11 results about "Atomic fluorescence spectrometry" patented technology

The invention provides a method for rapidly detecting wastewater pollutants by atomic fluorescence spectrometry, and belongs to the technical field of wastewater treatment.The method comprises the steps that atomic fluorescence spectrum data of a wastewater sample are collected to establish a spectrum interference matrix to characterize the spectral line overlapping condition between elements; abnormal values are recognized through statistical analysis, a spectrum outlier matrix is built, abnormal fluorescence intensity distribution is recorded, sample matrix non-characteristic fluorescence signals are measured, a background fluorescence interference matrix is built, background interference intensity is quantized, system signal change rules are continuously monitored and detected, and a signal drift tendency matrix is built to predict the signal drift tendency. A spectrum interference matrix and a background fluorescence interference matrix are processed through a spectrum analytic function, compensation factors are calculated, spectrum overlapping and background interference influences are corrected, system drift is corrected in real time, and a final wastewater pollutant concentration detection result is output, so that the technical problem of unstable detection precision caused by coupling of multiple interference factors is solved.

The invention discloses an efficient and safe microwave digestion-atomic fluorescence detection method for total selenium in soil, and belongs to the technical field of analytical chemistry and environmental detection.According to the method, the content of total selenium in selenium-rich soil is rapidly, accurately and safely measured by optimizing the sample weighing amount, the microwave digestion procedure and the detection conditions, and the detection accuracy is improved. The method comprises the following specific steps: weighing 0.1 g of an air-dried and sieved selenium-rich soil sample, adding 5mL of concentrated nitric acid, then carrying out a microwave digestion process of heating to 175 DEG C for 12 minutes and maintaining for 48 minutes, after digestion, adding 5mL of 6mol / L hydrochloric acid, carrying out acid removal reduction at 140 DEG C, fixing the volume to 15mL by using 5% diluted hydrochloric acid, and finally determining by using an atomic fluorescence spectrophotometer by using 5% hydrochloric acid as a carrier current and 1% potassium borohydride and 0.5% potassium hydroxide as reducing agents. According to the method, the use of dangerous reagents such as hydrofluoric acid and perchloric acid is avoided, the detection period is remarkably shortened, the linear range is 0-10 mu g / L, and the correlation coefficient is Rgt; the average recovery rate is up to 101.13%-101.51%, and the precision is RSDlt (Research Standard Defect); the requirements of rapid detection of the total selenium content of the selenium-rich soil, agricultural production and environmental evaluation are met.

The application provides a monovalent mercury detection method, and relates to the field of analytical detection technology. The monovalent mercury in a to-be-detected sample is extracted by 2-mercaptoethanol aqueous solution, and the obtained to-be-detected sample liquid is subjected to high performance liquid chromatography-atomic fluorescence spectrometry detection. In the high performance liquid chromatography separation process, the monovalent mercury is completely disproportionated into zero-valent mercury and divalent mercury, and is separated by high performance liquid chromatography, and is subjected to atomic fluorescence spectrometry detection respectively. The mercury of all valence states is reduced by a reducing agent and forms mercury vapor, and then generates a fluorescence signal, and sequentially peaks with a retention time, so that the zero-valent mercury detection peak area and the divalent mercury detection peak area are obtained. According to the zero-valent mercury detection peak area and the divalent mercury detection peak area, the detection concentration of divalent mercury and the detection concentration of zero-valent mercury are obtained by using an external standard method. The concentration of monovalent mercury in the to-be-detected sample liquid is calculated, the accuracy and the sensitivity of detection are high, and efficient analysis and detection of monovalent mercury are realized.

The invention belongs to the field of chemical analysis of spectrometry, and particularly relates to a method for detecting mercury content in copper slag concentrate by atomic fluorescence spectrometry. The method comprises the following specific steps: fully dissolving a copper slag concentrate sample to be measured by hydrochloric acid, nitric acid and ammonium bifluoride, and introducing generated mercury atom steam into an atomic fluorescence spectrometer for measurement in a (3 + 97) nitric acid medium by taking stannous chloride as a reducing agent and argon as carrier gas. The method has the characteristics of low detection lower limit, wide measurement range, high accuracy, good precision, strong practicability and the like.

The invention relates to a lake water body heavy metal pollution risk assessment method based on a multi-source analytical model, and the method comprises the following steps: S1, sample collection: collecting lake water body samples by using a water collector in a dry season and a wet season respectively, carrying out membrane treatment on the samples through a microporous filter membrane, and removing suspended matters in the samples to obtain a water sample to be detected; s2, sample detection: pretreating a water sample to be detected, determining the concentrations of Pb, Cu, Zn, Co, As, Cd, Cr, Mn and Ni in the water sample by using ICP-MS (Inductively Coupled Plasma Mass Spectrometry), and determining the concentration of Hg in the sample by using atomic fluorescence spectrometry; and S3, heavy metal spatial distribution characteristics: analyzing the heavy metal spatial distribution characteristics based on inverse distance weighted interpolation in Arc-Gis. According to the method, the double-stage sampling design of the dry season and the wet season is combined, the spatial and temporal distribution characteristics of the heavy metals under different hydrological conditions can be comprehensively reflected, the limitation of a single-index evaluation method is made up, and the method is high in adaptability and suitable for preliminary diagnosis of heavy metal risks of various water bodies.

The utility model relates to the technical field of detection devices, in particular to a microwave digestion device for measuring organic selenium in animals by an atomic fluorescence method, which comprises a box body, the box body comprises a depressurization chamber and a digestion chamber, the depressurization chamber is separated from the digestion chamber through a partition plate, and a vacuum negative pressure pump is mounted in the depressurization chamber. A controller is arranged in the depressurization chamber, a touch screen is arranged at the front end of the depressurization chamber, the controller is in two-way signal connection with the touch screen, a microwave source is arranged at the top of the digestion chamber, a test tube tray is mounted at the bottom of the digestion chamber, and a chamber door is rotatably mounted at the front end of the digestion chamber; a door groove clamped with the chamber door is formed in the front end of the digestion chamber, a sealing ring groove is formed in the front end surface of the door groove, and a sealing ring is clamped in the sealing ring groove. According to the device disclosed by the utility model, the boiling point of a substance is reduced through uniform heating and a negative pressure environment provided by the microwave source, so that the digestion process can be carried out at a lower temperature, and the digestion efficiency of an animal sample is improved when organic selenium in an animal is measured by an atomic fluorescence method.

The invention provides a method for detecting mercury ions in wastewater, which comprises the following steps of: preparing a detection solution by taking a carbon quantum dot material as a detection reagent, mixing the detection solution with mercury ion solutions with different volumes to prepare a standard detection solution with gradient concentration, performing fluorescence test on the standard detection solution with gradient concentration, drawing a standard curve, and determining the mercury ions in the wastewater according to the standard curve. Mixing the detection solution with to-be-detected wastewater, detecting the absorbance of the to-be-detected wastewater, and calculating the concentration of mercury ions in the to-be-detected wastewater by using the standard curve. According to the method disclosed by the invention, detection can be completed by taking the quantum dots as an auxiliary detection reagent and adopting a fluorospectro photometer, so that the use of expensive detection equipment in inductively coupled plasma mass spectrometry and atomic fluorescence spectrometry is avoided, the detection cost can be effectively reduced, and the method also has the advantages of easiness in operation and high applicability.

The application provides a method for rapidly detecting wastewater pollutants by atomic fluorescence spectrometry, and belongs to the technical field of wastewater treatment.The atomic fluorescence spectrometric data of wastewater samples are collected to establish a spectral interference matrix to represent the spectral line overlap between elements, abnormal values are identified through statistical analysis to construct a spectral outlier matrix to record abnormal fluorescence intensity distribution, a non-characteristic fluorescence signal of a sample matrix is measured to establish a background fluorescence interference matrix to quantify background interference intensity, signal change rules of a detection system are continuously monitored to construct a signal drift tendency matrix to predict signal shift trends, a spectral analysis function is used to process the spectral interference matrix and the background fluorescence interference matrix to calculate a compensation factor to correct the influence of spectral overlap and background interference and to real-time correct system drift to output a final wastewater pollutant concentration detection result, and the technical problem of unstable detection precision caused by multiple interference factors coupling is solved.

This invention relates to the field of liquid phase chemistry, specifically to a method for determining mercury and arsenic in coal briquettes based on hydrothermal synthesis reactor digestion and atomic fluorescence spectrometry. The method involves adding a certain amount of coal briquettes and an appropriate amount of mixed acid to a pre-treated polytetrafluoroethylene (PTFE) sealed container (pre-treated by soaking, washing, and preheating) for pre-digestion until gas release occurs. After the reaction slows down, the container is covered, placed in a stainless steel sleeve, sealed, and placed in an electrically heated drying oven for sealed heating digestion. Then, acid removal and volume adjustment are performed to obtain the test solution. A series of standard solutions for mercury and arsenic are prepared, and a standard curve is plotted. The obtained digested solution is then tested using an atomic fluorescence spectrometer to obtain the fluorescence intensity. The content of the corresponding elements in the coal briquettes is calculated using the standard curve. This invention can accurately measure the content of volatile trace elements, such as mercury and arsenic, in coal briquettes.

The invention discloses a planting method for improving the selenium content of tartary buckwheat grains, and particularly relates to the field of agricultural planting, the method comprises the following steps: selecting a tartary buckwheat variety in a tartary buckwheat main producing area; determining a proper selenium application period; setting a selenium source and selenium application amount; leaf surface spraying is conducted on plant leaves; and after the tartary buckwheat seeds are mature, determining the selenium content of the seeds by using a hydride atomic fluorescence spectrometry. On the premise of ensuring food safety, the selenium content of the tartary buckwheat grains is increased, and the yield is considered.

The invention discloses a method for simultaneously determining the content of bismuth and selenium in electric nickel, and particularly relates to the technical field of metal trace element determination.The method comprises the steps of preparing a sample solution, preparing a calibration solution, measuring the concentration of bismuth and selenium in the sample solution and the like, and calculating the measurement result to obtain the content of bismuth and selenium. According to the method, the hydride generation-atomic fluorescence spectrometry is adopted for simultaneously and directly determining the bismuth and the selenium in the electric nickel, when the sample solution is prepared, the ferric chloride solution and the citric acid mixed solution better inhibit nickel interference, separation and enrichment of a nickel matrix are not needed, the bismuth and the selenium in the electric nickel can be directly and simultaneously determined, operation is easy, sensitivity is high, accuracy is high, and the method is suitable for large-scale popularization and application. The relative standard deviation of sample determination is low, and the sample adding standard recovery rate is high.