9results about How to "Wide concentration range" patented technology

The invention discloses an anti-resonance hollow-core waveguide photo-thermal spectrum gas sensor, and relates to an optical gas sensor. The laser comprises pump laser (1), detection laser (2), an input optical fiber (3), a hollow-core anti-resonance optical fiber (4), an output optical fiber (5) and a photoelectric detector (6), the pump laser (1) and the detection laser (2) are combined through a coupler and are coupled to an air core of the hollow-core anti-resonance optical fiber (4) through the input optical fiber (3); the input optical fiber (3), the hollow-core anti-resonance optical fiber (4), the output optical fiber (5) and the photoelectric detector (6) are connected in sequence; and the hollow-core anti-resonance optical fiber (4) comprises a waveguide gas chamber (4-0), a gas inlet (4-1) and a gas outlet (4-2). The optical phase demodulation is realized by utilizing an anti-resonance reflected light waveguide mechanism, an external interference phase demodulation structure is not needed, the system is simple, the cost is low, and the response speed is high.

The utility model relates to gas detection technical field, the utility model provides a kind of portable gas calibration device, can realize portable flow adjustable, gas species selectable, configuration accurate, simple operation and safe use. The utility model device can produce five kinds of standard gas in hydrogen in air, hydrogen in oxygen, hydrogen in nitrogen, oxygen in hydrogen and oxygen in nitrogen, when producing hydrogen in air, can not use standard gas cylinder, by extracting field air after pretreatment as carrier gas to carry out gas distribution;When producing other gas, only need to be equipped with a bottle of carrier gas standard gas. The utility model gas distribution principle is simple, concentration is accurate, greatly facilitates the calibration of on-site analyzer, realizes portable flow adjustable, gas species selectable, configuration accurate, simple operation.

The invention relates to the technical field of environmental chemistry, and particularly discloses a method for degrading PCB118 in soil by activating sodium persulfate with modified nano-iron, which comprises the following process steps: preparing a contaminated soil sample; preparing a plant extracting solution; preparing environment-friendly modified nano iron; establishing a degradation reaction method of PCB118 in the soil; extracting and purifying PCB118 in the soil; measuring by using PCB118 (printed circuit board 118); the degradation rate of PCB118 is calculated; ginkgo tree leaves which are common in south and north in China are adopted as raw materials to prepare an extracting solution, a green synthesis method is adopted to prepare nano-iron, a carboxymethyl cellulose modified nano-iron material is adopted, the prepared CMC (at) G-nZVI composite material is utilized to activate sodium persulfate to degrade pentachlorobiphenyl PCB118 in soil, a degradation reaction method for PCB118 in soil is established, operation is carried out according to the method, and the method has the advantages that the effect of degrading PCB118 in soil is achieved. The degradation rate of the PCB118 in the soil is 68.7%-70.5%, the pollution of the pentachlorobiphenyl PCB118 with high chlorine content in the soil is effectively reduced, and the harm of the pentachlorobiphenyl PCB118 to the ecological environment and human health is reduced.

The invention relates to the technical field of impurity detection, and discloses a method for determining impurity elements in hafnium oxide, which comprises the following steps: S1, preparing a hafnium oxide sample solution to be detected; s2, establishing a standard curve of each impurity element to be detected; s3, determining the detection precision of the instrument; s4, verifying the accuracy of the test result and the stability of the test method; and S5, respectively calculating the concentration of each impurity element to be detected in the hafnium oxide sample according to the signal intensity of each impurity element to be detected and the corresponding standard curve. According to the technical scheme, the defects of the existing detection technology in the aspect of detection of impurity elements B, P and U in hafnium oxide can be overcome, and high-accuracy detection of the impurity elements B, P and U in hafnium oxide is realized.

Provided are a uricase activator and a uricase activation method which are capable of highly activating uricase. Also provided are a uric acid measurement reagent and a uric acid measurement method which have a wide measurable concentration range. Further provided are a uricase activator comprising hydroxyisourate hydrolase, and a uric acid measurement reagent for use in measuring a uric acid concentration in a sample collected from a living body, comprising uricase and hydroxyisourate.

The utility model discloses an integrated efficient waste gas purification device which comprises an auxiliary burner, an oxidizing chamber and a preheating chamber, the oxidizing chamber is in a thermos bottle shape and is formed by connecting a small straight pipe section, a taper pipe section and a large straight pipe section, the front end of the small straight pipe section is connected with an auxiliary burner for controlling the temperature in the oxidizing chamber to rise, the rear end of the large straight pipe section is connected with a preheating chamber for preheating organic waste gas, and a gas distribution chamber is sleeved at the taper pipe section and is communicated with the preheating chamber. A plurality of circles of waste gas nozzles for tangentially feeding high-temperature waste gas in the gas distribution chamber into the oxidation chamber are arranged on the taper pipe section; an air inlet is formed above the preheating chamber, a flue gas outlet is formed in the right end face, and a high-temperature waste gas channel for feeding high-temperature waste gas into the communicated gas distribution chamber is formed in the left end face of the preheating chamber. Waste gas is preheated through the preheating chamber, smoke is cooled, and the temperature of the oxidizing chamber is regulated and controlled through the auxiliary combustor. The device is simple in structure, wide in applicable waste gas concentration range, high in waste gas purification efficiency, low in investment and operation cost, safe, reliable, efficient and energy-saving.

The present invention discloses a high-throughput and high-sensitivity qualitative and quantitative analysis method for organic components of solid samples. The present invention adopts a non-targeted method of direct thermal desorption technology of the injection port of a gas chromatograph, which does not require pre-treatment, has little blank interference, is simple to operate, has good parallelism, and greatly shortens the time and manpower required for the sample extraction process; the present invention combines a gas chromatography-time-of-flight mass spectrometer, and only requires about 1 microgram of sample to complete sample detection, greatly reducing the sample loss rate; the detection species has a high flux and a wide concentration range, breaking through the limitations of existing scientific cognition, and can systematically identify and quantify more than 1,500 organic species, including aromatic oxygen-containing substances, aromatic nitrogen-containing substances, chain alkane substances and benzene series, etc., to achieve all potential organic species. Qualitative and quantitative non-targeted analysis, thereby improving the detection ability of samples.

The invention provides an infrared spectrum-based heavy water concentration online analysis method and system, and relates to the technical field of heavy water concentration measurement. The method comprises the following steps: acquiring an absorption spectral line formed after an infrared beam passes through a target solution, and determining concentration information of a detected liquid based on the absorption spectral line; four adjacent spectral line segments are selected from an absorption spectrum, four adjacent spectral line areas, namely a first spectral line area, a second spectral line area, a third spectral line area and a fourth spectral line area, are determined on the basis of the four spectral line segments, and if corresponding concentration values in concentration information belong to high-range concentration monitoring, middle-range concentration monitoring and low-range concentration monitoring, the concentration information can be monitored. Each measuring range corresponds to each spectral line region and each model function; and determining the concentration of the detected liquid according to the corresponding model function and the absorbance intensity of the corresponding spectral line region. According to the method, different spectral line regions and model functions are selected to adapt to the concentrations of high, medium and low ranges, and the concentration monitoring accuracy is improved.

The invention belongs to the technical field of plant grafting, and particularly relates to an early identification method for healing degree and affinity of fruit tree grafted rootstocks and scions. The early identification method comprises the following steps: grafting a scion to a stock, culturing for 10-20 days, inserting the base part of the stock into a fast green staining solution for staining, and judging the healing degree and affinity according to the staining condition. Different rootstock and scion combinations after grafting are dyed by using the dyeing agent fast green, the transportation difference of the fast green in the grafted rootstock and scion combinations is analyzed, the rootstock and scion healing degree and affinity can be rapidly judged, and technical and theoretical supports are provided for rapid rootstock breeding, rootstock and scion combination screening and rootstock application.