11 results about "Mercury level" patented technology

The invention relates to a mercury content detection method, and relates to the technical field of mercury detection. According to the mercury content detection method, the to-be-detected sample is preliminarily quantified by using the X-ray spectrometer, the mercury content range of the to-be-detected sample can be quickly obtained, the to-be-detected sample is weighed according to the preliminarily measured mercury content, and the accuracy and reliability of subsequent detection can be guaranteed. By means of constant-temperature water bath heating, it can be guaranteed that a sample to be detected is completely decomposed, meanwhile, a solution in the cover type funnel is poured back into the conical flask, mercury compounds volatilized after heating can be collected, mercury content loss is avoided, and the stability and accuracy of subsequent detection results are further guaranteed. The mercury standard solution is prepared, the inductively coupled plasma emission spectrometer is used for detection, manual titration operation is not needed, the anti-interference capability is good, the mercury content can be accurately measured, and the stability and accuracy of a detection result are effectively guaranteed.

The invention discloses a method for detecting mercury content in cordyceps sinensis, which comprises the following steps: taking cordyceps sinensis powder, pre-treating by adopting a microwave digestion instrument, and then detecting by adopting an inductively coupled plasma mass spectrometer. The test conditions of the inductively coupled plasma mass spectrometer are as follows: the mass numbers of mercury are selected to be 201 Hg and 202 Hg, the mass numbers of chromium, iron, nickel and tungsten are selected to be 52 Cr, 56 Fe, 60 Ni and 186 W, internal standards are selected to be 45 Sc, 72 Ge, 115 In and 209 Bi, an interpolation mode is adopted, and instrument determination is selected to be a KED collision mode. The method can effectively avoid false positive of the mercury test in the cordyceps sinensis, can accurately and reliably evaluate the quality of the cordyceps sinensis to prevent misjudgment, can cope with the specific doping problem of the cordyceps sinensis, and can also be applied to optimization of crushing equipment and crushing time in the crushing process.

The invention relates to the field of spectral absorption analysis, and provides an analysis method for determining mercury in basic cupric carbonate through hydrochloric acid dissolution, which comprises the following steps: dissolving basic cupric carbonate at low temperature by using hydrochloric acid without reducibility, steaming to 2-3mL, oxidizing mercury in a sample into high-valence mercury by using potassium permanganate, and determining the mercury content in the sample by using hydrochloric acid without reducibility. And completely reducing mercury in the sample into mercury vapor by using stannous chloride, and measuring the mercury content on a cold atomic absorption spectrometer. At present, a standard analysis method for mercury elements in materials such as basic cupric carbonate is lacked in China. Mercury is a harmful substance in the nature, and it is particularly important to analyze whether mercury can be accurately analyzed. The method is improved on the basis of a conventional analysis processing method, adopts single hydrochloric acid to dissolve the sample, and has the characteristics of high measurement precision, wide range, high accuracy, strong practicability and the like.

The invention discloses a quantitative mercury gas enrichment device capable of reducing sampling temperature and pressure and a mercury detection method thereof, and belongs to the technical field of environment detection. The quantitative mercury gas enrichment device comprises a sampling container, a pretreatment instrument, a sample gas temperature and pressure instrument, an argon gas temperature and pressure instrument, a mercury gas enrichment device, a miniature vacuum pump and a tail gas purifier, and the sample gas temperature and pressure instrument is used for reducing the temperature and the air pressure of a sample gas sampling environment so as to accurately determine the sample injection volume at the temperature and the air pressure; meanwhile, the mercury gas enrichment device is filled and preheated by utilizing an argon gas temperature and pressure meter, so that the temperature and pressure changes in the sample gas inlet process are reduced, and the accuracy of the sample injection volume and the sample injection stability are further ensured; in the mercury gas enrichment process, argon is used for carrying the sample gas for circulating enrichment, the mercury gas in the sample gas is fully absorbed, the subsequent mercury detection precision is improved, the accuracy and the stability of a detection result are greatly improved, and the real condition of the mercury content in a sampling environment can be more accurately analyzed.

The application discloses a method for quantitatively analyzing mercury in different occurrence states in sedimentary rocks, belongs to the technical field of geological rock analysis, extracts kerogen from whole rock, respectively determines the mercury content and the organic carbon content of the whole rock and the kerogen, then carries out high-temperature thermal desorption analysis on equal quality of the two, obtains a thermal desorption curve, divides the release stages of different mercury occurrence states according to the thermal desorption curve, and calculates the content and proportion of mercury in each stage, and finally combines the total mercury content of the whole rock, the mercury content of the kerogen and the mass ratio, and obtains the inorganic mercury content through mass balance calculation. The method divides mercury into organic matter combined state (in kerogen) and inorganic combined state through physical separation and high-temperature pyrolysis, overcomes the multi-solution problem of traditional correlation fitting, significantly improves the accuracy and reliability of mercury as a volcanic activity tracer, and verifies the experimental data through mass balance calculation, avoiding the misjudgment of a single fitting method.

The application discloses a kind of determination early warning method, system and storage medium of mercury content in food raw materials, it is related to food safety detection technical field, comprising: obtaining the surface enhanced Raman spectrum of food raw material sample, and pretreatment and data enhancement, extract the spectral feature of enhanced Raman spectrum data, optimally generate spectrum feature with the best spectral feature combination, extract feature parameter combination based on spectrum feature, the data set is constructed with different concentration mercury content sample synthesis;Establish identification determination model, train using data set, collect the surface enhanced Raman spectrum of food raw material to be detected, extract spectrum feature as model input and carry out qualitative, quantitative analysis of mercury content;When quantitative analysis result in mercury content concentration is greater than preset mercury content threshold value, then generate abnormal early warning information.The application utilizes surface enhanced Raman spectrum to construct the rapid detection method of mercury content in food raw materials, improves the accuracy of mercury content determination.

This invention discloses a control system and method for reducing mercury emissions from cement kiln dust collector ash discharge. A flue gas mercury analyzer installed on the chimney measures the mercury concentration in the flue gas and transmits the data to a computer. When the mercury concentration in the flue gas is lower than the environmental standard, the dust collector ash is not discharged. When the mercury concentration in the flue gas is higher than the environmental standard, the computer controls relevant equipment to discharge the dust collector ash to reduce the mercury concentration in the chimney. Solid powder samplers installed in the ash hopper of the baghouse dust collector and on the raw material elevator take samples at regular intervals and send them to a solid mercury analyzer. The solid mercury analyzer transmits the mercury content of the dust collector ash and the mercury content of the raw material entering the kiln to the computer. By comparing the input and output mercury levels, the computer calculates the amount of dust collector ash to be discharged. The computer then controls a bidirectional screw conveyor to transport the dust collector ash to a temporary storage silo via a second belt conveyor according to the calculated discharge amount, thereby reducing the mercury emission concentration from the chimney.

The present invention provides a pollution assessment method based on XGBoost co-kriging, taking the spatial distribution prediction of heavy metal mercury pollution in soil as an example, and fully considering the influence of multiple auxiliary variables on mercury content. The present invention first adopts the XGBoost regression model to train the nonlinear relationship between each auxiliary variable and the mercury content, extracts and integrates the information of all auxiliary variables, and generates a comprehensive one-dimensional auxiliary variable. Subsequently, the comprehensive auxiliary variable is used as an auxiliary factor for co-kriging interpolation to optimize the spatial distribution prediction of soil mercury content. Compared with the co-kriging method that directly uses multiple auxiliary variables, the present invention can more effectively reduce the dimension, improve the prediction accuracy and model stability, and at the same time improve the computational efficiency, providing a highly efficient and accurate prediction method for soil pollution assessment.

The invention provides a method for extracting and detecting total mercury in food, which comprises the following steps: (1) mixing a first food raw material and an extracting solution, and carrying out solid-liquid separation to obtain a first liquid phase; (2) mixing a second oxidizing agent, a gold plating agent, a shielding agent, chloride and the first liquid phase in the step (1) to obtain a liquid phase to be detected; and (3) performing electrochemical detection on the to-be-detected liquid phase in the step (2) to obtain the mercury content in the food raw material. According to the method, the total mercury in the food can be rapidly extracted, the content of the total mercury in the food can be accurately measured by adopting an electrochemical method, the detection is rapid, the accuracy is high, and the application prospect is wide.

The application discloses a quantitative testing method for mercury in different occurrence modes in organic matter-rich sedimentary rock, and belongs to the technical field of geochemical analysis. The application divides the sample to be tested into multiple equal parallel sub-samples, performs constant temperature heating at a single temperature point in an external muffle furnace, so that the sample reaches thermodynamic equilibrium, and ensures that mercury forms corresponding to the thermal stability interval are completely released; the residual mercury content of each sub-sample is determined by using a direct mercury analyzer; based on the mass conservation relation of total mercury-residual mercury = released mercury, the mercury release amount of each temperature interval is inversely calculated through the difference value of adjacent temperature gradients, and a standardized thermal desorption curve without kinetic interference, peak distortion and tailing overlap is reconstructed.

The invention discloses a portable mercury content detection device, and relates to the field of mercury content detection. The portable mercury content detection device comprises a detector and a pretreatment unit arranged on one side of the detector, the detector detects the mercury content by measuring the light intensity weakening degree through a cold atomic absorption spectrometry, the pretreatment unit comprises a drying assembly and a flow rate adjusting assembly, and the drying assembly can adjust the content of a drying agent according to the humidity of mercury gas; the flow rate adjusting assembly adjusts the mercury steam flow rate according to the drying agent content. According to the portable mercury content detection device, by arranging the drying assembly, the number of drying agents can be adjusted according to the humidity of mercury steam, so that water vapor in the mercury steam can be effectively removed, and the influence of humidity on a detection result is avoided. Meanwhile, the flow speed adjusting assembly can correspondingly adjust the flow speed of mercury steam according to the number of the drying agents, dilution of the mercury steam is reduced, it is guaranteed that the sensitivity of the detector to the mercury steam is stable, and the detection accuracy is further improved.