same, allowing calculation of the Cs nuclide con- centration. The cartridge is made of inexpensive, readily available, PVC pipe fittings and is easily deployed under various field conditions. Thousands

of liters of seawater can be stripped of Cs, sub- stantially improving the sensitivity of measurement of ~34Cs and mCs. WHOI, Woods Hole, Mass. 02543, USA.

C130. Organic compounds 84:6012

D'Arrigo, J.S., 1984. Surface properties of micro- bubble-surfactant monolayers at the air/water interface. J. Colloid Interface Sci., 100(1):106- 111.

The existence of long-lived microbubbles in natural waters has been postulated for many years. The surface properties of the microbubble-surfactant complex are studied using a Langmuir trough apparatus. Biologically derived glycopeptide-acyl lipid complexes form a highly insoluble monolayer at the air-water interface under appropriate salinity and pH conditions. Dept. of Appl. Math., Australian Natl. Univ., Canberra, 2600 Australia. (bwt)

84:6013 D'Arrigo, J.S., C. Saiz-Jimenez and N.S. Reimer,

1984. Geochemical properties and biochemical composition of the surfactant mixture surrounding natural microbubbles in aqueous media. J. Colloid Interface Sci., 100(1):96-105.

Hydrophobic surfactants in an aqueous extract from soil are characterized by elemental, infrared, x-ray diffraction and pyrolysis mass spectroscopic anal- ysis. Oxygen group/metal ion interactions appear likely. The surfactants appear to be heterogeneous glycopeptide-lipopolysaccharide complexes; the gly- copeptide probably is derived from chlorophyll- protein material of green algae and higher plants. Dept. of Appl. Math., Australian Natl. Univ., Canberra 2600, Australia. (bwt)

84:6014 Repeta, D.J. and R.B. Gagosian, 1984. Transfor-

marion reactions and recycling of carotenoids and chlorins in the Peru Upwelling region (15°S, 75°W). Geochim. cosmochim. Acta, 48(6):1265- 1277.

Fucoxanthin, diadinoxanthin, diatoxanthin, caro- tene, and peridinin constitute >95% of the total carotenoid pigments in suspended particulate matter samples. Sediment trap and zooplankton fecal pellet samples contained significant amounts of carotenoid transformation products. The distribution of specific transformation products within the samples suggests that heterotrophic ester hydrolysis is a general