Accumulation of heavy metals in the organs of wild rodents

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The aim of the present study was to observe the effects of long-term exposure of environmental pollutants during human life. For this purpose, we measured the basal levels of heavy metals in the tissue of the organs of wild rodents. Wild rodents were caught in six localities within Higashi-osaka city in the suburbs of Osaka, Japan, and the Cr, Cd and Pb content in the organs of the rodents were compared. In addition, isotope ratios of Pb were measured. No detectable Hg was measured by ICP-MS in the liver, kidney, lung, and brain of the wild rodents. When the metal contents of the organs were compared, the contents of Cr, Cd, and Pb in the kidney were higher than in the liver and brain. The lung Cr content was similar to the kidney; however, no Pb content was detected in the lungs in any rodents. Also, lung Cd content was lower than in the kidney. When metal content in the rodent organs was compared with the collection locality, only Cd content in the brain was observed as different. Next, when the 207/206 ratio of Pb was compared with the organs and collection locality, the ratios were different between the brain and kidney, and between the brain and liver. The ratio of Pb in the brain was a significant difference between No1 and No4 localities. In conclusion, metals may be absorbed into organs by different absorption routes. The spread of heavy metal environmental pollution is well reflected in the organs of wild rodents living in the suburbs of Osaka, Japan.

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