Mercury associated with colloidal material in an estuarine and an open-ocean environment

被引:92
作者
Guentzel, JL [1 ]
Powell, RT [1 ]
Landing, WM [1 ]
Mason, RP [1 ]
机构
[1] UNIV MARYLAND, CHESAPEAKE BIOL LAB, SOLOMONS, MD 20688 USA
基金
美国国家科学基金会;
关键词
mercury; colloids; Hg speciation; ultrafiltration; cross-flow filtration;
D O I
10.1016/S0304-4203(96)00055-2
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have used traditional filtration and tangential flow ultrafiltration to isolate mercury into 4 size fractions: particulate (> 0.4 mu m), high molecular weight (> 10 kD, 1kD = 1000 daltons), medium molecular weight (1-10 kD), and low molecular weight (< 1 kD). Samples with varying salinities were collected from the Ochlockonee River/Estuary in January 1993 and 1994. A small set of open-ocean samples was collected and processed during the 1993 Baseline Survey Expedition for Trace Contaminants in the Atlantic Ocean, sponsored by the Intergovernmental Oceanographic Commission (IOC). Concentrations of total dissolved Hg down the estuary ranged from 30 to 3 pM. Total dissolved Hg measurements from the IOC cruise ranged from 0.5 to 2.5 pM. Colloidal Hg (> 1 kD) represented 35-87% of the total dissolved Hg within the estuary and 10-50% of the total dissolved Hg in the North Atlantic. Equilibrium Hg speciation modeling supports speculation that colloidal Hg is bound by thiol-type functional groups associated with the colloidal organic carbon.
引用
收藏
页码:177 / 188
页数:12
相关论文
共 54 条
[1]  
[Anonymous], 1976, MINEQL: a computer program for the calculation of chemical equilibrium composition of aqueous systems
[2]   BULK CHEMICAL CHARACTERISTICS OF DISSOLVED ORGANIC-MATTER IN THE OCEAN [J].
BENNER, R ;
PAKULSKI, JD ;
MCCARTHY, M ;
HEDGES, JI ;
HATCHER, PG .
SCIENCE, 1992, 255 (5051) :1561-1564
[3]   EVIDENCE OF THE PARTICLE CONCENTRATION-EFFECT FOR LEAD AND OTHER METALS IN FRESH-WATERS BASED ON ULTRACLEAN TECHNIQUE ANALYSES [J].
BENOIT, G .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1995, 59 (13) :2677-2687
[4]   PARTITIONING OF CU, PB, AG, ZN, FE, AL, AND MN BETWEEN FILTER-RETAINED PARTICLES, COLLOIDS, AND SOLUTION IN 6 TEXAS ESTUARIES [J].
BENOIT, G ;
OKTAYMARSHALL, SD ;
CANTU, A ;
HOOD, EM ;
COLEMAN, CH ;
CORAPCIOGLU, MO ;
SANTSCHI, PH .
MARINE CHEMISTRY, 1994, 45 (04) :307-336
[5]   DETERMINATION OF MERCURY IN SEAWATER AT SUB-NANOGRAM PER LITER LEVELS [J].
BLOOM, NS ;
CRECELIUS, EA .
MARINE CHEMISTRY, 1983, 14 (01) :49-59
[6]   MECHANISM OF IRON REMOVAL IN ESTUARIES [J].
BOYLE, EA ;
EDMOND, JM ;
SHOLKOVITZ, ER .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1977, 41 (09) :1313-1324
[7]   An intercomparison of cross-flow filtration techniques used for sampling marine colloids: Overview and organic carbon results [J].
Buesseler, KO ;
Bauer, JE ;
Chen, RF ;
Eglinton, TI ;
Gustafsson, O ;
Landing, W ;
Mopper, K ;
Moran, SB ;
Santschi, PH ;
VernonClark, R ;
Wells, ML .
MARINE CHEMISTRY, 1996, 55 (1-2) :1-31
[8]   THE DISTRIBUTION OF DISSOLVED AND PARTICULATE MERCURY IN 3 SIBERIAN ESTUARIES AND ADJACENT ARCTIC COASTAL WATERS [J].
COQUERY, M ;
COSSA, D ;
MARTIN, JM .
WATER AIR AND SOIL POLLUTION, 1995, 80 (1-4) :653-664
[9]   MERCURY IN THE RHONE DELTA AND ADJACENT MARINE AREAS [J].
COSSA, D ;
MARTIN, JM .
MARINE CHEMISTRY, 1991, 36 (1-4) :291-302
[10]   DISSOLVED MERCURY BEHAVIOR IN THE SAINT-LAWRENCE ESTUARY [J].
COSSA, D ;
GOBEIL, C ;
COURAU, P .
ESTUARINE COASTAL AND SHELF SCIENCE, 1988, 26 (02) :227-230