5 results about "Atomic fluorescence spectrometry" patented technology

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.

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.