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…
- 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.Which 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.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 figs
- What is the significance of whether the fluorescent substance in fluorescent tubes has a short or long phosphorescence?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.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 me
- Explain (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.Assume for the following situations that Beer’s law remains linear. For (a) and (b), indicate whether the extinction coefficient ε, path length b, or concentration C is changing, and how it will change the absorbance of the solution. (a) A sample is moved from a test tube that is 1.0cm wide to a test tube that is 1.5cm wide. (b) A sample is diluted by adding enough solvent to double its volume. (c) A solution of iron (III) chloride appears brown when in high enough concentrations. In a 1.0 cm cuvet, the absorbance of 334 nm light by a 5.4 × 10−4 M solution of FeCl3 is measured to be 1.05. What is the extinction coefficient of the FeCl3 complex at this wavelength? (d) A sample containing an unknown concentration of FeCl3 is measured to have an ab- sorbance of 0.43 at 334 nm in a 1.0 cm cuvet. What is the molar concentration of the solution?A 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
