258results about How to "The determination method is simple" patented technology

The invention provides an edible oil quality inspection method based on 1H-nuclear magnetic resonance (NMR) fingerprint spectra and multivariate analysis. The edible oil quality inspection method is mainly characterized by comprising steps of developing 12 1H-NMR fingerprint spectra for identifying swill-cooked dirty oil; establishing an oil 1H-NMR fingerprint spectrum database according to the 12 1H-NMR fingerprint spectra; classifying samples in the database by clustering analysis; establishing a discriminant function, substituting 1H-NMR data of an unknown sample into the discriminant function; and judging the quality of the unknown sample according to a calculated result. The edible oil quality inspection method has the advantages of small sample quantity, simple pretreatment method, high sensitivity, low cost and high accuracy.

The present invention provides a method for detecting concentration of hydroxyl radical. In the system produced by adding capture agent terephthalic acid sodium salt (NaTA) into hydroxyl radical, 2-hydroxyl terephthalic acid (HTA) is produced by reaction of terephthalic acid sodium salt and hydroxyl radical, which has stable fluorescence and is detected by fluorescence spectrophotometer (excited wavelength lambada ex=315 nm, projecting wavelength lambada em=425 nm), and then the concentration of 2-hydroxyl terephthalic acid is conversed to the concentration of hydroxyl radical. The detecting method of present invention is easy to do, credibility and nicety, especial for used in the conditions of circumstance produced hydroxyl radical at the value of pH<12, or the solution of the hydroxyl radical produced system required the conductivity.

The invention discloses a method for detecting a heavy metal content of coal gangue filling reclamation reconstruction soil based on a high spectrum technology. The method comprises the steps of performing sampling on site; collecting a sample spectrum curve; performing data processing; constructing a high spectrum estimation model for inverting soil heavy metal content; constructing a partial least squares regression model; and finally utilizing the partial least squares regression model to detect the heavy metal content of the coal gangue filling reclamation reconstruction soil. Compared with a conventional multiple linear regression analysis method, according to the method, the problem of multicollinearity faced by the multiple linear regression analysis method is solved, spectral information can be summarized and extracted, system information and noise are identified more easily, and thus the content of heavy metal elements can be quantitatively inverted accurately. The simple and quick detection method is provided for large-area low-cost investigation and monitoring of heavy metal pollution of mine lot reclamation land soil, technical means are provided for guaranteeing mine lot reclamation land crop safety, and development and application of a high spectrum remote sensing technology are promoted.

A estimation method of the biotransformation of industrial sewage, it relates to a estimation method of the biotransformation of waste water in sewage treatment. To solve the problem that the measurement error because of high-power diluting and the measure period is too long in the present measurement, the invention using the dissolve oxygen detecting instrument detect the endogenous respiration oxygen consumption and the biochemical breath oxygen consumption of industrial sewage, estimating the biotransformation of industrial sewage according to the relative oxygen consumption: when the water sample waiting for measuring ROC> 1, explaining that the base material does not poison or inhibit the action of the microorganism, the bigger the ROC value is the better the biotransformation of waste water waste is; When the water sample waiting for measuring ROC <1, explaining that base material poisons or inhibits the action of the microorganism, the smaller the ROC value is the stronger the toxicity of the waste water is, the worse the biotransformation of waste water waste is. The invention uses a method by detecting the oxygen consumption rate of microorganism, can detect the impact of different waste water thickness to the action of the microorganism, it avoids the error of high power dilution; and the method is simple, rapid, it can gain the measurement result in 30 ~ 60 min.

The invention relates to a microbiological indicator evaluation method for quality of salinization, petroleum and heavy metal combined contaminated soil. The method includes the steps of selecting a microbiological indicator evaluation factor, determining weight of the microbiological indicator evaluation factor, calculating an evaluation coefficient of the microbiological indicator evaluation factor, and determining environmental quality level of the soil. The method is applicable to accurately measuring most types of salinization, petroleum and heavy metal combined contaminated soils under different soil conditions. The microbiological indicator evaluation method for quality of salinization, petroleum and heavy metal combined contaminated soil has the advantages that the method is economical, simple and highly operable; the microbiological indicator evaluation factor has a background value or control value easy to measure; the microbiological indicator evaluation factor is flexible and reliable enough for salinization, petroleum and heavy metal combined contamination and is more stable than other evaluation factors.

The electrochemical rapid detection method for the corrosion degree of steel bars in concrete structures under different conditions provided by the present invention adopts the combination of half-cell detection, resistivity detection and environmental factors, forms a half-cell by soaking the concrete surface with a conductive solution, and combines the environmental temperature , environmental humidity, fly ash content, chloride ion content and the thickness of the protective layer, the corrosion potential of the steel bar at the measuring point and the resistivity of the concrete are obtained by the look-up table method or the interpolation calculation method to determine whether the steel bar is corroded and the corrosion rate, and the determination process is fast ; Determination method is simple and easy; integrated two electrochemical detection methods, the result is more accurate.

The invention discloses a device for sampling asphalt smoke dust, which consists of a closed container, a heating furnace, a temperature controller, a freezer, an absorption device, a water container and a dry air supplying device, wherein an air outlet of the dry air supplying device is connected with an air inlet of the closed container; an air outlet of the closed container is connected with an air inlet of the absorption device; an air outlet of the absorption device is positioned under the liquid level of the water container; the heating furnace is connected with the temperature controller; a temperature sensing part of the temperature controller is connected with the closed container; the heating furnace is used for heating the closed container; asphalt with unit mass is arranged inthe closed container; the absorption device is arranged in the freezer; adsorption substance is arranged in the absorption device; and the freezer is internally provided with cooling substance. The invention also discloses a method for measuring the content of the asphalt smoke dust. The invention has the beneficial technical effects that the sampling device is simple in structure and convenient to operate, the measurement method is simplified and rapid, and the measurement result is high in accuracy.

The invention relates to a chloride ion measuring method of leveling liquid that is used in steel plate rolling, which is implemented according to following steps: firstly, a certain amount of the leveling liquid sample to be measured is placed into a porcelain crucible which is placed into a baking oven for drying; secondly, the dried sample is placed into a retort furnace so as to be cauterized, and then taken out and cooled; thirdly, the sample that is processed by the second step and the crucible are rinsed by secondary distilled water, rinsed liquid is added into a sample solution until a certain volume value is reached, and ultrasonic oscillation is used for dissolving the chloride ions of the sample in the water; fourthly, a certain amount of the solution that is processed by the oscillation and contains the chloride ions is filtered by a filter paper, a filtered solution is collected, the chloride ion content in the filtered solution is measured by the Mohr volumetric method, and simultaneously a same amount of the secondary distilled water is used for blank titration, and the final chloride ion content in the leveling liquid can be obtained by computation. The chloride ion measuring method of the invention has the advantaged of simplicity and low test cost.

The invention relates to a method for measuring zinc and nickel contents in a zinc-nickel alloy electroplating solution and belongs to the technical field of methods for analyzing the electroplating solution. The method is mainly and technically characterized by comprising the following steps of: reacting dimethylglyoxime and Ni4+ to form a red soluble complex in the presence of an oxidant ammonium persulfate, adding sodium tartrate to eliminate iron and other impurity interference, and measuring the content of nickel in the zinc-nickel alloy electroplating solution by employing a colorimetric method; adding tartaric acid to mask iron and other impurities, with CuY-PAN as an indicator, titrating in an acetic acid-sodium acetate buffer solution with the PH being 5.5 by using an ethylene diamine tetraacetic acid (EDTA) standard titration solution by utilizing a replacement titration principle, calculating the total contents of zinc and nickel in the zinc-nickel alloy electroplating solution, and subtracting the nickel content from the total contents of zinc and nickel to solve the zinc content in the zinc-nickel alloy electroplating solution. The measurement method has the characteristics of simpleness in detection, convenient, rapid and environment-friendly detection process, low cost, accurate and consistent detection result and the like.

The invention discloses a device and a method for measuring a permeability coefficient of cement-soil. The device comprises a variable cross-section transparent organic glass tube (1), and an adapter (2) for connecting the variable cross-section transparent organic glass tube (1) with a sample (3), wherein the lower end of the adapter (2) is arranged in a rubber membrane (4) in a sleeving manner to be connected with the sample (3), the gap between the adapter (2) and the rubber membrane (4) is tightened by utilizing a rubber seal ring (8), a permeable stone (5) and a permeable stone (6) are arranged at the upper end and the lower end of the sample (3), and the device is placed in a water tank (9). The device and the method provided by the invention have the advantages of simple operation, cheapness in fabrication and stronger applicability.

The invention relates to a method for selectively determining residual vinyl acetate in white latex for cigarette through static headspace and gas chromatography mass spectrometry, belonging to the technical field of physical and chemical inspection of materials for the cigarette, and provides a quantitative selected ion determining method through the static headspace and gas chromatography mass spectrometry, aiming at selectively determining the residual vinyl acetate in white latex for the cigarette. A sample of the white latex for the cigarette after static headspace at 80 DEG C for 15 minutes is detected by taking 2-hexanone as an internal standard through HP-INNOWAX column in a GC-MS/SIM (Gas Chromatography Mass Spectrometry/Selected Ion Monitoring) mode, and is quantified through an internal standard method. According to the method for selectively determining the residual vinyl acetate in the white latex for the cigarette through the static headspace gas chromatography mass spectrometry, disclosed by the invention, detection limit, labeling recovery ratio and RSD (Relative Standard Deviation) of the method are respectively 0.63mg/kg, 104-107% and 2.5-4.9%; in addition, the method disclosed by the invention has the characteristics of simpleness, fastness, accuracy, sensitiveness and the like, and is especially suitable for quantitative analysis on the residual vinyl acetate in the white latex for the cigarette.

The invention discloses a method for determination of calcium sulfite and calcium carbonate content of flue gas desulfurization gypsum and belongs to the method for determination of calcium sulfite and calcium carbonate content. The method comprises respectively dissolving flue gas desulfurization gypsum subjected to full oxidation treatment and unoxidized flue gas desulfurization gypsum by a diluted hydrochloric acid solution, determining mass losses of the flue gas desulfurization gypsum and the unoxidized flue gas desulfurization gypsum by an analytical balance in dissolution, calculating calcium carbonate content of the flue gas desulfurization gypsum according to the mass loss of the flue gas desulfurization gypsum subjected to full oxidation treatment, and calculating total content of calcium sulfite and calcium carbonate of the flue gas desulfurization gypsum according to the mass loss of the unoxidized flue gas desulfurization gypsum, wherein the difference of the calcium carbonate content and the total content of calcium sulfite and calcium carbonate is the total content of calcium sulfite of the flue gas desulfurization gypsum. Calcium sulfite of the flue gas desulfurization gypsum produces large influence on portland cement setting time and strength, and through determination of calcium sulfite and calcium carbonate content, flue gas desulfurization gypsum slow setting effects on portland cement can be determined. The method promotes large scale use of flue gas desulfurization gypsum as industrial waste residue. The method has the advantages of simple determination method, accurate result and low determination cost.

The invention relates to a method for measuring the cohesiveness of cement-based building mortar, belonging to the field of cement mortar performance detection. The method is suitable for detection of the building mortar, particularly the building mortar prepared by various types of machine-made sand. The method comprises the following steps of A, preparing the mortar; B, measuring the water use amount of the mortar; and C, measuring the expansion degree of the mortar. According to the measurement method, the target thickness meeting the requirement of actual production is firstly determined by virtue of measurement on the water use amount of the mortar; then the aim of estimating and controlling the cohesiveness of the building mortar is fulfilled by measuring the expansion degree of the mortar, so that a standard support for supplying mortar suitable for building site construction can be achieved in actual production; meanwhile, the operability of directly and objectively estimating the cohesiveness of the mortar can be improved.

The invention discloses a method for measuring the length of a liquid core of a casting blank, which belongs to the technical field of steel continuous casting. The method comprises the following steps: during the continuous casting, a tracer is added in the liquid core in the center of the continuous casting blank and flows to the tail end of the liquid core, when the continuous casting blank is cooled down and solidified, the tracer is sampled and is subjected to split detection. The method for measuring the length of the liquid core of the casting blank, which replaces the prior bolt striking method, can accurately and directly find the liquid core position of the casting blank; and by utilizing the method, the actual solidifying condition of the casting machine can be better shown, and the cross sectional shape of the liquid core and the cross sectional diameter of the liquid core with the corresponding casting blank length can be measured. The measurement method of the invention has the advantages of simpleness, accuracy, easy operation, low cost, fast result derivation and convenient popularization and application.

The invention discloses a method for classifying artificial wetland obstructions and extracting components of the artificial wetland obstructions, which belongs to the technical field of sewage treatment and particularly relates to a method for classifying inter-matrix obstructions and extracting components of the inter-matrix obstructions in an artificial wetland sewage treatment technology. The artificial wetland obstructions are definitely and primarily classified into five substances, i.e., protein, polysaccharide, humic acid, nucleic acid and inorganic matter, and the like; various components of the wetland obstructions are extracted by using methods of adding strong alkali, heating and centrifuging in sequence; and the components of the obstructions are quantitatively measured in combination with a Coomassie brilliant blue method, a sulfuric acid-anthrone method, a diphenylamine method, an improved lowry method and a gravimetric method. According to the invention, the components of the obstructions are classified more comprehensively, good obstruction classification and quantitative description effect is realized, the component extracting method is simple and feasible, the components of the obstructions can be measured in most of routine test labs, and the cost required for measuring the components of the obstructions is low; the method is high in popularity, simple and easy to learn; and the control conditions can be easily guaranteed and the interference resistance is good.

The invention relates to a measuring method of length of a convolution region of an air vent of a COREX fusion gasification furnace. The method comprises following steps that 1) sampling is performed; 2) gap degrees of air vent coke samples in different positions are calculated; 3) the distance from sampling points to an air vent is taken as the abscissa and the gap degrees of air vent coke samples is taken as the ordinate to draw a coordinate graph; 4) and a catastrophe point exists in the gap degrees of air vent coke samples in the coordinate graph, and the distance between the corresponding position of the catastrophe point and the air vent is the length of the convolution region of the air vent of the COREX fusion gasification furnace. According to the invention, the length of the convolution region of the air vent of the COREX fusion gasification furnace is calculated by measuring the gap degrees of air vent coke samples, and the method is simple, feasible, accurate and reliable and can be taken as the basis for determining the furnace conditions of the COREX fusion gasification furnace.

The invention discloses a determination method for insoluble substances in a polymer. The determination method comprises the following steps of a. weighing the polymer, dissolving the polymer completely in ethylene glycol monoethyl ether; b. weighing a 0.40-0.55 [mu]m filter membrane, suction filtering with the 0.40-0.55 [mu]m filter membrane, the insoluble substances being left on the membrane, and suction filtering the filter membrane until the filter membrane is dried; c. taking the filter membrane down, putting the filter membrane into a vacuum drier with a vacuum degree of 450-550 mmHg, drying for 1-1.5 hours at a room temperature, taking out the filter membrane, weighing to obtain the weight of the residual substances; and d. calculating the content of the insoluble substances in the polymer. The content of the insoluble substances in the polymer is calculated by drying and weighing under a vacuum condition at the room temperature. Instrument and equipment used in the method are easily available and low in cost and can be easily popularized.

The invention discloses a method for detecting the content of methylene blue in blood plasma. The method comprises the following steps of: (a) adding carboxymethyl-beta-cyclodextrin saturated solution into blank blood plasma, enabling the concentration of the mixed solution to reach 1-4.5mmol/L and maintaining the constant volume to obtain a blood plasma blank sample; (b) adding quantitative methylene blue solution into the blank blood plasma and adding the carboxymethyl-beta-cyclodextrin saturated solution to obtain a standard blood plasma sample containing the methylene blue with the concentration of Cs; and (c) adding the carboxymethyl-beta-cyclodextrin saturated solution in a blood plasma sample containing the methylene blue to obtain a blood plasma to-be-measured sample containing the methylene blue with the concentration of Cs; detecting the strength or the area of a fluorescence peak of the sample; and then calculating according to a reference substance comparison method to obtain the concentration Cs of the methylene blue in the blood plasma to-be-measured sample. According to the method disclosed by the invention, the lowest detectable limit is 0.012mumol/L and the unexpected effect is obtained.

The invention discloses a method using a single point adsorption method to measure the specific surface area of atmospheric particulates. The single point adsorption method utilizes a methylene blue water solution and comprises the following steps: (1) collecting atmospheric particulates, cutting, and weighing; (2) preparing a diluted original solution of methylene blue and a standard solution, determining the absorbance of standard solution, and drawing a work curve; (3) determining the absorbance of methylene blue solution, and calculating the adsorption amount of methylene blue according to the work curve; (4) calculating the specific surface area of atmospheric particulates. The method is simple, feasible, fast, and convenient, is suitable for measuring the surface area of atmospheric particulates, and has the characteristics of simple technology, low cost, strong operability, and low instrument requirements.

The invention discloses a method for measuring bacitracin and the content of the preparation thereof by the turbidity method, and the method contains the following steps: the preparation of standard solution, the preparation of test solution, the preparation of test organism suspension, the content measurement, etc. The antibiotics-microbial test and multi-dose turbidity method of the invention are adopted for measuring the bacitracin and the content of the preparation thereof, thus the test method is accurate and effective and has low cost, and test results can truly reflect antibacterial activity of the bacitracin and the preparation thereof; the method has stronger practicality and operability in the production and the quality control of the drug and the preparation thereof.