3 results about "Partition coefficient" patented technology

Predict the retention time of the target substance obtained by high-performance liquid chromatography. [Solution] In the retention time prediction method, a parametric function is created using a linear combination of the partition coefficients between the mobile phase and multiple stationary phase models. For multiple standard substances, the partition coefficients between the mobile phase and multiple stationary phase models are calculated by quantum chemical calculations using molecular structure information. Using the retention times and partition coefficients of the multiple standard substances, the parameters of the partition coefficients in the linear combination of the parametric function are determined by linear regression. A specific function is created by substituting the parameters into the parametric function. For the target substance, the partition coefficients between the mobile phase and multiple stationary phase models are calculated by quantum chemical calculations using molecular structure information. Using the specific function, the retention time is calculated from the partition coefficients for the target substance.

This invention discloses a special polyferric sulfate suitable for low-temperature, low-turbidity water treatment and its preparation method. The product has a basicity B = 12%–15%, an average degree of polymerization n = 12–15, a Zeta potential ≥ +30mV at 5°C, and contains 0.01–0.05wt% (as Fe₂O₃) of La. 3+ or Ce 3+ A copolymer stabilizer, intercalated between Fe–O–Fe chain segments, was confirmed by XRD to have a lattice distortion rate Δd / d = 0.8%. This material exhibits an adsorption capacity for orthophosphate ≥ 48 mg P / g and a partition coefficient K ≥ 2.4 × 10⁻⁶ for microcystin-LR. 4 L / kg, under conditions of 5–10℃, turbidity 1–5 NTU, pH 6.5–7.2, and a dosage ≤12 mg / L, can achieve a turbidity removal rate ≥90% and UV removal. 254 The removal rate is ≥65%, the TOC removal rate is ≥58%, and the phosphorus removal capacity retention rate is ≥88% after 30 freeze-thaw cycles. The preparation method employs a gradient oxidation process: 25% dilute sulfuric acid (mass fraction), ferrous sulfate to dilute sulfuric acid mass ratio 8.5–9.5:1; 10% sodium nitrite is added dropwise at a uniform rate (0.022–0.033 mg / L). 3 ( / min), the mutation point determination criteria are brownish-red color + divalent iron ≤0.1g / L; filter pore size ≤0.2μm, cooled to 25–35℃ and then stored in a sealed environment at 3–5℃. This invention solves the problems of low activity, poor stability and weak removal of multiple pollutants in low-temperature and low-turbidity scenarios such as cold lakes and black and odorous river sediments, and provides a safe, long-lasting and controllable new functional material for ecological restoration.

The present application relates to the technical field of geochemical quality migration calculation, in particular to a method for calculating the quality migration of geological evolution, and mainly comprises the following characteristics: an initial material-product geological evolution conceptual box model is established, the mass concentration of each element in different subsystems is determined, the system evolution degree epsilon is calculated to measure the degree of system mass change, the element activity ability is measured by calculating the partition coefficient D i , and finally the quality migration is calculated by using a formula to objectively reflect the mass change process of the element; compared with the prior art, the present application does not need to assume inactive elements, avoids subjective bias, can effectively overcome the influence of the closed effect, and provides more reliable calculation results of the element quality migration; the method is widely applicable to the field of geological research, and has significant application value in aspects of structural background discrimination, magmatic rock classification, and sediment source area analysis.