[Effects of heavy metal (copper and cadmium) coupled with Ulca pertusa on marine inorganic carbon system in simulated experiments].
Simulated experiments coupled with ocean biota dynamics were performed in laboratory. In these experiments, effects of heavy metal (copper and cadmium) coupled with Ulca pertusa on marine inorganic carbon system and CO2 fluxes were investigated. The results indicated that concentration changes (delta) of components in carbon dioxide system with time scale were correlated with the concentrations and kinds of heavy metal. In copper groups and cadmium groups (0.1 micromol x L(-1) and 1 micromol x L(-1)), DIC HCO3- and PCO2 significantly decreased comparing to the control experiment data( p = 0.01). However, when the heavy metal infusions were higher than the "critical concentration", the above mentioned parameters increased with time scale and their increments followed the uptrend with increasing heavy metal concentrations. The "critical concentration" in copper groups was much lower than that in cadmium groups, which attributed to the tolerance diversity of Ulca pertusa to copper and cadmium. Furthermore, CO2 fluxes under the influences of heavy metal were also regularly changed with time. Sea waters with low infusions of heavy metal represented as sinks to the atmosphere CO2. These sinks would probably convert into CO2 sources after a period of time. Sea waters with comparatively high amount of heavy metal were always to be CO2 sources, and their release fluxes of CO2 augmented along with the increasing infusions of heavy metal.
Zheng
Guo-xia
GX
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. lingxunai@sina.com
Song
Jin-ming
JM
Dai
Ji-cui
JC
D000465:Algorithms; D001673:Biodegradation, Environmental; D044822:Biodiversity; D002104:Cadmium / Q000737:chemistry / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism*; D003300:Copper / Q000737:chemistry / Q000378:metabolism; D056890:Eukaryota / Q000254:growth & development / Q000378:metabolism*; D019216:Metals, Heavy / Q000737:chemistry / Q000378:metabolism*; D012623:Seawater / Q000032:analysis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002245:Carbon Dioxide; D003300:Copper