A method of treating a fluid to reduce the level of H.sub.2S therein while inhibiting the deposition of scale on surfaces in contact with the fluid, comprising introducing into the fluid a triazine scavenger compound and a terpolymer. The fluid may be liquid or gas and may be petroleum, petroleum product, natural gas, liquefied petroleum gas or other type of oil fraction or refined oil. The triazine scavenger may be e.g. 1,3,5-tri(2-hydroxyethyl)-hexahydro-1,3,5-triazine.

The terpolymer may comprise a carboxylate/sulphonate/non-ionic terpolymer. When added to a wellbore fluid, it is effective as a scavenger of H.sub.2S and also reduces the amount of scale deposition on a surface in contact with the fluid when the fluid comes into contact with or is mixed with a brine. In some aspects, the composition increases the proportion of precipitated solids held in suspension when the fluid is contacted with or mixed with a brine.

A method of inhibiting carbonate scale in an industrial water system includes the steps of dosing the industrial water system with a water treatment polymer comprising at least 60 mol % of carboxylic acid monomer and a quaternized naphthalimide fluorescent monomer as disclosed herein, and then monitoring the fluorescence of the water system. If both maleic acid and phosphino moieties are included in the water treatment polymer, then the maleic acid is present as no greater than 70 mol % of the water treatment polymer. If the polymer contains a sulfonic acid monomer, the polymer is a fluorescence efficient polymer.

A method of inhibiting carbonate scale in an industrial water system includes the steps of dosing the industrial water system with a water treatment polymer comprising at least 60 mol % of carboxylic acid monomer and a quaternized naphthalimide fluorescent monomer as disclosed herein, and then monitoring the fluorescence of the water system. If both maleic acid and phosphino moieties are included in the water treatment polymer, then the maleic acid is present as no greater than 70 mol % of the water treatment polymer. If the polymer contains a sulfonic acid monomer, the polymer is a fluorescence efficient polymer.

Per- and polyfluoroalkyl substances (PFAS) are destroyed by oxidation in supercritical conditions. PFAS in water is concentrated in a reverse osmosis step and salt from the resulting solution is removed in supercritical conditions prior to destruction of PFAS in supercritical conditions.

A composition in the form of a tablet for neutralizing toilet odor and preventing bacterial growth comprising proteolytic enzymes (protease) and a complex of sodium bicarbonate, citric acid, and a surfactant for foaming, as well as EDTA disodium (Trilon B), sodium percarbonate, dye, and fragrance.

Disclosed here are the methods of using one or more multiple charged cationic compounds in a corrosion control composition to reduce corrosion of metal surfaces in a water system. The multiple charged cationic compounds are derived from polyamines through a ring-opening reaction with an epoxide or two reactions: an aza-Michael addition with an activated olefin having a cation group and a ring-opening reaction with an epoxide. The disclosed methods or compositions are found to be effective than those methods or compositions including commonly used corrosion inhibitors for water systems.

Disclosed here are the methods of using one or more multiple charged cationic compounds in a corrosion control composition to reduce corrosion of metal surfaces in a water system. The multiple charged cationic compounds are derived from polyamines through a ring-opening reaction with an epoxide or two reactions: an aza-Michael addition with an activated olefin having a cation group and a ring-opening reaction with an epoxide. The disclosed methods or compositions are found to be effective than those methods or compositions including commonly used corrosion inhibitors for water systems.

Compositions and methods for removing scales within a subterranean environment are provided. The method includes placing a treatment fluid into the subterranean environment containing oil-laden scales and dissolving the oil-laden scales by contacting the treatment fluid to the oil-laden scales. The treatment fluid contains a solvent mixture containing a pyrrolidone and a terpene, an emulsifier, and a chelate mixture containing hydrochloric acid and a chelating agent that contains methylglycine diacetate.

Compositions and methods for removing scales within a subterranean environment are provided. The method includes placing a treatment fluid into the subterranean environment containing oil-laden scales and dissolving the oil-laden scales by contacting the treatment fluid to the oil-laden scales. The treatment fluid contains a solvent mixture containing a pyrrolidone and a terpene, an emulsifier, and a chelate mixture containing hydrochloric acid and a chelating agent that contains methylglycine diacetate.

A method and system for testing a liquid sample for an organic compound is disclosed, the method including the steps of collecting the liquid sample from a liquid source; transmitting light having a wavelength of between about 190 nanometers and about 310 nanometers into the liquid sample; measuring absorption/transmission of the light by the organic compound in the liquid sample; and determining a concentration of the organic compound within the liquid sample based on the absorption/transmission of the light by the organic compound. The system can include a spectrophotometer for measuring the absorption of UV light by the organic compound, an ion exchange column for removing ion contaminants from the liquid sample, and a vacuum degasser unit for removing gases and other impurities from the liquid sample.