本工作对两种常见的商品紫外吸收剂——2-羟基-4-甲氧基二苯甲酮(UV-9)和2.4-二羟基二苯甲酮(UV-0)在基态和激发态时的离解常数进行了测定。对UV-0存在着反常的吸收强度和pH关系曲线作了合理的解释,并结合测得的离解常数对上述紫外吸收剂耗失能量的机理进行了讨论。 In this work, two common UV absorbers, 2-hydroxy-4-methoxybenzophenone (UV-9) and 2.4-dihydroxybenzophenone When the dissociation constant was measured. The relationship between the abnormal absorption intensity and pH of UV-0 is explained reasonably, and the energy loss mechanism of the UV absorber is discussed in combination with the measured dissociation constant.