Chinese parasol bacteristatic and its processing method

High-strength anti-scouring cofferdam for bridge

The utility model discloses a high-strength anti-scouring cofferdam for a bridge. The cofferdam comprises positioning piles, end cofferdam plates, side cofferdam plates and a water pumping device, thetwo ends of the positioning pile are each provided with an opening. The end cofferdam plate comprises an L-shaped steel plate and an inserting folded edge, and when the end cofferdam plate is used, the inserting folded edge is inserted into the openings in one ends of the two positioning piles; two ends of the side cofferdam plate are respectively inserted into the other openings of the two positioning piles; after the side cofferdam plates and the end cofferdam plates are inserted into the openings of the positioning piles respectively, the interiors of the positioning piles are filled withsealing filler, and cofferdam sealing and fixing are achieved; and finally, accumulated water in the cofferdam is pumped out through the water pumping device. And the sharp-angled end cofferdam plateis adopted ...

Method for determining content of formaldehyde in water-based adhesive for cigarettes

The invention belongs to the technical field of tobacco, and particularly discloses a method for determining the content of formaldehyde in a water-based adhesive for cigarettes. The method comprises the steps of: diluting a sample of the water-based adhesive for the cigarettes and extracting the formaldehyde in the sample of the water-based adhesive for the cigarettes by water; derivatizing 2,4-dinitrophenylhydrazine; using acetonitrile for volume fixation; obtaining formaldehyde-2,4-dinitrophenylhydrazone sample solution; equipping a diode array detector with a high performance liquid chromatograph; and quantificationally determining the content of the formaldehyde in the sample of the water-based adhesive for the cigarettes by an external reference method, wherein chromatographic conditions are that: a C18 chromatographic column is taken as a stationary phase, water and the acetonitrile are taken as a mobile phase, and the mobile phase comprises the components in percentage by volume ...

Method for determining content of formaldehyde in water-based adhesive for cigarettes

The invention belongs to the technical field of tobacco, and particularly discloses a method for determining the content of formaldehyde in a water-based adhesive for cigarettes. The method comprises the steps of: diluting a sample of the water-based adhesive for the cigarettes and extracting the formaldehyde in the sample of the water-based adhesive for the cigarettes by water; derivatizing 2,4-dinitrophenylhydrazine; using acetonitrile for volume fixation; obtaining formaldehyde-2,4-dinitrophenylhydrazone sample solution; equipping a diode array detector with a high performance liquid chromatograph; and quantificationally determining the content of the formaldehyde in the sample of the water-based adhesive for the cigarettes by an external reference method, wherein chromatographic conditions are that: a C18 chromatographic column is taken as a stationary phase, water and the acetonitrile are taken as a mobile phase, and the mobile phase comprises the components in percentage by volume ...

Chinese parasol bacteriostatic and its processing method

The natural bacteriostatic agent is obtained by using the bark of Chinese parasol as raw material and through washing, stoving, crushing, cohobation extraction and concentration. It contains anthraquinone, flavonoid, triterpenoid, and sterol with certain bacteriostatic activity and strong anti-mould activity.

Method for detecting cigarette mainstream flue gas benzo(a) pyrene by gel infiltration-GC/MS method

The invention provides a method for detecting the benzo[a]pyrene in the main stream smoke of cigarette using gel permeation-GC-MS. The cambridge filter disc is dismounted from the smoking machine and mounted into a cone flask with plug and then is subjected to ultrasonic extraction in ultrasonic after adding cyclohexane. The extract liquid is moved into a GPC sample bottle and is leached using the cyclohexane-ethyl acetate mixed liquor and the leaching liquid is collected and concentrated in an automatic concentrating device. The internal standard solution is added into the concentrated liquid and analyzed by GC -MS apparatus to quantitate based on component peak area and internal standard peak area. The condition of the GC-MS is that: DB-5MS capillary chromatographic column; split stream or not split stream sampling; N2 as carrier gas; temperature of the injection port:230-260 degree; temperature programming. The invention has high automaticity, friend environment, easy operation, less ...

Method for detecting cigarette mainstream flue gas benzo(a) pyrene by gel infiltration-GC/MS method

The invention provides a method for detecting the benzo[a]pyrene in the main stream smoke of cigarette using gel permeation-GC-MS. The cambridge filter disc is dismounted from the smoking machine and mounted into a cone flask with plug and then is subjected to ultrasonic extraction in ultrasonic after adding cyclohexane. The extract liquid is moved into a GPC sample bottle and is leached using the cyclohexane-ethyl acetate mixed liquor and the leaching liquid is collected and concentrated in an automatic concentrating device. The internal standard solution is added into the concentrated liquid and analyzed by GC -MS apparatus to quantitate based on component peak area and internal standard peak area. The condition of the GC-MS is that: DB-5MS capillary chromatographic column; split streamor not split stream sampling; N₂ as carrier gas; temperature of the injection port:230-260 degree; temperature programming. The invention has high automaticity, friend environment, easy operation ...

Novel livestock channel structure of offshore overwater structure and construction technology of livestock channel structure

According to the scheme, the novel livestock channel structure of the offshore overwater structure comprises guardrails arranged on the offshore overwater structure, a drainage ditch is formed in one side of each guardrail, a pedestrian channel is arranged on the other side of each guardrail, a plurality of isolation doors are arranged between the guardrails, and a channel bottom plate is arranged at the bottom of each guardrail. The novel livestock channel structure of the offshore overwater structure is safe and environmentally friendly, workers can conveniently guide and command livestock, partition measures can be taken for emergency situations to guarantee follow-up normal operation, and meanwhile the construction technology is simple and easy to implement.