摘要
Accumulation trend of fluoride ion was carried out in 25 fish species, collected randomly from fresh water and marine water, Sindh, Pakistan to ensure the level of chloride contents by Selective Ion Electrode （SIE） method. Results showed an inverse relation in between chloride and fluoride concentration in muscles of fish under investigation, It was observed that chloride ions contents of marine water fish were significantly higher as compared with fresh water fish. This may be related with the habitat of marine water fish while no appreciable divergence in fluoride concentration in both regions was observed. This indicated that the deliberation of fluoride is the phenomena of nature of fish and self-determining. Highest concentration of fluoride ion in fresh water fish and marine water fish showed an inverse level of chloride ion in it, reflects water body conditions of both resources. A probable mechanism of accumulation of fluoride with respect to essential chloride ion which may be related with the size of ionic radii of both halides ion is described in relevant section of this article. Where a larger ionic radii of chloride ion believed to play an imperative role in reducing fluoridation in fishes. This may be regarded as natural chemical technology for reducing fluoride in muscle （edible part） of fish of both regions.
