Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: A method of inhibiting corrosion of metal in contact with a corrosive medium in an oil or gas field environment, whereby a formulation containing a polyurea is introduced into the corrosive medium in contact with the metal, wherein the polyurea is formed from a polymerization reaction between a piperazine having at least two reactive amine groups and a diisocyanate. The polyurea is introduced into the corrosive medium at a concentration of 1 to 250 ppm.

Abstract: Cu(II) detection in the presence of main group heavy metal ions and d-, f- and g-element interferents relies on a colorimetric chelating complex between 3-hydroxy-5-nitrobenzaldehyde-4-hydroxybenzoylhydrazone (3-HNHBH) and Cu(II). Derivatives and entrapped forms of the probe were aligned with the methods of analysis, featuring spectrophotometric, reflectometric, lateral flow, microfluidic, lab-on-paper, positional array, dynamic array, flow cytometry and tandem stage devices. A remotely operating software capable of DFT calculations predicted the observed detection limit of 0.34 ?g L?1 (<5 nM) as well as high selectivity towards copper ions in the presence of competing Zn+2 and Ni+2. The probe was readily regenerated against metal complexation by using a 0.5 M HCl solution, indicating its feasibility to be a re-usable sensor for the convenient detection of copper ions in water-organic media.

Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: A method of inhibiting corrosion of metal in contact with a corrosive medium in an oil or gas field environment, whereby a formulation containing a polyurea is introduced into the corrosive medium in contact with the metal, wherein the polyurea is formed from a polymerization reaction between a piperazine having at least two reactive amine groups and a diisocyanate. The polyurea is introduced into the corrosive medium at a concentration of 1 to 250 ppm.

Abstract: Cu(II) detection in the presence of main group heavy metal ions and d-, f- and g-element interferents relies on a colorimetric chelating complex between 3-hydroxy-5-nitrobenzaldehyde-4-hydroxybenzoylhydrazone (3-HNHBH) and Cu(II). Derivatives and entrapped forms of the probe were aligned with the methods of analysis, featuring spectrophotometric, reflectometric, lateral flow, microfluidic, lab-on-paper, positional array, dynamic array, flow cytometry and tandem stage devices. A remotely operating software capable of DFT calculations predicted the observed detection limit of 0.34 ?g L?1 (<5 nM) as well as high selectivity towards copper ions in the presence of competing Zn+2 and Ni+2. The probe was readily regenerated against metal complexation by using a 0.5 M HCl solution, indicating its feasibility to be a re-usable sensor for the convenient detection of copper ions in water-organic media.

Abstract: Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.

Abstract: Electrodes comprising conducting graphite, paraffin oil pasting liquid, and a rare earth metal impregnated zeolite, such as lanthanum or cerium impregnated mordenite electrodes. Methods and voltammetric applications, such as square wave anodic stripping voltammetry, of these rare earth metal impregnated zeolite modified electrodes for the detection and quantification of heavy metal ions such as Pb(II) and Cd(II) in aqueous solutions.

Abstract: Electrodes comprising conducting graphite, paraffin oil pasting liquid, and a rare earth metal impregnated zeolite, such as lanthanum or cerium impregnated mordenite electrodes. Methods and voltammetric applications, such as square wave anodic stripping voltammetry, of these rare earth metal impregnated zeolite modified electrodes for the detection and quantification of heavy metal ions such as Pb(II) and Cd(II) in aqueous solutions.