324 results about "Paper sample" patented technology

The invention discloses a test method of a banned azo-dye in cigarette paper and belongs to the technical field of physical and chemical inspection of harmful substance residues in lined paper, tipping paper and carton packaging paper for cigarettes. The test method is characterized by comprising the following steps: cutting a cigarette paper sample, adding a reduction solution, reducing an azo substance into aromatic amine by sodium hydrosulfite in a citric acid buffer solution, extracting aromatic amine from the solution by a liquid-liquid extraction method, concentrating, redissolving by methanol, testing by a liquid chromatography-tandem mass spectrometry combined instrument, and quantifying by an internal standard method. According to the method, the deficiencies of a sample treatment method in the prior art are overcome, and a sample pre-treatment method and instrument test conditions are optimized for the tipping paper, the lined paper and the carton packaging paper for the cigarettes; as a solid-phase extraction column does not need to be passed, cumbersome purification and concentration steps such as rotary evaporation are not required, and the method has the advantages of accuracy for operation, high recovery rate, quickness, simplicity, convenience, high sensitivity and the like.

The invention discloses a closed type chromatography test paper detection device and an application method of the closed type chromatography test paper detection device. The closed type chromatography test paper detection device comprises a solution tube, a connection tube and a test paper tube, wherein the tube body bottom of the solution tube is provided with a bottom structure with shear marks; the inner wall circumference surface of the tube body of the solution tube is provided with two grooves, one groove allows repeated opening of a cover of the solution tube, and the other groove reversely hooks the cover to form the closed environment; the inner circular wall of a counter bore-shaped connector of the connection tube matched with the solution tube is provided with a convex sealing ring, the convex sealing ring is matched with the groove of the solution tube and then hooks reversely to form the closed environment; the bottom of the connector of the connection tube, for insertion of the solution tube, is provided with a structure interacting with the bottom structure of the solution tube to release solution; the connector between the connection tube and the test paper tube is internally provided with the convex sealing ring, the convex sealing ring is matched with the groove outside the test paper tube and then reversely hooks to form the closed environment; and moreover, other solution tubes can be stacked and sleeved on the solution tube so as to form multiple sleeves. The closed type chromatography test paper detection device is small in volume, can realize complete closure, and can completely prevent influence and pollution to the environment caused by the sample in the chromatography test paper sample solution.

The invention discloses a spectrophotometer for the chromaticity detection of laser paper and belongs to the technical field of optical detection instruments. In the spectrophotometer disclosed by the invention, the spherical surface of a diffused lighting integrating sphere is provided with a sample reflecting hole, an incident hole of the diffused lighting integrating sphere and an exit hole of the diffused lighting integrating sphere; the spherical surface of a diffused accepting integrating sphere is provided with an incident hole of the diffused accepting integrating sphere and an exit hole of the diffused accepting integrating sphere; the exit hole of the diffused lighting integrating sphere and the incident hole of the diffused accepting integrating sphere are same in diameter and are in butt joint with each other; and the sample reflecting hole is connected with a laser paper sample, a flat-filed concave grating is arranged in front of a light path of the exit hole of the diffused accepting integrating sphere, a photoelectric converter, namely a linear array CCD (charge coupled device) is arranged in front of a dispersive light path of the flat-filed concave grating, and the electrical signal output end of the linear array CCD is connected with a signal processing system. The spectrophotometer disclosed by the invention is reasonable in design, simple in structure, and convenient in use, and can be used for correctly measuring the surface spectral reflectances and colorimetric values of all types of laser paper.

This invention relates to one analysis and test method for micro element, which comprises the following steps: a, cutting and mixing cigarette paper sample into anti-acid container; b, adding 10-20ml aqua fortis, Fraude's reagent mixture per gram; c, heating on board with temperature of 150 to 180 degrees to generate brown gas for cooling; d, transferring to above heating board near drying with 0.5-1ml left; e, cooling the above liquid and solving alcaine for 3mol / L then adding 10ml ascorbic acid and sulfourea and then adding alcaine of 3mol / L to 25ml; f, using atom fluorescence meter to draw correction curve; g, using step e to test fluorescence intensity to get the concentration to compute arsenic content.