Accumulation of copper in parenchyma cells in southern pine wood treated with micronized and amine-copper preservatives
IRG/WP 19-20657
D Feng, M L Turner, A Limaye, M A Knackstedt, P D Evans
Our previous research used X-ray micro-computed tomography to examine the micro-distribution of copper in southern pine wood treated with a micronized wood preservative (MCA) and an amine-copper preservative (ACQ). We found that copper in wood treated with MCA was mainly concentrated in fusiform rays (rays containing resin canals), and in vertical (axial) resin canals. A similar, although not identical distribution of copper was found in wood treated with ACQ. Hitherto we assumed that copper was located in the radial and axial resin canal voids. Our latest research shows that this is not the case. Instead, copper appears to be mainly located in parenchyma cells adjacent to resin canal voids. It is possible that these parenchyma cells are important flow paths for aqueous preservatives in southern pine, and further research, possibly using 4-D X-ray micro-CT, is needed to answer this question.