Journal: ACS Omega

Article Title: Derived UV–Vis Absorbance Spectra for Facile Analysis of Optically Dense Samples

doi: 10.1021/acsomega.5c08711

Figure Lengend Snippet: UV–vis absorbance spectra and the corresponding derived absorbance ( A D ) spectral profiles are presented for five different sample types: (a) E oil and its aged samples, (b) diesel–biodiesel mixtures, (c) olive oil and olive–pomace oil mixtures, (d) urine samples, and (e) humic acid (HA) samples in distilled water. In a particular graph, the top panel displays the raw UV–vis absorbance spectra, while the bottom panel shows the corresponding derived absorbance spectra. The legends are consistent across both panels for each sample type. In graph (a), E oil and its aged samples are labeled with “D” to indicate the number of aging days (e.g., D25 indicates the spectrum after 25 days of aging). In graph (b), “90% diesel” denotes a mixture of 90% diesel and 10% biodiesel (v/v), and so on. In graph (c), “90% olive oil” represents a mixture of 90% olive oil and 10% olive–pomace oil (v/v). In graph (d), “90% urine” refers to a mixture of 90% urine and 10% double-distilled water (v/v). In (e), “HA” refers to humic acid.

Article Snippet: Biodiesel was sourced from a commercial supplier in Chennai; the biodiesel sample was prepared through the transesterification of Jatropha curcas L. oil.

Techniques: Derivative Assay, Labeling