B. Dix et E. Roffael, PH VALUE, BUFFER CAPACITY AND CONCENTRATI ONS OF VOLATILE ACIDS IN EXTRACTS OF LARCH CHIPS DERIVED FROM HEARTWOOD AND SAPWOOD, Holz als Roh- und Werkstoff, 52(5), 1994, pp. 324-324
Subject Investigations carried out on the pH-value and buffering capac
ity of extractives from heart- and sapwood of larch led to the followi
ng results: Heartwood extractives show a lower pH-value and higher buf
fering capacity compared to sapwood extractives. Heartwood of the 102-
year old trees show the lowest pH-value and the highest buffering capa
city. The ions of acetic and formic acid, as determined in the extract
ives by ionic chromatography, show that heartwood extractives contain
more acetate ions than sapwood extractives. Moreover, the amount of ac
etate ions in heartwood extractives increases with the age of the tree
.