A serum containing sodium Na + gives a signal of 3.09 mV in an atomic emission analysis. Then 4.00 mL of a 1.08 M solution of a standard NaCl solution is added to 96.0 mL. This fortified sample gives a signal of 7.99 mV. Find the original concentration of Na +.
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- In a clinical analysis laboratory, the level of sodium in the blood is determined by atomic emission spectrometry. The method uses lithium as an internal standard, since the sample treatment is very complex and can cause ion losses. Also, the lithium signal does not interfere with that of sodium. The table below shows the results obtained after measuring different sodium standards to which a constant concentration of lithium (100 mM) has been added. Na concentration (mM) Na signal (UA) Li signal (UA) 0 0 0,180 20 0,036 0,220 50 0,066 0,160 100 0,125 0,190 150 0,200 0,210 200 0,315 0,250 a) Calculate the calibration line corresponding to the internal standard method. b) A blood sample was analyzed with said method and the following signals were obtained: 0.197 AU for sodium and 0.23 AU for lithium. What was the sodium concentration of the tested blood?To determine the content of Pb in a canned sausage, 5.00 g were weighed and after adequate treatment they were gauged to a volume of 100 mL, from there an aliquot of 2 mL was taken and brought to a volume of 250 mL. The readings of a series and of the sample were taken in an Atomic Absorption spectrophotometer, recording the following data: mg Pb/mL 0 1 2 3 4 Sample Absorbance 0.00 0.15 0.29 0.44 0.58 0.38 What is the% Pb in canned sausage?Standard addition. A blood serum sample containing Na gave an emission signal of 4.27 mV. A small volume of concentrated standard Na was then added to increase the Na concentration by 0.104 M, without significantly diluting the sample. This “spiked” serum sample gave a signal of 7.98 mV in atomic emission. Find the original concentration of Na in the serum.
- What are the differences between a mass spectrometer and a IR spectrometer?The mass spectrum of Copper is shown Which species could be responsible for the peak at m/z 32.5?A mass spectrum with M+ at m/z = 101 with a minor M+1 peak contains what diagnostic atom? I believe the substance talked about may be C6H15N but I am not sure. Please explain.
- Where can I know the spectral properties of my sample? UV vis spectro, fluorescence spectro, Portable NIRmass of copper = 2.494g; Wavelength = 830.6 Volume of volumetric flask - 50 ml Here's the absorbance of all the test tubeWhich of the following will give a negative deviation to Beers Law? I. polychromatic radiation II. presence of stray light III. presence of particulates on the sample A. I and II only B. II and III only C. I and III only D. I only
- Seven replicate measurements of a sample containing 2.00 ng of Hg per liter gave readings of 188, 248, 194, 212, 203, 240, and 214 in an atomic emission experiment. d) Estimate the detection limit of this methodA solution prepared by dissolving 25.8 mg of benzene (78.11 g/mol) in hexane (86.16 g/mol) and diluting to 250 mL had an absorption peak at 256 nm and an absorbance of 0.266 in a 1.000-cm cell. If a sample of hexane with benzene had an absorbance of 0.153 at 256 nm in a cuvette with 1.000-cm path length, find the concentration of benzene in molarity. A. 1.51×10-4 M B. 7.59×10-4 M C. 5.41×10-4 M D. 6.69×10-4 MA 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?
