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How good is Thermo Fisher Fisher Ion Chromatography compared to photometry and atomic absorption method?
Time of Update: 2022-09-30
Applications range from the analysis of anions, cations and organic acids commonly found in water to the analysis of polar compounds, amino acids, sugars, heavy and transition metals and different oxidation states.
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Sun Yang's group from Shanghai Jiaotong University predicts a new mode of collective motion of atomic nuclei
Time of Update: 2022-08-16
Recently, the research group of Professor Sun Yang from the School of Physics and Astronomy, Shanghai Jiao Tong University, in cooperation with colleagues from Lanzhou University and the University of Tennessee, predicted a new type of collective motion pattern of atomic nuclei.
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Determination of total chromium in soil. Flame atomic absorption spectrophotometry (1)
Time of Update: 2022-03-09
(3) Ammonium chloride aqueous solution (10%): Weigh accurately 10g of ammonium chloride (NH 4 Cl), dissolve it with a small amount of water and transfer the entire amount into a 100mL volumetric flask, dilute to the mark with water, and shake it well .
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Solid waste. Determination of lead, zinc and cadmium. Flame atomic absorption spectrophotometry (2)
Time of Update: 2022-03-09
When the white smoke is exhausted again and the contents are viscous, remove the crucible and cool it slightly, add 1 mL of nitric acid solution to warm it to dissolve the soluble residue, and then transfer the entire amount to a 25 mL volumetric flask after cooling, and rinse the crucible lid and inner wall with appropriate amount of experimental water.
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Solid waste. Determination of lead, zinc and cadmium. Flame atomic absorption spectrophotometry (3)
Time of Update: 2022-03-09
According to the reference conditions of the instrument, after adjusting the zero point of the instrument with nitric acid solution, inhale the standard series from low mass concentration to high mass concentration, measure the corresponding absorbance, and use the corresponding absorbance as the ordinate and the mass concentration of the lead standard series as the abscissa to establish lead Calibration curve .
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Determination of total chromium in soil. Flame atomic absorption spectrophotometry (2)
Time of Update: 2022-03-09
2000g sample in a microwave digestion tank, wet it with a small amount of water, add 6mL nitric acid, 2mL hydrofluoric acid , digest according to a certain temperature program, after cooling, transfer the solution into a 50mL PTFE crucible, add 2mL perchloric acid, the temperature of the electric heating plate is controlled at 150℃, to drive away the white smoke and steam until the content is viscous .
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Solid waste. Determination of lead and cadmium. Graphite furnace atomic absorption spectrophotometry (1)
Time of Update: 2022-03-08
0001g) of metallic lead, add 15mL of nitric acid to dissolve, if necessary, heat to dissolve, transfer the entire amount into a 1000mL volumetric flask, dilute to the mark with nitric acid solution, shake well; or use a commercially available one Certificate standard solution .
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Solid waste. Determination of lead, zinc and cadmium. Flame atomic absorption spectrophotometry (1)
Time of Update: 2022-03-08
00mL each of the lead, zinc, and cadmium standard stock solutions into a 100mL volumetric flask, dilute to the mark with a nitric acid solution, and shake well .
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Solid waste. Determination of lead and cadmium. Graphite furnace atomic absorption spectrophotometry (2)
Time of Update: 2022-03-08
When the white smoke is exhausted again and the contents are viscous, remove the crucible and cool it slightly, add 1 mL of nitric acid solution to warm to dissolve the soluble residue, and transfer the entire amount to a 25 mL volumetric flask after cooling, and rinse the crucible lid and inner wall with appropriate amount of experimental water.
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Solid waste. Determination of lead and cadmium. Graphite furnace atomic absorption spectrophotometry (3)
Time of Update: 2022-03-08
According to the reference conditions of the instrument, after adjusting the zero point of the instrument with nitric acid solution, inhale the standard series from low mass concentration to high mass concentration successively, measure the corresponding absorbance, and use the corresponding absorbance as the ordinate and the mass concentration of the cadmium standard series as the abscissa to establish the pot Calibration curve .
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Soil and sediment mercury, arsenic, selenium, bismuth, and antimony atomic fluorescence method (1)
Time of Update: 2022-02-27
(1) Scope of applicationMicrowave digestion/atomic fluorescence method is suitable for determining the content of mercury, arsenic, selenium, bismuth and antimony in soil and sediment .
(2) Method principleAfter the sample is digested by microwave, the test solution enters the atomic fluorescence photometer.
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Soil and sediment mercury, arsenic, selenium, bismuth, and antimony atomic fluorescence method (2)
Time of Update: 2022-02-27
Take a certain amount of arsenic and antimony supernatant in a colorimetric tube, add 10% hydrochloric acid, 100g/L thiourea solution, dilute to the mark with pure water, shake well, place at room temperature for 30 minutes, and measure on an atomic fluorescence photometer For the fluorescence intensity of arsenic and antimony, find out the corresponding mass concentration of arsenic and antimony from the standard curve .
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What few people know: The propellant for China’s first atomic bomb was produced in a pesticide and fertilizer plant
Time of Update: 2022-02-17
The ghost knows that in the final outcome, China really produced the propellant raw materials, and it was in the fertilizer plant, and the atomic bomb was successfully detonated .
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Line-scanning high-speed atomic force microscopy captures rapid displacement of single molecules
Time of Update: 2022-02-16
10 in the journal Nature Communications, describes a technique the researchers developed called line-scanning speed atomic force microscopy, It captures the movement of bacteriorhodopsin in response to light on a millisecond time scale .
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JCEM: What is the prevalence of diabetes among atomic bomb survivors?
Time of Update: 2022-01-23
Recent epidemiological studies have shown that survivors of childhood cancer who receive high therapeutic doses of radiation have an increased risk of developing diabetes, especially systemic or abdominal cancer .
Radiation dose was significantly associated with diabetes incidence, an effect that varied with age in city and ATB .