Abstract
Fish otolith is a good recorder of water environment in which the fish lived. In order to identify the elements in otolith that are sensitive to environment and their enrichment rules, lab-culture experiments of carps were carried out. Pb, Hg and Cr were added separately into tanks in which the carps lived, and the tanks were named as Pb tank, Hg tank and Cr tank, respectively. Inductively coupled plasma mass spectrometer (ICP-MS) was used for measuring the concentrations of Pb, Hg and Cr in otolith and water. ICP-MS results of otoliths showed that the average, median, quartile and extreme values of Pb, Cr concentrations in otoliths obtained from Pb and Cr tanks are comparably higher than those obtained from other tanks. It showed that Pb and Cr in carp otoliths could respond to environment change as environment response sensitive elements can also be suitable for monitoring water pollution.
Highlights
Heavy metals are toxic substances that can induce water pollution
Inductively coupled plasma mass spectrometer (ICP-MS) results of otoliths showed that the average, median, quartile and extreme values of Pb, Cr concentrations in otoliths obtained from Pb and Cr tanks are comparably higher than those obtained from other tanks
It showed that Pb and Cr in carp otoliths could respond to environment change as environment response sensitive elements can be suitable for monitoring water pollution
Summary
Heavy metals are toxic substances that can induce water pollution. Even trace amount of heavy metals are very toxic, especially some substances with biological toxicity like Pb, Hg and Cr. Even trace amount of heavy metals are very toxic, especially some substances with biological toxicity like Pb, Hg and Cr They cannot be degraded by microbes, and can only be converted, dispersed or transferred among different forms. Heavy metals can be converted to certain organic metal compounds under microbial activity, and even be more toxic. The organic metal compounds are enriched by aquatic organisms, and enter human body through food chain. Heavy metal pollution has become an important research issue in recent years
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