Über die Eignung von Phosphatase‐ und Esteraseaktivitätsbestimmungen an Fichtennadeln und Birkenblättern zum Nachweis „unsichtbarer physiologischer” Fluorimmissionsschädigungen

Measurement of phosphatase and esterase activity in Norway spruce needles and birch leaves to detect “hidden” F‐injury . Potted Norway spruce and birch were exposed at various distances from an industrial fluoride source. The needles and leaves were analysed periodically during a year for their enzymatic activities. In contrast to phosphatase, increased esterase activities were found to be a possible indicator of “hidden” F‐injury to the trees.