Elemental concentrations of aquatic insect larvae and attached algae in an uncontaminated river were analyzed by instrumental neutron activation analysis (INAA) via the k0-standardization method. The aquatic insect larvae found were all intolerant species. No significant difference was observed in the elemental concentrations of aquatic insect larvae and attached algae along the river. Similar elemental concentrations were observed in the aquatic insect larvae collected at a fixed sampling point for two years. An analysis by the ratio-matching technique indicated a higher generic relationship between aquatic insect larvae and attached algae than river water.
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