Abstract
Some creatures are very sensitive to water borne pollutants and can be used as useful bio-indicators of water pollutions. The present study used these bio-indicators to determine the status regarding health of freshwater habitats. The study was carried out to quantify Zn in kidney and liver of Rana tigrina from different aquatic habitats (canal, fish pond and sewage water) by atomic absorption spectrometry (AAS). Liver and kidney tissues of R. tigrina from sewage habitat showed elevated levels of Zn compared to those collected from canal and fish pond water habitats. Hence, it may be concluded that R. tigrina is one of the good bio-indicator species for heavy metals. It can be used to assess the heavy metal load and pollution of aquatic ecosystems. Key words: Zinc, Rana tigrina, atomic absorption spectrometry (AAS), aquatic habitat.
Highlights
Environmental scientists widely use the term "heavy metals”
It clearly demonstrates that liver tissues of R. tigrina taken from all the three habitats contain higher levels of zinc granules (Zn) than kidney samples (Table 1)
The range of total body weight of R. tigrina found in canal water, fish pond water and sewage water were
Summary
Environmental scientists widely use the term "heavy metals”. Heavy metals have specific gravities range of 4.5 to 22.5. The term heavy metal is used for elements which are toxic. Many authors (Phipps, 1981; Duffus, 2002) have critically called the term heavy metals as meaningless and objectionable. Human activities are responsible for the increment of their amount in the environment and metals pollution is increasing in water resources (Chiarelli et al, 2016). Physiology of the target species and geochemical behavior are affected due to heavy metals toxicity. The following factors are considered the most important; chemical speciation of metals in aquatic environment, presence of other metals or toxicants, environmental conditions, condition of the organisms tested, adaptation of the organism to the absorption of metals. Results showed the bioaccumulation of Ba, Zn, Pb and Mn from barytes spiked marine sediments (Ansari et al, 2004)
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