46results about "Material analysis by observing effect on chemical indicator" patented technology

The invention relates to a method for analyzing components in calcined lime in desulfurization of smoke. First some calcined lime powder is fetched, which is dried under 100-110 centigrade to thoroughly remove the water contained, then is burnt under 650-700 centigrade to ensure that Ca(OH)2 is completely dissolved into CaO and H2O, and CaCO3 is not dissolved, in this way the mass difference before and after the burning will be the water content generated by the dissolution of Ca(OH)2, and by the water mass, the content of Ca(OH)2 can be calculated; then the method and device disclosed in patent 200610054402.5 is used to detect the content of CaCO3. The invention is easy to operate, needs few equipment and reagent, analyzes accurately, can determine the actual contents of different components especially CaCO3 in calcined lime, because CaCO3 is an inertial substance in the calcined lime and will block the reaction with SO2 and influence the desulfurization efficiency. The invention can also be used for analyzing components in slaked lime.

The invention discloses a method for preparing an anionic colorimetric sensing cellulosic material. A titanium dioxide film is deposited on the surface of filter paper cellulose by taking natural cellulose fiber material as a matrix, and taking tetrabutyl titanate as a precursor by a surface sol-gel process; a fluoride ion colorimetric sensing cellulosic material is obtained by introducing a fluoride ion-sensitive ligand alizarin complexant molecule single layer in a self-assembly way; and fluoride ions in solution can be detected by infiltrating the material prepared by the invention in the aqueous solution of anions for a certain period of time simply, and observing the color change of the material. The anionic colorimetric sensing cellulosic material prepared by the invention has the advantages of high sensitivity and selectivity to the fluoride ions, abundant material sources, low cost, simple preparation method and simple, rapid and economic fluoride oil detection.

In an integrated optical lightguide device including a light-transmitting core layer, an inclusion or buffer layer, and an active or cladding layer. The cladding layer is divided into segments. Groups of different segments exhibit different refractive indices, light intensity profiles or different degrees of sensitivity which have been effected by different methods. Thus, repeated adjustable or controllable transmission has resulted in an extremely sensitive waveguide system for a sensor, a modulator, or a spectrophotometer.

The invention discloses a chromium-based functional nucleic acid sensor and an application thereof in the technical field of metal ion detection. The sensor comprises a molecule recognition element, asignal amplification element and a signal conversion element, wherein the molecule recognition element comprises chromium ion deoxyribozyme consisting of a substrate chain and an enzyme chain; the signal amplification element comprises an isothermal amplification system and hemin, and the isothermal amplification system comprises an amplification template; the signal conversion element comprisesa color developing agent. The sensor is based on the chromium ion deoxyribozyme, an isothermal index amplification reaction and a G-quadruplex liquid phase sensing technology, is convenient, quick, high in sensitivity, high in specificity and resistant to high salinity in chromium ion detection and can be used in field detection of chromium ions in the environment.

The invention discloses a high-salinity-resistant nucleic acid sensor for copper and application thereof. The sensor comprises a molecular recognition element, a signal multiplication element and a signal conversion element, wherein the molecular recognition element comprises copper ion deoxyribozyme; the copper ion deoxyribozyme consists of a substrate chain and an enzyme chain; the signal multiplication element comprises an isothermal amplification system; the isothermal amplification system comprises an amplification template; the signal conversion element comprises hemin and a color developing agent. The sensor provided by the invention is used for specifically recognizing a copper ion; the primary enlargement and conversion of a signal are carried out through an isothermal index multiplication reaction; a G-four-chain body structure with activity is formed under the induction of the hemin; the color developing agent is catalyzed to develop a color, thus, secondary multiplication and conversion are generated; the signal is converted into a visual signal, and the qualitative and quantitative detection in a high-salinity environment can be carried out.

The invention discloses an analyzing method for quickly and precisely measuring tellurium in a tellurium smelting process. The measuring range of the tellurium in material is 20-95% of mass percent. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process mainly includes steps that weighing a certain amount of sample, adding a proper amount of hydrochloric acid, nitric acid and sulfuric acid dissolving sample, adding bromine water to shield As and Sb interference, and using ammonium ferrous sulfate to titrate the tellurium content under a proper amount of potassium dichromate and thiophosphate. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process uses standard addition test and parallel test to verify the accuracy and precision of the method; the analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process is high in precision and capable of meeting the actual needs of the analysis and detection for the tellurium content in the material in the tellurium production process.

The invention relates to the field of biological chemistry and particularly relates to a rapid bacterium detection method. The detection method comprises the following steps: mixing a detecting sample, Cu<2+>, alkynyl and AuNPs functionalized by azide group, incubating, and observing the change of the solution color to obtain the bacterium concentration. According to the detection method provided by the invention, the specificity is strong, and the sensitivity is high, and the bacterium detection technology established by the invention has the advantages of rapidness, simplicity in operation and visible result compared with a bacteria culture method and a PCR method.

The invention discloses synthesis of a probe detecting a copper ion (Cu<2+>) and a nickel ion (Ni<2+>) by a colorimetric method, and an application in detection of Cu<2+> and Ni<2+> in a water sample.A structural formula of the molecular probe is as follows as shown in the specification. The molecular probe can give different complex reactions with Cu<2+> and Ni<2+> in an aqueous solution to showdifferent colors so as to achieve the purpose of simultaneously detecting Cu<2+> and Ni<2+> by colorimetry; a detection solution is changed to bright red from yellow after complexing of the probe andCu<2+>; the detection solution is changed to purple after complexing of the probe and Ni<2+>; a color change is obvious; a detection speed is high; and the differentiation is easy. High-sensitivity detection of Cu<2+> and Ni<2+> can be achieved in combination with ultraviolet spectrophotometry; the probe can directly detect a micro level of Cu<2+> and Ni<2+> in the water; and the limits of detection are as low as 2.1nM and 1.2nM respectively. When a pH (potential of hydrogen) is 4-10, the probe can highly sensitively detect Cu<2+> and Ni<2+> in the water sample, is simple to operate and goodin selectivity and has a higher application value in the fields of environmental science, analysis, detection and the like.

The invention relates to a mobile terminal analysis method of quantitatively processing detection results of a dry chemical detection reagent, and provides a method for quantitatively analyzing the dry chemical detection reagent through a mobile terminal. The method includes the steps that the mobile terminal is used for collecting and reading information from the dry chemical detection reagent and synchronizing the information to a cloud server; the cloud server receives the information and starts calculation and analysis, results obtained after analysis are synchronized to the mobile terminal, and therefore a user can know the detection results and meanings fast and accurately. The problems that an existing method can carry out qualitative analysis instead of quantitative analysis and is high in subjectivity and large in misjudgement rate, and the detection results can only be recorded manually and not prone to storage. By implementing the mobile terminal analysis method, the user can obtain the detection results and meanings fast, easily and conveniently.

The invention provides a reporter gene assay method by which the sex hormone-like activity inherent in a test substance can be accurately assayed excluding the effects caused by a decrease in cell activity (protein expressing capacity). The assay method is a reporter gene assay method using luciferase-expressing cells which comprises further tranferring a GFP gene into the luciferase-expressing cells, measuring the luciferase expression level and GFP expression level, and making a judgment about the thus-measured luciferase expression level using the decrease in GFP expression level as an indication of the decrease in cell activity.

The invention belongs to the technical field of clinical in vitro diagnostic reagents and relates to a dry chemical reagent tablet for quantitatively measuring the concentration of total cholesterol and a preparation method of the dry chemical reagent tablet. The dry chemical reagent tablet comprises four laminations which are respectively a support layer, a color developing layer, a reagent layerand a diffusion layer distributed sequentially; and reagents in the reagent layer include a buffer system, a hydrophilic colloid, peroxidase, an activator, a surfactant and a stabilizer; and reagentsin the color developing layer include a chromogen and a hydrophilic colloid. Compared with the prior art, the dry chemical reagent tablet and the preparation method thereof of the invention have theadvantages of simple operation process, high stability, high good repeatability and high accuracy of detection results, quantitative detection, wide linear range, simple and convenient preparation process, easiness in operation, low risk and low pollution. According to the dry chemical reagent tablet and the preparation method of the dry chemical reagent tablet of the invention, the reagents do not need to be prepared, and samples can be directly added dropwise; the reagent tablet is dry and is free of moisture; the diffusion layer has a filtering function, so that hemolysis, bilirubin and ascorbic acid samples exert no significant interference on measurement results.

The invention discloses a method for measuring the content of L-carnitine in infant foods and dairy products by spectrophotometry. According to the research, by utilizing a principle that free L-carnitine in the products can react with acetylcoenzyme to generate acetylcarnitine and free coenzyme, the amount of yellow substances generated by reaction between the free coenzyme and a color developingsolution is detected through the spectrophotometry, thereby indirectly calculating the content of the L-carnitine in a sample. An experimental result shows that the addition amount of an acetylcoenzyme solution is 80 [mu] L, the addition amount of a carnitine acetyltransferase solution is 100 [mu] L, the reaction time is 5 minutes, and accurate, economic and rapid detection requirements can be met.

The invention provides a solution for evaluating the glucose metabolism based on the sialology method and an evaluation method thereof. The solution comprises the following components: 60-150 mM of pH 7.6 Tris-HCl, 0.12-0.4% of blue chromogenic substances; 1200-2500 IU/L of glucose oxidase; 120-250 IU/L of horse radish peroxidase; and 600-1500 IU/L of antioxidant. The evaluation method comprises the steps of 1) collecting the saliva; 2) mixing the saliva with the above solution; 3) determining the level of glucose metabolism of an organism according to the color depth of the mixed solution of the saliva and the solution. According to the technical scheme of the invention, the level of glucose metabolism is evaluated by adopting the above solution that can change in color depth after reacting with the saliva. In this way, the inconvenience caused by the detection of the blood glucose can be solved. Meanwhile, the evaluation method is visual, convenient, fast, high in efficiency and high in accuracy. At the same time, the antioxidant is added into the above solution, so that the storage life of the solution is prolonged. Moreover, the waste is avoided and the cost is saved.

The invention provides a method for detecting a peroxide value of food grease. The method comprises the steps of: S1, soaking a color developing slice in a color developing solution, taking out the color developing slice after soaking, and drying the color developing slice for later use; S2, taking crushed grease processed food or nut powder, putting the food or nut powder on the color developingslice, and covering the color developing slice with aluminum-foil paper; S3, and heating the color developing slice in the step S2 on a heater, observing color changes of the color developing slice, and comparing the color developing slice with a colorimetric card to judge the content of the peroxide value in the food grease. The method conforms to the Chinese standard, can detect the content of peroxide in grease in a short time on site, and judges whether the food is fresh or not, thereby improving the food detection efficiency, and preventing unqualified food from flowing into the market.

The invention discloses a method for detecting systemic pesticide dimethoate residue. The method comprises the following steps: step a, crushing a sample to be detected to obtain a first sample; step b, adding a sodium salt solution and chloroform into the first sample, performing centrifugal treatment until the solution is obviously layered, and taking a chloroform phase solution to obtain a first sample solution; step c, blow-drying the first sample liquid to obtain a first substance to be detected; step d, adding diethylamine into the first substance to be detected, redissolving, adding an oxidizing agent, adjusting the temperature to 80 DEG C, standing to obtain a second sample solution, and blow-drying to obtain a second substance to be detected; step e, adding an ether organic solvent into the second substance to be detected, redissolving, slowly adding a buffer solution, adding an acetylcholin esterase reagent, and standing; step f, adding a substrate and a color developing agent, standing for 3 minutes, observing the color change of a lower layer after the solution is layered, shaking, standing, and observing the color change of the lower layer after the solution is layered; and step g, judging a result.

The invention relates to a functional textile and aims to provide a preparation method of a color-changeable cloth capable of quickly indicating heavy metal ions in water. The provided method should be simple and efficient to prepare the color-changeable cloth so as to realize rapid detection of the heavy metal ions in water. Another object of the present invention is to provide a method for detecting heavy metal ions in water by using the color-changeable cloth. The technical solution is as follows: the preparation method of the color-changeable cloth capable of quickly indicating heavy metalions in water is carried out according to the following steps: 1) material preparation: (1) color developing agent working liquid: weighing 0.5-5g of malachite green, and dissolving the malachite green with a 0.1-1.0% ethanol aqueous solution in a 100-1000mL volumetric flask to constant volume to obtain the color developing agent working liquid; and (2) dyeing material: a dry cotton cloth is adopted; and 2) cloth coloring.

The present invention relates to a strip for measuring blood lipids. The strip for measuring blood lipids, of the present invention, presses, with an optimal pressure or to an optimal height, a contact surface of a protruding part of a measurement layer disposed between an upper cover and a lower substrate, so as to improve the uniform diffusion of a biological sample, thereby having an effect of increasing measurement result accuracy of the biological sample.

The invention provides formaldehyde detection test paper, a preparation method thereof and a formaldehyde detection system. The formaldehyde detection test paper comprises a hydrophilic layer prepared from an air-permeable hydrophilic material and a hydrophobic layer formed by inorganic particles attached to one side of the hydrophilic layer, at least the hydrophobic layer contains a formaldehyde developing reagent; the formaldehyde detection system comprises a formaldehyde detection module and formaldehyde detection test paper, wherein the formaldehyde detection test paper is detachably mounted in a detection cavity of the formaldehyde detection module. The inorganic particles are attached to the surface of one side of the hydrophilic layer prepared from the breathable hydrophilic material to form the hydrophobic layer containing the formaldehyde color developing reagent, and the formaldehyde color developing reagent develops color in the hydrophobic layer to detect the concentration of formaldehyde, moisture in the hydrophobic layer can enter the hydrophilic layer under the action of the hydrophilic layer, thus moisture influencing the formaldehyde detection accuracy in the hydrophobic layer is avoided, and the influence of humidity on formaldehyde detection is avoided.

The invention discloses a kit for quickly detecting water sample lead on site. The kit comprises a lead detection reagent, a lead test paper, a standard lead color card and a consumable material which are independently packaged, wherein the lead detection reagent includes a hydrochloric acid eluant and a sodium hydroxide neutralizing solution; the lead test paper is arranged as a sulfydryl dithizone test paper; the standard lead color card is arranged as a colorful picture after the developing reaction of 10ul standard lead solution on the sulfydryl dithizone test paper; the consumable material includes sulfydryl adsorption filter paper, a water sampling sucker, an external box, a filtering elution bracket, a shafting liquid absorber, an effluent tank and an elution plate. The kit has the beneficial effects that (1) the operation process is greatly simplified, the detection time is shortened, the detection can be completed within 30min and the quick qualitative determination for the lead on the sampling site can be realized; (2) high-cost device and high-level technicians are not required; (3) the detection sensitivity, stability and reliability all meet the requirement of hygienic evaluation standard; and (4) the test paper, the consumable material and the reagent are respectively independently packaged and are portable.

The invention relates to a technology for detecting the content of active ingredients of a disinfectant, in particular to test paper for determining the content of chlorine dioxide and a preparation method thereof. The test paper comprises a test paper substrate and a test paper detection base layer adhered to one end of the test paper substrate, and the test paper detection base layer is coated with a reaction substrate which is colorless and develops color after being in contact with chlorine dioxide. Compared with the prior art, a solution method is converted into a test paper method, a specific environment and professional operation skills are not needed, and when detection is needed, rapid detection can be achieved, the detection speed is high, the color gradation of a detection result is clear, indication is accurate, and use is convenient; the test paper for rapidly detecting the concentration of the chlorine dioxide disinfectant can be used in the industries of medical treatment and public health, food processing, catering and the like, and has the characteristics of accurate concentration indication, clear color gradation of different concentrations, simplicity and convenience in operation, high test speed, no toxicity to a human body, high safety and the like.

The invention is applicable to the technical field of protein quantification, and provides an amino black staining solution, a kit and a method for detecting protein content. The kit comprises an amino black staining solution, a rinsing solution, an eluent and a plurality of groups of standard protein solutions with different concentrations; the amino black staining solution comprises methanol, glacial acetic acid, amino black and water. The invention provides the kit containing the amino black staining solution. Amino groups and carboxyl groups of amino acids in the protein are fully utilizedto react in a proper acid-base environment, so that protein is positively charged; amino black appears in the form of negative ions, and a large number of dye molecules are deposited on the surface of the protein under the interaction of positive and negative charges, so that protein traces are shown in dye colors, and the protein quantification method is simple to operate, high in sensitivity and good in accuracy.

The invention relates to an on-line colorimetric pH measuring instrument for water vapor detection of a power plant, and belongs to a water quality chemical analysis instrument. The instrument comprises a multi-path sample injection valve, an overflow device, a water shortage detection device, a channel selection valve, a peristaltic metering pump I, a peristaltic metering pump II, a mixer, an automatic thermostat, a photometer, a pH 6.86 standard liquid barrel, a pH 9.18 standard liquid barrel, a pH 10.0 standard liquid barrel and a phenolphthalein indicator barrel. The instrument has the advantages that the non-traditional glass electrode is used as the pH sensor, the glass electrode and corresponding accuracy influence factors are eliminated, the photometer with high stability and accuracy is used for measurement, the measurement accuracy and reliability are greatly improved, the workload of instrument maintenance personnel is reduced, and the method is a novel method for online measurement of the pH of a steam-water system of a power plant. According to the characteristic of slow change of water quality pH of a power plant, time-sharing measurement of more paths of water samples can be expanded.