Deep UV Fluorescence allows for the measurement of light hydrocarbons and condensates
For the measurement of hydrocarbons in water LIF laser induced fluorescence is the normal go to method. While laser induced fluorescence can measure crude and heavier oils with significant accuracy, lighter more refined oils will have limited success.
The reason for this, is that lighter oils which are often found in refinery or industrial production contain aromatic hydrocarbons of less complex structures (such as single ring hydrocarbons). The fluorescence wavelength required to excite these hydrocarbons requires a much lower wavelength light than that of Laser Induced Fluorescence which is usually 405nm.