Study on the Difference of Chemical Properties among Five Acacia Woods Ⅱ. Study on pH Values and Buffering Capacities

The pH values and buffering capacities for the five kinds of acacia woods(Acacia auriculaeformis,A.crassicarpa,A.cincinnata,A.mangium and A.melanoxylon) were investigated. The results were as follows: (1) there was a slight difference among the pH values of the woods, while a significant difference among the buffering capacities, the values ranged from 4.68 to 5.90;there was a significant difference in pH values between the sapwood and the heartwood of A. crassicarpa; (2) the acid buffering capacities in the woods changed between 2.70 mL and 8.35 mL, however,the base buffering capacities of the woods changed between 21.05 mL and 42.00 mL; (3) the curves of the buffering capacities in the woods were slightly different.