The chemical shift value (δ) is measured by the ratio of shift in Hertz and the operational frequency of the spectrometer in MHz, give the equation to calculate the shift value
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The chemical shift value (δ) is measured by the ratio of shift in Hertz and the operational frequency of the spectrometer in MHz, give the equation to calculate the shift value
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- In a mass spectrometer, two beams of singly ionized isotopes of uranium 23592U and 23892U are injected with velocity 1.4*105m/s into a magnetic field of strength 0.7 T normally. Compute the distance d between the two trace lines of the isotopes after they complete one semi-circle. (Given: masses of the isotopes are m235 = 3.9*10-25 kg and m238 = 3.95*10-25) a) 1.26 cm b) 0.63 cm c) 0.32 cm d) none of these.The levels of Vitamin B1 in a sample of milk was determined using the Standard Addition method and technique of fluorescence spectroscopy. 18.0 ml of the milk sample was diluted to 20.0 ml using distilled water and then the fluorescence was measured. The resulting signal was 210 units. A spike was made by taking 18.0 ml of the same milk sample, adding 1.0 ml of a 6.0 ppm Vitamin B1 standard solution, and then diluting to 20.0 ml using distilled water. The signal of the spiked milk was 540 units. Calculate the concentration of Vitamin B1 in the original milk sample (in ppm). Report to 3 decimal places.What is frequency factor?
- A compound has the chemical formula C5H11Cl. The M+ peak should be at m/z = m/z = and an M+2 peak at m/z = and there should also be an M+1 peak at If the height of the M+ peak is 27, the height of the M+1 peak should be (specify to one place after decimal) and the height of the M+2 peak should be approximatelyA solution with a known concentration equal to 3.4 mM gave an absorbance reading of 0.820 in a spectrophotometer. Assuming that there is a linear relationship between concentration and absorbance up to a concentration of 4.0 mM, what would the absorbance reading be for a solution with a concentration 2.2 mM?7. Explain what is meant by signal in instrumental analysis.
- 3. The change in frequency produced by the Doppler shift when a sound source of frequency f is moving with velocity v toward a fixed observer is given by fv Af (u-v) and v and their uncertainties, calculate Af and its uncertainty. Which, if any, of where u is the velocity of sound. From the following values of u, f, the uncertainties make a negligible contribution to the uncertainty in Af ? u = (332 ± 8) m s1; f = (1000 ± 1) Hz; and v = (0.123 ± 0.003) m s1What is the relationship between chemical shift in hertz and operating frequency?Suppose you are analyzing mercury ions (Hg2+) in drinking water samples with atomic absorption spectroscopy. If the Hg2+ signal varies by a matrix of sample, which of the following should be used as a standard for calibration? Either cations or anions can be used if they are different from Hg2+, 0 H20 Any anions can be used if they are different from Hg2+ Any cations can be used if they are different from Hg?". Hg2+
- If two signals differ by 1.5 ppm in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?What is the effect of temperature on atomic spectroscopy?Consider a mass spectrometer used to separate the two isotopes hydrogen and deuterium. The isotope hydrogen has a proton, and deuterium has a proton and a neutron. Assume both ions have a 1+ charge and they enter the magnetic field region with a speed of 6.0 x 105m/s. Calculate the magnitude of the magnetic field that is required to give a detector placement difference of 1.5 mm as measured from the initial entry point into the spectrometer compared to when the ions leave the spectrometer. Show your work.
