Which of two instrumental modes, atomic absorption or atomic emission, results in the better detection of metal ions in general? Describe the processes that can analyte solution goes through during atomization in the graphite furnace?
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- Which of two instrumental modes, atomic absorption or atomic emission, results in the better detection of metal ions in general?
- Describe the processes that can analyte solution goes through during atomization in the graphite furnace?
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- How do solvent, temperature, and pH affect fluorescence of fluorophore?The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…
- A student mixed 5.00mL of 0.0020M Fe(NO3)3, 3.00mL of 0.0020M KSCN, and 3.00mL of distilled water. The mixture reacted to form a reddish solution indicating that FeSCN2+ was formed, according to the equation below. An absorbance of 0.21 was measured for this solution in a Spectrophotometer set at a wavelength of 447nm. Fe³+ (aq) + SCN (aq) FeSCN2+ (aq) A calibration curve was used to find the equilibrium concentration of the product of this reaction: y = 1895x + 0.027 Calculate the equilibrium concentration of the Fe³+ Report your answer to 4 sig figsWhich atomic spectroscopy is a more preferred method in the analysis of trace levels (such as ppb levels) of iron and calcium in a food sample? Briefly explain your answer.Describe the application of AAS (Atomic Absorption Spectrophotometry) analytical methods for gold, copper and iron ore deposit evaluation which involve surface and subsurface geochemical sampling in a tropical environment.
- What is the significance of whether the fluorescent substance in fluorescent tubes has a short or long phosphorescence?Atomic Spectroscopy (a) In terms of spectral shape, how are atomic spectra different from molecular spectra? What is the source of this difference? (b) Describe the decision-making process for picking a line for atomic emission analysis of a given analyte. (c) For quality assurance, spike recovery is not sufficient to establish confidence in an analytical procedure. Explain this statement. What should be done instead to demonstrate satisfactory performance of an instrumental method (including elemental analysis). (d) Find a literature example of atomic spectroscopy used for elemental analysis. State the operating conditions with sufficient detail to reproduce the analysis; Please answer very soon will give rating surely All questions complete Answer needed Please help meExplain (with the aid of one or more equations) why a LOWER selectivity coefficient for an interfering ion means an ISE is actually MORE selective for the target ion.
- Photobromination of cinnamic acid to dibromocinnamic acid was carried out in blue light of wavelength 440nm at 35degree celsius using light intensity of 1.5 *10 power -3 joule per second. An exposure of 20 minutes produces a decrease of 0.075 millimoles of bromine. The solution absorb 80% of light passing through it. Calculate the quantum yield of the reaction.5 What is the atomic number of a neutral atom that has 8 neutrons and 7 electrons? a. 15b. 8c. 7d. 1 6 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solidA calibration curve is made for the absorbance as a function of concentration of blue dye (in mg/L). The slope of the curve is 0.131; the y-intercept is -0.01869; the correlation is 0.993. If a consumer sample has an absorbance of 0.120 on the same instrument, what is its concentration of blue dye, in mg/L? a. 0.034 b. 0.935 c. 0.993 d. 1.06