4 results about "Methyl parathion" patented technology

This invention discloses a ratiometric electrochemical sensor, its preparation method, and a method for simultaneously detecting methyl parathion and carbendazim. The sensor uses a CeCoZn-MOF / NBA / CNHs-modified glassy carbon electrode as the working electrode, a saturated KCl-type Ag / AgCl as the reference electrode, and a platinum wire as the counter electrode. Preparation involves electrode pretreatment, CeCoZn-MOF synthesis, composite material compounding, dispersion preparation, and electrode drop-coating modification. Differential pulse voltammetry is used for detection, with Nile Blue A as the internal standard probe. Quantification is based on the current ratio of the target analyte to the internal standard. The linear detection range for methyl parathion is 0.05–15 μg / mL, and for carbendazim, it is 0.05–4 μg / mL, with correlation coefficients greater than 0.99 for both. This sensor exhibits strong anti-interference capabilities, high sensitivity and accuracy, with a recovery rate of 91.0%–109.2% in actual agricultural product samples. It enables rapid, simultaneous, and accurate detection of methyl parathion and carbendazim, and is suitable for rapid on-site detection of pesticide residues in agricultural products.

The application discloses a preparation method of a cross-linked enzyme aggregate biological catalytic membrane, and mainly comprises the following steps: taking a polyacrylonitrile ultrafiltration membrane as a base film, loading polydopamine modified UiO-66-NH2 nanoparticles to the surface of the polyacrylonitrile ultrafiltration membrane as an intermediate layer, the adsorption characteristics of the intermediate layer help to enrich micro-pollutants and promote enzyme catalysis, and loading cross-linked enzyme aggregates on the treated polyacrylonitrile ultrafiltration membrane by a pressure-assisted self-assembly technology, so as to obtain the cross-linked enzyme aggregate biological catalytic membrane. The preparation method is simple in operation and easy to implement. The cross-linked enzyme aggregate technology is used to combine separation, purification and immobilization together, one-step purification and immobilization of the enzyme are realized, and the immobilization amount is increased. The cross-linked enzyme aggregate biological catalytic membrane is used for removing micro-pollutants in water, separating dyes and salt ions in wastewater or removing methyl parathion in water, and the removal rate is more than 90%, so that the cross-linked enzyme aggregate biological catalytic membrane has good effects.

The application discloses a GR@TA-Ag@MIH electrode modification material and application thereof, tannic acid (TA) is dissolved in deionized water, a Tris solution is added to adjust the pH to 7.5-8.5, and then AgNO3 is added to obtain a TA-Ag solution after stirring; graphene (GR) is dissolved in the TA-Ag solution to form a GR@TA-Ag suspension; the GR@TA-Ag suspension is added into a mixed solution containing acrylamide (AM), ammonium persulfate (APS) and methyl parathion (MP), and is stirred for 5-15 min, and after reaction, washing is performed to obtain the GR@TA-Ag@MIH electrode modification material. The graphene in the GR@TA-Ag@MIH composite material endows the sensor with excellent conductive performance, and the introduced metal ions further improve the conductive characteristics of the composite material, the sensor realizes high specificity identification of methyl parathion, and effectively avoids the interference of compounds similar in structure from generating an oxidation peak at the same potential; a TA-Ag double-catalytic system is constructed, free radicals are rapidly polymerized at room temperature, the self-adhesion of the hydrogel is utilized, and the binding force of the GR@TA-Ag@MIH and the electrode and the adsorption capacity of methyl parathion are improved.

This invention provides a biocatalytic composition for degrading soil organophosphorus residues and its preparation method, belonging to the field of soil remediation technology. The biocatalytic composition provided by this invention comprises: 20-35 parts of a compound microbial agent, 15-25 parts of an organophosphorus hydrolase, 30-45 parts of a soil amendment component, 5-10 parts of a protectant, and 2-6 parts of a synergist; the compound microbial agent is composed of *Pseudomonas aeruginosa*, *Rhizopus oligosporus*, and *Bacillus subtilis*, and the organophosphorus hydrolase is a modified immobilized organophosphorus hydrolase. In the biocatalytic composition of this invention, the compound microbial agent and the modified immobilized enzyme work synergistically to rapidly and efficiently degrade various organophosphorus residues in the soil, such as chlorpyrifos, methyl parathion, and triazophos, achieving a synergistic improvement in soil fertility and remediation effect. It is suitable for in-situ remediation of soil contaminated by organophosphorus pesticides, such as farmland, orchards, and greenhouses.