The reddish brown resinoid substance was separated out, when ×0-kg of FeCl HO was added slowly to ×0-m of % PVA basic (pH> ) aqueous solution with stirring.
The reddish brown resinoid substance was separated out, when ×0-kg of FeCl HO was added slowly to ×0-m of % PVA basic (pH> ) aqueous solution with stirring.
在不断搅拌×0~(-)m~ pH> 的％ PVA碱性水溶液中,缓慢地添加×0~(-)kgFeCl_ H_O,溶液中即析出红棕色树胶状物.