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- Quality assurance. Tin can be leached (dissolved) into canned foods from the tin-plated steel can. (a) For analysis by inductively coupled plasma–atomic emission, food is digested by microwave heating in a Teflon bomb (Figure 2-18) in three steps with HNO3, H2O2, and HCl. CsCl is added to the final solution at a concentration of 1 g/L. What is the purpose of the CsCl?(b) Based on the perfomance and validation methods, explain the distinctions between the two tems listed below: (1) linearity and coefficient of detemination (ii) intra-day and inter-day precision (ii) absolute recovery and relative recovery (iv) limit of detection and limit of quantification (v) selectivity and specificityWhat is laser ablation and how can it he used to sample solids for ICPMS?
- Moore 5e_C OWLV2 | Onli X Q ☆ * CE w.com/ilrn/takeAssignment/takeCovalentActivity... [Review Topics] [References] isms ots 2req Use the References to access important values if needed for this question. In a study of the conversion of methyl isonitrile to acetonitrile in the gas phase at 250 °C Visited 1 pts 2req CH3NC(g)- >CH3CN(g) 1 pts 2req the concentration of CH NC was followed as a function of time. It was found that a graph of In[CH3NC] versus time in seconds gave a 1 pts 2req straight line with a slope of -3.96x10-3 s and a y-intercept 52. 1 pts 2req Based on this plot, the reaction is v order in CH,NC and the rate constant for the reaction is 1 pts 2reg 1 pts 2reg 1 pts 2reg Submit Answer Retry Entire Group 9 more group attempts remaining Previous Next Email Instructor Save and Exit Cengage Learning | Cengage Technical Support 52% 1:41 PM 1/22/2021Briefly discuss flame ionization detectors in gas chromatography under the following headings: a) theoretical principle b) type of analyte that can be analysedI had used the E= Ecell - (RT/ nF ) InQ and got that n=2 I'm not sure what I'm doing wrong. Thanks!
- Trace amounts of rare clements are found within groundwater and are of interest to goochemists. Earopium and terbium are 30 - lanthanide-scries clements that can be measured from the intensity of their fluorescence emittcd when a solution is illuminated with ultraviolet radiation. Certain organic 25 - compounds that bind Eu(III) and Tb(IIl) enhance the cmission, and substances found in natural waters can decrease 20- the cmission. For that reason it is necessary to use standard Eu (II) additions to the sample to correct for such interference. The graph shows the result of such an cxperiment in which the 15- concentration of Eu(III) and Tb(III) was mcasured in a sample of groundwatler. The x-intercept of the Eu(III) plot is 10- -23.1 ml. and the x-intercept of the Th(III) plot is -9.91 ml. In cach case, 10.00 ml. of the sample solution and 15.00 ml. 5- Tb (III) of an organic additive were added to a scries of live 50 ml. volumctric flasks. The standard Eu(lI) or Th(III) solution (0,…NAME: LAB SECTION: EXPERIMENT 21: Spectroscopy of Dyes POSTLAB EXERCISE 1. AUV/V is a spectrometer used to measure the absorbance of a solution of hemoglobin bound to oxy- gen at 590 nm. The molar absorptivity was determined to be 8.57 × 104 M-'cm-. The cuvette used had a 1.00-cm sample pathlength. The measured absorbance was ), 140. What was the concentra- tion of hemoglobin in the solution? 2. What would be the absorbance of the solution in question 1 if the pathlength were 2.00 cm? nohntooote 196Noncontact AFM images for the HBC, or Hexa-peri-hexabenzocoronene molecule. (a) Stick model. (b) Constant-height AFM measurements for an HBC molecule on a Cu (111) surface substrate. (c) A pseudo-three-dimensional representation that highlights the local maxima. (d) Calculated electron density above the molecular plane. From Gross et al. [15 Links to an external site.]. Based on the AFM image shown in (b), what kind of substance is Hexa-peri-hexabenzocoronene? There may be more than one correct answer.
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