15 results about "Dichlorvos" patented technology

The invention discloses a compound herbicide, which comprises the following effective active components: halauxifen-methyl, florasulam and dichloro clomazone in a mass ratio of (1-2): (1-2): (20-40). According to the compound herbicide, through the synergistic effect of the three active ingredients, the weeding spectrum is remarkably expanded, broadleaf weeds and grassy weeds in a wheat field can be effectively prevented and removed, and compared with a single agent or a binary compound agent, the dosage of the effective ingredients can be reduced, pesticide residues and environmental risks can be reduced, meanwhile, generation of drug resistance of the weeds is delayed, and the weed resistance is reduced. The green weeding requirement of modern agriculture is met.

The invention discloses a killing composition for averrhoa carambola anoplophora chinensis, and belongs to the technical field of agricultural insect pest killing. The killing composition comprises the following effective components: dichlorvos, cypermethrin and thiotraniliprole, and the concentration of each effective component is as follows: the concentration of the dichlorvos is 0.1-2.5 g / L; the concentration of the cypermethrin is 0.005 to 0.1 g / L; the concentration of the thiotraniliprole is 0.1 g / L to 2 g / L. When the pesticide is used for killing carambola anoplophora chinensis larvae, the concentrations of the effective components are as follows: the concentration of dichlorvos is 1g / L; the concentration of the cypermethrin is 0.04 g / L; the concentration of the thiotraniliprole is 0.8 g / L; when the pesticide is used for killing adult averrhoa carambola anoplophora chinensis, the concentrations of the effective components are as follows: the concentration of dichlorvos is 0.5 g / L; the concentration of the cypermethrin is 0.04 g / L; the concentration of the thiotraniliprole is 0.4 g / L. The composition disclosed by the invention consists of dichlorvos, cypermethrin and thiotraniliprole, and has a relatively good effect on killing larvae and adults of averrhoa carambola anoplophora.

The invention aims to overcome the defects in the prior art and provides a refined trichlorfon powder (for aquatic products) preparation. The pesticide is prepared from the following raw and auxiliary materials in percentage by weight: 20-80% of refined trichlorfon, 5-60% of white carbon black, 0.01-2% of a pH indicator, 0.1-2% of a surfactant, 10-40% of beta-cyclodextrin and the balance of anhydrous sodium sulfate. According to the refined trichlorfon powder (for aquatic products), the problem that the refined trichlorfon powder is low in melting point is remarkably solved; the pH indicator can effectively prompt the danger that the toxicity is increased when the trichlorfon is converted into the dichlorvos through the obvious change of the color of the liquid medicine.

The invention discloses a method for rapidly detecting dichlorvos on site based on scattering turbidity, and belongs to the technical field of food and agricultural product safety detection. The method comprises the following steps: incubating dichlorvos with different concentrations with candida antarctica lipase, a phosphate buffer solution and L-ascorbyl palmitate, centrifugally incubating to obtain a reaction solution, taking a supernatant to react with a manganese dioxide nanosheet, measuring the turbidity of the reaction solution through a portable turbidimeter, and establishing a linear equation of the concentration and the turbidity of the dichlorvos; by measuring the turbidity of an unknown sample, the concentration of the dichlorvos can be calculated according to a linear equation. According to the method, invisible dichlorvos concentration signals are converted into measurable turbidity signals by utilizing the synergistic effect of enzyme inhibition reaction and turbidity change induction of the nano material, so that rapid and sensitive detection of dichlorvos is realized. The method is easy and convenient to operate, low in cost, high in detection speed, free of large instruments and especially suitable for on-site rapid screening of agricultural products.

The invention relates to the field of biodegradation, in particular to a pesticide residue degradation composite enzyme based on delftia and a preparation method and equipment thereof.The pesticide residue degradation composite enzyme comprises a smashing cylinder, the bottom of the smashing cylinder penetrates through and is fixedly connected with a feeding cylinder, the bottom of the feeding cylinder is connected with a screening assembly, and supporting blocks are fixedly connected to the four corners of the bottom of the smashing cylinder; a first motor is fixedly connected to the top of the smashing barrel, the output end of the first motor penetrates through the smashing barrel to be fixedly connected with a smashing rod, smashing blades are fixedly connected to the outer portion of the smashing rod, a constant-temperature shaking table is arranged on the right side of the smashing barrel, and a fermentation tank is arranged on the right side of the constant-temperature shaking table; the top of the fermentation tank is fixedly connected with a second motor. The degradation rates of the enzyme for organophosphorus pesticides such as phoxim, dichlorvos and dimethoate with the concentration of 200 mg / L within 48 hours reach 93.8%, 92.5% and 91.2% respectively and are far higher than those of mainstream biodegradable products (72%-80%) in the market, and the degradation period is only 5 days and is shortened by 83% compared with that of a traditional enzyme.

The invention relates to the technical field of pesticides, and discloses a pyriproxyfen-containing soluble concentrate and a preparation method thereof. The pyriproxyfen-containing soluble concentrate provided by the invention is prepared from the following components in parts by weight: 1 to 10 parts of pyriproxyfen active compound, 70 to 80 parts of dichlorvos active compound, 10 to 20 parts of emulsifier and 1 to 5 parts of stabilizer. According to the pyriproxyfen-containing soluble concentrate provided by the invention, the nerve poison dichlorvos and the insect growth regulator pyriproxyfen are combined to form a prevention and control system covering the whole life cycle of pests, and the emulsifier and the stabilizer are matched, so that the soluble concentrate has relatively good content stability under the conditions of normal temperature and heat storage, and the decomposition rate of effective components is reduced.

This invention relates to a dual-response fluorescent probe, its preparation method, and its application in the detection of dichlorvos and tin ions. The fluorescent probe is synthesized via a Schiff base condensation reaction using rhodamine B hydrazide intermediate and 3-methoxy-5-bromosalicylic acid aldehyde as raw materials. The probe specifically recognizes dichlorvos (DDV) and tin ions in a DMSO / H₂O (v:v=3:7) system. Under 350 nm excitation, the fluorescence is significantly enhanced at 590 nm, and the solution color changes from colorless to pink (DDV) or orange-red (tin ions), respectively. The probe has a low detection limit (DDV: 1.912 × 10⁻⁶). ‑8 M, Sn 4+ 3.623×10 ‑7 M), fast response (DDV: 4 min, Sn) 4+ Advantages include short response time (5 min), strong anti-interference ability, and wide pH range (2-12). Mechanistic studies show that the probe binds to DDV in a 1:1 ratio via hydrogen bonds and to Sn. 4+ A six-membered ring chelate is formed through oxygen / nitrogen atom coordination at a 2:1 ratio. Based on this probe, a portable paper-based fluorescent sensor was successfully used to detect dichlorvos in actual fruit and vegetable samples such as cucumbers, grapes, and tomatoes, as well as Sn in actual water samples such as Yellow River water and tap water. 4+ Visual detection and spiked recovery experiments were conducted; dichlorvos and Sn were successfully detected in live zebrafish. 4+ The invention utilizes fluorescence imaging and, combined with a smartphone, establishes a visual quantitative detection fluorescence sensing platform, enabling on-site quantitative detection. This invention provides a new technical means for the rapid, sensitive, and visual on-site detection of dichlorvos and tin ion residues in environmental and biological systems.

The present invention relates to the technical field of pesticides, and in particular to an insecticidal composition containing isoflualanam and a use thereof. The insecticidal composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is isoflualanam; and the active ingredient B is selected from one or more of the following compounds: phoxim, chlorpyrifos, triazophos, quinalphos, carbosulfan, diazinon, dichlorvos, and trichlorfon. The composition has the characteristics of reasonable formulation, good insecticidal efficacy, low application cost, reduced application amount, safety to crops, reduced pesticide residues and the like.

The invention discloses a method for detecting dichlorvos in ham in the technical field of meat product pesticide residue detection. The method comprises the following steps: extracting a ham sample by using an organic solvent, and selectively enriching dichlorvos in an extracting solution by using a porous zinc oxide-molybdenum disulfide-graphene quantum dot heterojunction nano composite material; then directly dispersing and modifying the composite material loaded with the dichlorvos on the surface of a glassy carbon electrode to form a sensitive interface, finally detecting by adopting a square wave voltammetry, and quantifying by adopting an external standard method. According to the method, the selective enrichment function of a nano material and the construction of an electrochemical sensing interface are combined into a whole, the complex elution and transfer steps in traditional detection are simplified, the utilization rate and the detection sensitivity of a target object are effectively improved, and the method has good anti-interference capability on complex matrix interference of hams and is suitable for being used in detection of hams. The rapid and high-sensitivity detection of the dichlorvos residue is realized.

The invention belongs to the technical field of pesticides, and particularly relates to an insecticidal composition containing oxazosulfuron and application of the insecticidal composition. The insecticidal composition comprises an active component A and an active component B. The active component A is oxazosulfuron; and the active ingredient B is selected from one or more of the following compounds: phoxim, chlorpyrifos, triazophos, quinalphos, carbosulfan, diazinon, dichlorvos and dipterex. The composition is reasonable in component, good in insecticidal effect and low in pesticide cost, and has the characteristics that the application amount is reduced, the composition is safe to crops, the pesticide residue is reduced and the like.

The invention provides a nano-enzyme synthesis method which comprises the following specific steps: sequentially heating, drying and grinding an aqueous solution containing 0-generation polyamide-amine dendritic macromolecules, potassium ferricyanide and urea, carrying out high-temperature pyrolysis twice, and grinding again to obtain the target nano-enzyme. The invention also provides a corresponding dichlorvos detection method, which comprises the following operation steps: mixing a sample solution, a buffer solution and a nano-enzyme solution for incubation, and then adding the mixed solution into a borate buffer solution containing hydrogen peroxide for reaction; and after the reaction is finished, sequentially adding a potassium iodide solution and a rhodamine 6G solution, and carrying out fluorescence detection after the reaction is finished. The nano-enzyme synthesized by the method has multiple enzymatic characteristics of oxidase-like, peroxidase-like, catalase-like and superoxide dismutase-like, has the advantages of excellent selectivity and high sensitivity in detection of dichlorvos, and is suitable for rapid detection of dichlorvos in actual samples.

This invention discloses a method for reducing lead loss in rare earth concentrates. The method includes the following steps: preparing a solution of dichlorvos at a certain concentration and adjusting its pH to 1-9 using hydrochloric acid; adding the dichlorvos solution to the lead-containing rare earth concentrate under specific temperature and acidity conditions, stirring thoroughly to react and selectively form lead complex precipitates; after the lead removal reaction, if the dichlorvos content in the concentrate exceeds the standard, adding magnesium chloride to remove the excess dichlorvos; and separating the solid and liquid phases to obtain a low-lead rare earth solution and lead slag, and analyzing their composition. Compared to the traditional sodium sulfide lead removal process using rare earth solutions, this invention avoids the precipitation loss of rare earth hydroxide and the generation of toxic hydrogen sulfide gas, and has the advantages of simple operation, low cost, and environmental friendliness, making it highly promising for industry promotion.

The invention belongs to the field of pesticide synthesis, and particularly relates to a synthesis process and a synthesis system of dichlorvos. The dichlorvos synthesis system provided by the invention comprises a mixer, a synthesis kettle, an inner coil cooler, a condenser, a demister, a purification kettle and a washing tower, wherein silk screen holes with the aperture of 0.5-5 microns are formed in the demister; the synthesis method comprises the following steps: adding trimethyl phosphite and trichloroacetaldehyde into a synthesis kettle through a mixer, reacting at the temperature of 60-90 DEG C and the pressure of-10-0kPa, and condensing, demisting and recovering chloromethane; reaction liquid enters a purification kettle and is vaporized and purified at the temperature of 75-95 DEG C and the pressure smaller than or equal to-80 kPa, and gas-phase dichlorvos is collected after being subjected to reflux impurity removal, secondary condensation and demisting through a washing tower. The dichlorvos crude oil with the content larger than or equal to 99% can be prepared, the raw material conversion rate is larger than or equal to 99.5%, the method is suitable for large-scale production, and economical efficiency and stability are both considered.

The invention relates to a formula and a preparation method of fruit and vegetable washing salt with an effervescing function. The fruit and vegetable washing salt comprises sodium chloride, sodium bicarbonate and citric acid coated with a film. The fruit and vegetable salt tablet has the advantages that the formula adopts food-grade raw materials, the use is safe, the washing process is simple, the dichlorvos removal effect is good, and the fruit and vegetable salt tablet is convenient to use.

The invention provides a method for detecting organophosphorus in soil, and relates to the technical field of environment monitoring and analysis detection. According to the method, through four core steps of sample pretreatment, targeted extraction, purification separation and accurate detection, a specific extractant-dispersant combination is adopted to reinforce organic phosphorus selective enrichment, ultrasonic assistance is combined to shorten the extraction time, and an HPLC-MS / MS multi-reaction monitoring mode is utilized to realize anti-interference quantification. The core innovation lies in extraction system optimization, accurate matching of pretreatment parameters and targeted design of a detection mode. Practice verification shows that the detection limit of the method on 15 common organophosphorus such as dimethoate and dichlorvos in soil is as low as 0.01-0.05 mu g / kg, the recovery rate reaches 90%-105%, the relative standard deviation RSD is smaller than or equal to 3.5%, the pretreatment time is shortened to be within 30 min, and the method is suitable for organophosphorus residue detection of various soil samples such as farmlands, industrial areas and polluted sites and has a wide application prospect. And scientific and accurate data support is provided for soil environment quality evaluation.