Rapid detecting method of nitrite in drinking water

The invention discloses a rapid detecting method of nitrite in drinking water. The rapid detecting method comprises the following steps of adsorbing the nitrite in a large volume of water sample by using an efficient adsorption column (wherein a padding is laminated magaldrate) for detecting multiple harmful negative ions in the drinking water, eluting and adsorbing the nitrite on an adsorbent by using a small volume of eluent, performing high-expansion concentration, forming a red chelate by the nitrite after the concentration and an indicator under an acidic condition, comparing the color of the red chelate with those on a color comparing card to judge whether the nitrite is overproof, and finishing the preliminary screening of the water sample. The rapid detecting method of the nitrite in the drinking water, provided by the invention, has the advantages that the detection on the nitrite in the water sample is finished in site, the time consumption is short, the sensitivity is high, the ...

Quick detection method for dithiocarbamate pesticide residue

Special solid-phase extraction cartridge for glyphosate and metabolite-aminomethyl phosphonate of glyphosate, and application of solid-phase extraction cartridge

The invention provides a special solid-phase extraction cartridge for glyphosate and metabolite of the glyphosate, and an application of the solid-phase extraction cartridge, wherein filler comprises anion adsorption filler, acidic material adsorption filler and a filter aid; the anion adsorption filler is magnesium-aluminum binary hydrotalcite and has the molecular composition formula of MgAl3(OH)16 CO3. 4H2O; the acidic material adsorption filler is ethylenediamine-N-propyl silicane; the filter aid is kieselguhr celite 545 filler; the weight ratio of the anion adsorption filler to the acidic material adsorption filler to the filter aid is 2 to 2 to 1. The special extraction filler for the glyphosate and the metabolite-aminomethyl phosphonate of the glyphosate is high in adsorption capacity and column capacity, is capable of effectively eliminating the interference of impurities such as vegetable oil, fat and acidic materials in food, has the recovery rate reaching up to more than 90%, ...

Adjustable micro - solid powder sampler

The utility model relates to an adjustable micro - solid powder sampler, which comprises a cylinder outer shell, the inner chamber of shell divide into adjacent main cavity and vice chamber, main cavity upper portion is fixed with adjusting nut, main cavity upper portion also passing through has and adjusting nut engaged with adjusting screw, the adjusting screw end is provided with the connecting sleeve, main cavity lower part passing through has the regulating sterm, the regulating sterm overcoat is equipped with the fixed sample sleeve with shell threaded connection, the regulating sterm head inserts the connecting sleeve and the relatively fixed sample sleeve up -and -down motion along with adjusting screw's helical motion, fixed sample sleeve overcoat is equipped with activity sample sleeve, vice intracavity passing through has the sample depression bar with activity sample sleeve looks lock joint, the regulating sterm end is provided with the sampling head, regulating sterm, sampling ...

Method for identifying tea tree varieties of Tieguanyin, Benshan and Fuyun 6, SNP molecular marker combination and application of SNP molecular marker combination

The invention relates to the technical field of molecular identification, in particular to a method for identifying Tieguanyin, Benshan and Fuyun 6 tea tree varieties, an SNP molecular marker combination and application of the SNP molecular marker combination. The method comprises the following steps: amplifying a sample to be detected by utilizing PCR (Polymerase Chain Reaction); if the sequence SEQ ID NO.1 and the sequence SEQ ID NO.2 are not amplified and the sequence SEQ ID NO.3 is successfully amplified, the sample to be detected is judged to be the Tieguanyin tea tree variety; if the sequence SEQ ID NO.1, the sequence SEQ ID NO.2 and the sequence SEQ ID NO.3 are not amplified, judging that the sample to be detected is the camellia variety; if the sequence SEQ ID NO.1, the sequence SEQ ID NO.2 and the sequence SEQ ID NO.3 are all successfully amplified, the sample to be detected is determined to be the Fuyun No.6 tea tree variety. The method has the beneficial effects that the three ...

Compound medicine contg. famotidine cyclodextrin clathrate, and its prepn. method

Quick detection method for pyrethroid pesticide residue

Portable intelligent ammeter simulation system and operating method thereof

The invention relates to a portable intelligent ammeter simulation system and an operating method of the portable intelligent ammeter simulation system. The portable intelligent ammeter simulation system comprises a draw-bar box. The draw-bar box comprises a box body internally provided with a simulation system. A cavity for containing an ammeter is formed in the middle of the front face of the box body, a display screen window for containing a display screen is formed above the cavity, and an interface is arranged in the side wall in the cavity, so that a data communication interface of the ammeter is conveniently connected to the simulation system through the interface and an interface circuit corresponding to the interface, the simulation system is further connected to the display screen through a display screen driving circuit and further connected to a deconcentrator below the cavity through a USB interface circuit, and a containing groove for containing a PDA is formed beside the ...

Preparation method of laminated magaldrate

The invention discloses a preparation method of laminated magaldrate. The preparation method comprises the following steps: putting raw materials with a certain ratio in a high-pressure tank; adding certain amount of deionized water and covering the tank with a cover; putting the sealed high-pressure tank into a drying oven, adjusting the temperature of the drying oven to a certain value and heating for a period of time; taking out laminated magaldrate from the tank after heating, washing with water to be neutral, putting the washed laminated magaldrate into the drying oven and drying at a certain temperature; putting the dried laminated magaldrate into a muffle furnace and calcinating at a certain temperature for multiple hours. The prepared calcinated laminated magaldrate has the advantage of being strong in anion adsorption capability, uniform in texture and short in synthesis cycle.

Be applied to freezing cleaner in pretreatment of quEChERS method

The utility model relates to a be applied to freezing cleaner in pretreatment of quEChERS method, its characterized in that: including the outer tube with establish at the internal inner tube that covers of outer tube, be equipped with the fixed plug -in components that are used for fixed inner tube between outer wall of the inner tube and the outer inside pipe wall. The utility model discloses can effectively get rid of the lipid material that the acetonitrile solvent extraction goes out in the quEChERS method to extend the application among the harmful substance detection area in the higher matrix of fatness of this method.

Method for rapidly detecting borate in drinking water

The invention discloses a method for rapidly detecting borate in drinking water. The method comprises the following steps: adsorbing borate in a large-volume water sample through a high-efficiency adsorption column for detecting multiple harmful negative ions in the drinking water (the packing is layered magnesium aluminum hydroxide), and eluting the borate attached to an adsorbent by using a small-volume eluent, so that high-rate concentration is realized; developing the concentrated borate and an indicator under the condition that a certain amount of buffer solution is added, comparing with colors on a color chart, judging whether the borate in the water sample exceeds the standard, and thus finishing preliminary screening of the water sample. According to the method for rapidly detecting borate in drinking water, detection of the borate in the water sample can be finished on site, and the method has the advantages of low time consumption, high sensitivity, simple and convenient operation ...

Many inverter of single electric source stage antithetical couplet type

The utility model discloses a many inverter of single electric source stage antithetical couplet type, many inverter of single electric source stage antithetical couplet type is by transistor, power,condenser and resistors. The utility model discloses need a large amount of independent DC power supply's shortcoming to improve to prior art, the device characteristics of utilizing the condenser tocarry out the charge -discharge, the cooperation through redundant switch realizes the frequent charge -discharge to the condenser, and is through the cooperation of independent DC power supply and condenser, feasible the utility model provides a many inverter of single electric source stage antithetical couplet type is a DC power supply steady operation singly. Independent DC power supply's reduction can reduce the integrated volume that cascades many inverter, on the basis that does not increase the transistor, has reduced power switch device action quantity few as far as possible in an action ...

Potato powder matrix standard sample containing flumorph residue and preparation method thereof

The invention belongs to the technical field of plant-derived food matrix standard substances of pesticide residue detection, and particularly relates to a potato powder matrix standard sample containing flumorph residue and a preparation method thereof. The preparation method comprises the steps that a high-purity flumorph sample is prepared into a solution, potato powder is added into the solution and is wetted completely, and the flumorph and the potato powder are fully fused through sealing and soaking for 200 h; then the solution is arranged in a fuming cupboard, and a bottle plug is opened, so that an organic solvent is volatilized dry; the matrix standard sample is mixed evenly and subpacked; the formed stable and uniform matrix sample is dried, mixed evenly and subpacked to form the matrix standard sample; the matrix standard sample is checked and valued; uniformity and stability detection and collaborative valuing are carried out on the obtained matrix standard sample.

BIM-based mass concrete construction intelligent management platform

The invention relates to a BIM-based mass concrete construction intelligent management platform. The system comprises a mass concrete special construction intelligent design module, a mass concrete early-stage preparation stage intelligent monitoring module, a mass concrete pouring stage intelligent monitoring module, a mass concrete later-stage maintenance stage intelligent monitoring module and an information management system provided with a data interaction interface. The application degree of the informatization technology in the mass concrete construction process can be greatly improved, and the construction efficiency is improved.

Tail gas recycling system and process used for stable co-production of melamine and urea

The invention discloses a tail gas recycling system used for stable co-production of melamine and urea and a process for adopting the tail gas recycling system to perform stable co-production of melamine and urea. The process comprises the following steps: performing two-stage decomposition on a urea synthetic reaction liquid from the outlet of a urea synthesis tower by adopting a medium-pressure decomposition tower and a two-stage decomposition stage to prepare urine with the mass concentration of 60% to 80%, and feeding the urine to an original evaporation system; and preparing melamine synthesis tail gas into a thick methylamine liquid with the concentration of 60% to 80 through two-stage condensation and absorption, and returning the thick methylamine liquid to an original high-pressure system for being recycled. According to the process disclosed by the invention, the adverse effect caused by the load increase of an original stripping tower is avoided, so that an original urea device ...