Procedure for measuring contents of hydrocarbons in liquids containing such

• US 4,707,603 A
• Filed: 01/27/1986
• Issued: 11/17/1987
• Est. Priority Date: 03/23/1984
• Status: Expired due to Fees

• Current Assignee: Sahkoliikkeiden OY Sahkometsa 01310 Vantaa Finland
• Original Assignee: Sahkoliikkeiden OY
• Inventors: Miemela, Pentti, Jaatinen, Jarl
• Primary Examiner(s): FIELDS, CAROLYN
• Application Number:
  US06/817,749
• Time in Patent Office: 659 Days
• Field of Search: 250/301, 250/343, 250/339, 250/345, 250/346, 356/70
• US Class Current: 250/339.08
• CPC Class Codes: G01N 2015/0668 Comparing properties of sample and carrier fluid, e.g. oil in water
• CPC Class Codes: G01N 21/3577 for analysing liquids, e.g. polluted water
• CPC Class Codes: G01N 33/18 Water

Abstract

The present invention concerns a procedure for measuring the contents of hydrocarbons in liquids containing such. The liquid to be measured is conducted to a transparent measuring cuvette or equivalent and the measuring cuvette is irradiated with infrared radiation from a radiation source, and the hydrocarbon content present in the liquid is determined on the basis of the difference in absorption between the liquid together with the hydrocarbon in it and the liquid itself. In the procedure is measured the infrared absorption spectrum of the liquid containing hydrocarbons in a preselected, comparatively wide wavelength range (λ_beginning,λ_end) having a width exceeding that on which the absorption of the hydrocarbon being examined has an effect. The proper absorption of the liquid in the hydrocarbon'"'"'s absorption range is determined by calculation with the aid of a spectral part outside said range, whereby the absorption of the hydrocarbon contained in the liquid is obtained on the basis of the difference between said absorptions.

Claims