40 results about "Pentachlorobenzene" patented technology

A measurement method for the residual amount of pentachlorophenol in cigarette paper is characterized by comprising the following steps: cutting cigarette paper into pieces, adding extract liquor into the pieces, conducting ultrasonic extraction and measuring the residual amount of pentachlorophenol in the cigarette paper with liquid chromatography-tandem mass spectrometry (LC-MS / MS) directly after centrifugation of the extract liquor. The method comprises the following steps: a. cutting a cigarette paper sample according to relevant regulations; b. extracting a sample; c. purifying the sample; d. preparing a standard operating solution; e. carrying out liquid chromatography-tandem mass spectrometry (LC-MS / MS) measurement; f. calculating the measured result of the residual amount of pentachlorophenol. In comparison with the prior art, the measurement method has the following advantages: 1. adopting a pre-treatment of cutting the sample to make a solvent contact the sample better. The experiment result shows that such treatment can help to increase the extraction efficiency of pentachlorophenol. 2. measuring the content of pentachlorophenol in the paper with LC-MS / MS without derivatization operation, and the pre-treatment method is simple. 3. The method is accurate in operations, high in sensitivity and good in repeatability.

Disclosed is a wood preservative composition comprising: an ester of boric acid; pentachlorophenol (PCP); and American Wood Preservative Association's (AWPA) P9 Type A solvent. The composition is useful for reducing insect and microbial decay in wood. Further disclosed are methods of making and using such compositions.

The invention provides a phytoremediation method for soil pentachlorophenol pollution. The phytoremediation method comprises the following steps: selecting salix babylonica, conyza canadensis and alfalfa as plants; detecting the content of pentachlorophenol in the to-be-remediated soil; planting the salix babylonica in the pentachlorophenol contaminated soil; carrying out mixing sowing on conyza canadensis and alfalfa seeds among plant rows of the salix babylonica. Through the provided phytoremediation method for the soil pentachlorophenol pollution, pentachlorophenol contaminated soil can besimply and quickly remediated.

The invention discloses a synthesis method of 3,5-difluorophenol, which belongs to the technical field of chemical synthesis. 2,4,6-trifluorobenzoic acid in a solvent, under the action of alkali, obtains 3,5-difluorophenolate through one-pot reaction, and obtains 3,5-difluorophenol after adjusting the acid for free. This method has raw materials It has the advantages of cheap and easy to obtain, short synthesis steps, simple operation, mild reaction conditions, high synthesis yield, good product quality, and suitable for industrial production. 2,4,6-trifluorobenzoic acid uses cheap and easy-to-obtain pentachlorobenzonitrile as a raw material, first undergoes fluorination reaction to obtain 2,4,6-trifluoro-3,5-dichlorobenzonitrile, and then undergoes hydrolysis The reaction obtains 2,4,6-trifluoro-3,5-dichlorobenzoic acid, which is finally synthesized by selective dechlorination reaction, realizing the simple, cheap and efficient preparation of raw material 2,4,6-trifluorobenzoic acid, Improve the industrial application value of the synthesis process.

The invention provides a method for detecting pentachlorophenol content in paper packaging materials, comprising the following steps: 1) preparing a sample solution; 2) preparing a standard solution mother liquor; 3) taking different volumes of the standard solution mother liquor and adding them to In the phosphate buffer solution, standard solutions of different concentrations are prepared, and the standard curve is established after qualitative and quantitative detection using sensors based on functionalized nano-carbon materials, and then the sample solution is added to the phosphate buffer solution. After being detected by the sensor of the nanometer carbon material, the content of pentachlorophenol in the sample solution is obtained by the standard curve. The present invention further provides a sensor based on functionalized nano-carbon material and a preparation method thereof. The method for detecting the content of pentachlorophenol in paper packaging materials provided by the invention has fast response, high sensitivity, good accuracy and strong anti-interference ability, and is suitable for rapid detection of actual samples.

The invention discloses a Clostridium beijerinckii recombinant strain for high-efficiency reduction dechlorination of pentachlorophenol. After Cbei_3304 gene undergoes insertional inactivation to make the protein not normally work in NCIMB 8052. The pentachlorophenol reduction dechlorination rate of the Clostridium beijerinckii recombinant strain M-3304 in simulated wastewater containing 3.0 mg / L of pentachlorophenol, 0.15 g / L of methyl viologen (MV) and 6.44 g / L of iron citrate is 90% at 60 h, and the pentachlorophenol reduction dechlorination rate of the original strain Clostridium beijerinckii NCIMB 8052 under the same conditions is only 40%, so the pentachlorophenol reduction dechlorination rate of the Clostridium beijerinckii recombinant strain M-3304 is 2.25 times that of the original strain Clostridium beijerinckii NCIMB 8052. The Clostridium beijerinckii recombinant strain can be applied to the degradation of pentachlorophenol in water, solid garbage, solid wastes and soil, and belongs to the field of environmental protection.

The invention discloses a method for catching and detecting static headspace gas chromatography electrons of eleven chlorobenzene compounds in water, which belongs to the field of a water pollution detection technology. Eleven chlorobenzene compounds are as follows: 1, 4-dichlorobenzene, 1, 3-dichlorobenzene, 1, 2-dichlorobenzene, 1, 3, 5-trichlorobenzene, 1, 2, 4-trichlorobenzene, 1, 2, 3-trichlorobenzene, 1, 2, 3, 4, 5-tetrachlorobenzene, 1, 2, 4, 5-tetrachlorobenzene, pentachlorobenzene and hexachlorobenzene. According to the method, a water sample containing 20% of sodium chloride is added into a 20mL of headspace bottle, an aluminium cover containing PTFE (polytetrafluoroethylene) is utilized to seal instantly, and 800 [mu] L of gas in a top space of the headspace bottle is taken to detect in a gaschromatograph after the headspace bottle added with the water sample is balanced with the vibrating speed of 500rpm for 30 min at 70 DEG C. A detection limit of the eleven chlorobenzene compounds is 0.0002-0.04 [mu] g / L, and the recovery rate is 83-116%. The method provided by the invention is environmentally friendly, free of organic solvent, simple to operate, wide in linear range, good in repeatability, high in recovery rate and is capable of quickly detecting the concentration of the chlorobenzene compounds in water.

The disclosure provides a synthesis method of 2,4,6-trifluorobenzylamine, belonging to the technical field of chemical synthesis. The synthesis method is characterized by comprising the following steps: (1) allowing pentachlorobenzonitrile as a raw material to undergo fluoridation reaction with a fluoridation agent based on 2,4,6-trifluoro-3,5-dichlorobenzonitrile as a solvent to obtain 2,4,6-trifluoro-3,5-dichlorobenzonitrile; (2) hydrogenating the obtained 2,4,6-trifluoro-3,5-dichlorobenzonitrile with hydrogen in the presence of organic carboxylic acid, based, on palladium carbon as a catalyst to obtain 2,4,6-trifluoro-3,5-dichlorobenzylamine; and (3) hydrogenating the obtained 2,4,6-trifluoro-3,5-dichlorobenzylamine with hydrogen in a solvent in the presence of a catalyst to obtain 2,4,6-trifluorobenzylamine. The synthesis method has the advantages of low raw material cost, short reaction steps, high reaction yield, good product purity simple operation and the like, and is suitable for industrial production.

The invention discloses a MnO-based 2 The invention discloses a method for detecting pentachlorophenol in wood products by nanorods, belonging to the field of analysis and detection. This method first prepares MnO 2 nanomaterials, followed by the preparation of MnO 2 Nanorod dispersion modified screen-printed electrodes by differential pulse voltammetry using MnO 2 The screen-printed electrode modified by the nanorod dispersion was used to detect the Tris-HCl buffer solution containing different concentrations of pentachlorophenol, and the relationship between the oxidation peak current of pentachlorophenol and the concentration was obtained; Standard recovery test, the content in the sample to be tested can be measured. The electrochemical detection method established by the invention has high sensitivity, safety, simple operation and low requirements for operators, and can be used for rapid detection of pentachlorophenol in wood products.