Abstract: A system and method for monitoring and treating petroleum in a storage tank is provided. The system and method comprise including a plurality of vertically spaced sensors inside the tank, the plurality of vertically spaced sensors being in communication with a computer. The computer is able to calculate the quantity and quality of the petroleum in the tank based off the readings from the plurality of vertically spaced sensors. As a result, the petroleum in the tank can be optionally treated prior to sale in order to optimize the price received for the petroleum in the tank.

Abstract: Concentration of a solute in a solution is determined. Light from a light source is received at a chamber containing the solute and the solution. The light is transmitted along an optical path length of the chamber, through the solute and the solution, and output from the chamber. The light output from the chamber is detected by a detector. The optical path length of the chamber is selected to optimize sensitivity of the detector. The concentration of the solute in the solution is determined based on the light received by the detector.

Abstract: Concentration of a solute in a solution is determined. Light from a light source is received at a chamber containing the solute and the solution. The light is transmitted along an optical path length of the chamber, through the solute and the solution, and output from the chamber. The light output from the chamber is detected by a detector. The optical path length of the chamber is selected to optimize sensitivity of the detector. The concentration of the solute in the solution is determined based on the light received by the detector.