Table 1.
Properties of selected sunscreens: Texture indicated by the brand; Sun Protection Factor (SPF); chemical UV filters used; wavelength of maximum absorbance (λmax), and percentage of absorbance measured at 303 nm regarding maximum absorbance.
Fig 1.
Sampling locations (yellow dots) at La Caleta Beach (June 28th, 2020).
Yellow dashes indicate the bathing area on the sampling day (3000 m2). Images have been created using Tableau Public Softaware.
Fig 2.
Absorption spectra of sunscreens.
Grey and blue shaded areas include the UVB and UVA ranges of wavelength, respectively. Dashed line indicates the 303 nm wavelength.
Fig 3.
Sunscreen calibration curve and equation.
Working range: 0–1500 mg L-1, number of standards 17 (measured in triplicate).
Fig 4.
Absorption spectra of sunscreens 14 and 18 at two different concentrations (50 and 100 mg/L), throughout time (from 0 hours to 50 days).
Fig 5.
Absorption spectra of samples collected June 28th, 2020, from an Atlantic beach (“beach” samples) and in a swimming pool with bathers (SP) and empty of bathers (SP-E) in both, filtered (diss) and unfiltered (total) fractions.
Dashed line indicates the 303 nm wavelength. Embedded Table shows, for each sample, the wavelength of maximum absorbance (λmax), the percentage of absorbance measured at 303 nm regarding maximum absorbance and the calculated concentrations using the external calibration curve.