A streamlined workflow to study direct photodegradation kinetic and transformation products for persistence assessment of a fragrance ingredient in natural waters

Abstract

A streamlined workflow was developed to generate relevant, reliable and transparent data on direct photodegradation kinetic and transformation products for environmental persistence assessment of fragrance chemicals for regulatory compliance.

Determining wavelength-dependent quantum yields of photodegradation: importance of experimental setup and reference values for actinometers

“…This higher apparent F UVB was attributed to greater effective transmitted irradiance due to light reection within the photoreactor and transparent sample container, which has been previously reported in the literature. [47][48][49]61 This light refelction cannot be captured by the spectroradiometer that measures only downwelling irradiance. Light reection increases the average pathlength of photons and therefore the number of photons available for photolysis in optically transparent chemical solutions, resulting in an articially higher apparent F. 49,62 The predominant source of light reection was from the reective surfaces of the photoreactor (Table 1).…”

Linking Triclosan’s Structural Features to Its Environmental Fate and Photoproducts

“…To calculate the half-lives at discrete depths, I 0λ in eq was multiplied by the light transmittance at a given depth and wavelength. Transmittance was calculated for every 1 cm increment in depth using , where K d , the diffuse attenuation coefficient, was calculated with the relationship from Morris et al as previously described using a dissolved organic carbon concentration of 5 mg C L –1 . , To calculate half-lives over varying mixed depth values, I 0λ in eq was multiplied by the screening factor calculated using eq …”

“…, where K d , the diffuse attenuation coefficient, was calculated with the relationship from Morris et al as previously described using a dissolved organic carbon concentration of 5 mg C L −1 . 36,37 To calculate half-lives over varying mixed depth values, I 0λ in eq 2 was multiplied by the screening factor λ S ( )…”