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How long does it take for copper gutters to Patina? 

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Nevertheless over the long term, a fraction of the copper bound to the sediment could be released depending on the organic matter mineralization which could explain the presence of copper in the water column one year after the last copper addition.
Extremes in patina growths manifested as color variations are shown to result from variations in grain structure brought about by different heat treatment prior to exposure of the copper to the elements.
It is suggested that at marginal copper, copper retention by senesced vegetation limits the retranslocation of copper from vegetation to grain.
The results revealed that copper patina composition is strongly influenced by chloride pollution and specific zone conditions.
Monitoring plasma tracer kinetics showed potential for estimation of copper absorption without the need for fecal copper analysis.
It is not obvious from the present data how the growth response can help alleviate copper limitation in the field.
Open accessJournal ArticleDOI
M. K. Nicholls, T. McNeilly 
01 Nov 1979-New Phytologist
34 Citations
It is suggested that rooting sensitivity to a range of copper concentrations provides a further measure of copper tolerance which is independent of the methods previously employed for assessing tolerance.
Each of these responses appears to be useful for predicting the concentration range of copper likely to have no long-term effects on the species.

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