在相对湿度小于临界相对湿度的条件下,在温度为60～90℃、相对湿度为60～80％范围内测定了维生素C片剂的色泽(以相对反射率R表示)变化速率,含量C变化速率及片剂溶液的色泽(以透光率T表示)变化速率。三者的表观速率常数k与热力学温度T和相对湿度RH的关系通式为k=k’exp(-E/RT)exp(mRH),k’和m为常数,E为表观活化能。不同速率常数的k’,m和E值均不同。 Under the condition of the relative humidity less than the critical relative humidity, the change rate of the color (expressed as relative reflectance R) of vitamin C tablet in the range of 60-90 ℃ and relative humidity of 60-80% Rate and color change of tablet solution (expressed as light transmittance T). The relationship between the apparent rate constant k and the thermodynamic temperature T and relative humidity RH is k = k’exp (-E / RT) exp (mRH), k ’and m are constants, and E is the apparent activation energy . The k ’, m and E values ​​for different rate constants are different.