Determination of thick-ring aromatic hydrocarbons in white oil
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Dear experts, I would like to ask: when determining polycyclic aromatic hydrocarbons in food-grade white oil, ultraviolet absorbance (260nm–420nm)/cm is used, and the values are all below 0.1. Why is ultraviolet absorbance in the range of 260nm~420nm used? Is there any explanation for this, or is it simply because the ultraviolet absorbance in this range overlaps with that of sunlight?
In this wavelength range, alkanes and cycloalkanes do not absorb energy, while monocyclic, bicyclic, and polycyclic aromatics begin to absorb energy; therefore, the wavelength is set in this area.