Quantification of Unimolecular Photoreaction Kinetics: Determination of Quantum Yields and Development of Actinometers—The Photodegradation Case of Cardiovascular Drug Nisoldipine

Table 4

Correlation equations for the variation of NIS photodegradation overall rate-constants and initial reaction velocities () with radiant power (), the corresponding and factors, and the span of radiant power employed for various monochromatic irradiations.

Irradiation wavelength /nm	Equation of the line^a	Correlation coefficient,	/einst·s^−1·dm^−3
390	7902.7  ×    −  5 × 10^−6	0.996	3.81–10.9
370	8850.8  ×    +  5 × 10^−7	0.999	5.55–11.9
345	8391.1  ×    −  7 × 10^−6	0.998	2.42–7.20
320	7558.4  ×    +  2 × 10^−5	0.996	1.34–4.35
390	−97.98  ×    −  5 × 10^−6	0.944	3.81–10.9
370	−226.05  ×    +  7 × 10^−5	0.956	5.55–11.9
345	−124  ×    −  1 × 10^−5	0.984	2.42–7.20
320	−130.26  ×    −  4 × 10^−6	0.996	1.34–4.35

, , and intercepts expressed in s⁻¹; and in einst⁻¹·dm³.