4 results about "Iodometric method" patented technology

The present application relates to a kind of double bond content testing method of inorganic powder surface chemical bonding and its application, the testing method includes the following steps: inorganic powder sample and solvent are mixed to carry out soxhlet extraction, remove the double bond of surface physical adsorption, then according to iodometric method, the double bond content testing of inorganic powder sample surface chemical bonding is obtained.The detection method provided by the present application can effectively overcome the problem of higher content measured by traditional method by introducing soxhlet extraction operation, and the method has high precision and accuracy, can provide guiding significance for the preparation, quality detection of inorganic powder and its application in resin composition.

The invention provides a padding-iodometric method for detecting the anti-yellowing performance of a clothing softener, and relates to the field of softener detection or fabric yellowing detection. The invention provides a method for detecting the anti-yellowing performance of a clothing softener, which comprises the following steps of: uniformly permeating and attaching a softener solution to the interior and the surface of cotton cloth fiber by using roller pressure through a padding method to form a stable adsorption layer; an iodophor solution is adopted and interacts with an antioxidant component in a softener solution, so that the softener can be reduced to fade; the oxidation resistance of the fabric is indirectly evaluated by quantifying the whiteness change of the fabric before and after the redox reaction of the softener and the iodophor solution; the method is simple and convenient to operate, short in detection period and visual and accurate in result, realizes sensitive and stable detection of anti-oxidation components from low concentration to high concentration, and has outstanding new creativity.

The present application provides a kind of mineral sulfide and / or sulfate content detection method and device, it is related to analytical detection technical field.The present application is determined using stage temperature combustion iodometric method, first in low temperature stage (500~700 DEG C) oxidation reaction is carried out, and the sulfide in the mineral to be detected is oxidized into sulfur dioxide;Again in high temperature stage (1150~1350 DEG C) reduction reaction is carried out, and the sulfate in the combustion residue is reduced into sulfur dioxide, and the sulfur dioxide generated in low temperature stage and high temperature stage is titrated respectively by iodometric method, and then the content of sulfide and / or sulfate in the mineral to be detected is calculated, the sulfide, sulfate and total sulfur content in the mineral to be detected can be obtained simultaneously in one detection process, and then the sulfur form distribution information in the mineral to be detected is obtained.Moreover, the method provided by the present application is simple in operation, short in time consumption, low in risk of sulfur form conversion, high in detection accuracy, and suitable for industrial detection application.

The invention relates to the technical field of chemical test methods, and particularly discloses a method for detecting oxidizing impurities in industrial anhydrous hydrogen fluoride, which comprises the following steps: S1, in a fuming cupboard, in a closed container made of a hydrofluoric acid-resistant material, mixing an original sample of industrial anhydrous hydrogen fluoride with quantitative crushed ice to obtain a diluted sample with the hydrogen fluoride mass fraction of 45-55%, calculating a dilution coefficient X; s2, accurately weighing a diluted sample with the mass of m, sequentially adding a starch indicator solution and a potassium iodide solution into a reaction vessel made of a hydrofluoric acid-resistant material, uniformly mixing, and carrying out sealed and dark standing reaction for 1-3 minutes; s3, titrating the solution obtained in the step S2 by using a sodium thiosulfate standard titration solution with the concentration of c, and recording consumption V; and S4, calculating the content of the oxidizing impurities in the industrial anhydrous hydrogen fluoride original sample according to a formula C (ppm) = [((V-V0) * c * M) / (m * X)] * 1000. The invention provides a safe and accurate detection method by combining crushed ice dilution, specific concentration window control and iodometry.