Elemental sulfur analysis in fluids
Robust methods for quantitating the amount of elemental sulfur in a fluid whereby a caustic solution is mixed with the fluid, and the elemental sulfur present in the fluid reacts to form a colored solution that can be compared to a series of standards. The methods can be performed in a laboratory or the field and allow for real time feedback. Once the concentration of the elemental sulfur is known, appropriate methods of treatment can proceed. Test kits for performing the methods in the field are also described.
1. A method of determining an amount of elemental sulfur S8 in a fluid, said method comprising adding tetrabutylammonium hydroxide 30-hydrate in an organic solvent to said fluid to obtain a colored solution; measuring absorbance of said colored solution at a wavelength between 190-750 nm; comparing said measured absorbance of said colored solution with an absorbance of a standard solutions of elemental sulfur S8 of known concentrations to determine a concentration of elemental sulfur S8 in said fluid.
2. The method of claim 1 , wherein a concentration of said tetrabutylammonium hydroxide 30-hydrate in the organic solvent is between about 0.01 and 0.1 M.
3. The method of claim 1 , wherein said organic solvent is an alcohol.
4. The method of claim 1 , wherein a volume ratio of said tetrabutylammonium hydroxide 30-hydrate in organic solvent to said fluid is 5:1.
5. The method of claim 1 , wherein 10 mL of a tetrabutylammonium hydroxide 30-hydrate solution is added to about 0.5 mL of said fluid.
6. The method of claim 1 , wherein the fluid is selected from a group consisting of gasoline, jet fuel, kerosene, condensates, black oils, solid hydrocarbons solubilized in liquid hydrocarbons, produced water, and combinations thereof.