Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition ofCO2 as a function of the concentration of methane measured in the soil andaquifers of a site contaminated in the residues of aviation fuels. Explain brieflythe aim of these particular measurements made to the environmental study. Alsoexplain briefly why there is a difference in isotopic composition of CO2 obtainedvia aerobic degradation and methanogenic degradation of AVGAS (fuel residuesas contaminants) and the linear "mixing relationship" noted in Figure 7.3530methane oxidationmethanogenicdegradationof AVGAS25 -2015SamplingLocations10aerobiedegradation ofAVGASA 12• 1356.14O 20O 219O 10-30-25-20-15-10-58®C (%c) of CO,Fig. 7. Plot of %CH4 vs the 8'³C values of CO2 by sample location for all samples containing CH4 from the study site. The dashedline is a best fit line through the data. Also shown are the approximate fields that would be expected for methanogenic and aerobicdegradation of AVGAS, and the trend that would be expected for significant levels of methane oxidation.% CH,

The objective of this question os to show the presented the variation of the isotopic composition of…

Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition of CO₂ as a function of the concentration of methane measured in the soil and aquifers of a site contaminated in the residues of aviation fuels. Explain briefly the aim of these particular measurements made to the environmental study. Also explain briefly why there is a difference in isotopic composition of CO₂ obtained via aerobic degradation and methanogenic degradation of AVGAS (fuel residues as contaminants) and the linear "mixing relationship" noted in Figure 7. CH₂ 35 30- 25 20 methane oxidation methanogenic degradation of AVGAS

Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition of CO₂ as a function of the concentration of methane measured in the soil and aquifers of a site contaminated in the residues of aviation fuels. Explain briefly the aim of these particular measurements made to the environmental study. Also explain briefly why there is a difference in isotopic composition of CO₂ obtained via aerobic degradation and methanogenic degradation of AVGAS (fuel residues as contaminants) and the linear "mixing relationship" noted in Figure 7. CH₂ 35 30- 25 20 methane oxidation methanogenic degradation of AVGAS

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter30: Capillary Electrophoresis, Electrochromatography, And Field-flow Fractionation

Section: Chapter Questions

Problem 30.9QAP

See similar textbooks

Similar questions

Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition of CO2 as a function of the concentration of methane measured in the soil and aquifers of a site contaminated in the residues of aviation fuels. Explain briefly the aim of these particular measurements made to the environmental study. Also explain briefly why there is a difference in isotopic composition of CO2 obtained via aerobic degradation and methanogenic degradation of AVGAS (fuel residues as contaminants) and the linear “mixing relationship” noted in Figure 7. How does the degradation process influence the CO2 isotopic signature ? I don't understand why the CO2 from aerobic degradation is lighter than the one from methnogenic degradation ?
You have a treatment process in which a microbial population consumes a substrate (chemical A) according to Monod kinetics, with Hmax=2 d', Ks = 350 mg/L, and Y 0.15 g cells/g A. What biomass concentration (in mg/L) must be maintained to result in a substrate utilization rate of -1000 mg/L- hr for a concentration of A equal to 5000 mg/L? %3D %3!
State and explain the appropriate gas laws involved in the spread of covid-19 outbreak in aircraft cabins and explain how the suitable gas involved can cause Covid-19 virus to spread rapidly in aircraft cabins.
The compound diborane (B2H6) was at one time considered for use as a rocket fuel. Its combustion reaction is B2H6(g) + 3 O2(l) → 2 HBO2(g) + 2 H2O(l). The fact that HBO2, a reactive compound, was produced rather than the relatively inert B2O3 was a factor in the discontinuation of the investigation of the diborane as a fuel. What mass of liquid oxygen (LOX) would be needed to burn 234.4 g of B2H6? Answer in units of g. (part 2 of 2) What mass of HBO2 is produced from the combustion of 94.7 g of B2H6? Answer in units of g.
(1) If CO2 evolution from a typical soil is 1 mg CO, kg soil day, and soil organic C content is 1% of soil, calculate the mean residence time of soil organic C, provided that soil organic C is at the steady state.
P17A.1 The following initial-rate data were obtained on the rate of binding of glucose with the enzyme hexokinase present at 1.34 mmol dm. What is (a) the order of reaction with respect to glucose, (b) the rate constant? [C,H,„O,J/(mmoldm³) 1.00 1.54 3.12 4.02 12 v/(mol dms) 5.0 7.6 15.5 20.0
3. (а) 0.0050 M operate at one-quarter of its maximum rate? At what substrate concentration would an enzyme with a kcat of 30.0 s-1 and a KM of (b) trations [So]: ½ Km, 2 KM, and 10 KM. Determine the fraction of Vmax that would be obtained at the following substrate concen- (c) 1 (HIV-1) has been the object of innumerable studies to develop effective chemotherapeutic agents. It has been shown that p6* known as the late assembly protein is an inhibitor of HIV protease. An assay was developed using an artificial polypeptide substrate containing a p-nitrophenylalanine residue at the cleavage point that undergoes a small change in absorption at 295 nm upon bond hydrolysis that could be followed spectrophotometrically. The cleavage of the peptide bond is shown schematically on the right. Results of the assay are given in the table below. The protease of the human immunodeficiency virus- Lys NH2 Ala Nle Arg Ala Val-Nle-NH-CH-Ċ–NH-Glu CH2 Lys NH2 Ala NO2 Nle H2ON HIV-1 protease Ala Vo…
.. C Chrome File Edit View History Bookmarks OpenStax - Cher x app.101edu.co 1 7 +/- 2 5 Phthalonitrile (CHN) is produced by the ammoxidation of o-xylene (C₂H₁) according to the following reaction: C₂H₁ (1) + O₂(g) + NH₂(g) → C₂H₂N₂(s) + H₂O(1) How many grams of water would be produced by the complete ammoxidation of 3.98 moles of o-xylene? 8 Chemistry 2e - CX . Question 13 of 24 | g 3 6 9 Profiles Tab Window Help O Aktiv Chemistry X X C + x 100 Submit : f Su C C Copp (CsH gram: of pht < Pre
O b. Microwaves epan a no/cuizatempt.php?attermet=182602&cmid=15775 ape Anbera Universionsi Ogreeusne Vonutlden Sistand Derslerim (10) v Ana sayfa > Derslerim > [517802] (SHUE1001-A) THE EFFECTS OF ENVIROMENTAL AND INDUSTRIAL POLLUTION ON HUMAN HEALTH > Gera Site ana sayfası Benim Sayfam Takvim Rozetler Kalan süre 0:44:13 energy is an ionizing radiation? and Soru 9 Which of the: radiation ARGS Henüz cevaplanmadı Radio waves 3,00 üzerinden işaretlenmiş P Soruyu işaretle O. X ray Od. Mobile phones O e Radar Sonral Önceki sayfa PHILIPS Samsung Quad Camera Shot with my Galaxy A21s 20290942 ARGIZ GULIYE 202909 0290942 NARGI ARGIZ GULIYE 202909 0290942 NARGI LIYEY 02909
Chemistry An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene158 ppm toluene124 ppm ethylbenzene91 ppm xylene45 ppm n-heptadecane161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.
(a) For an altitude of 30 km (235 K), calculate the rate of Oz decomposition by nitric oxide for comparison with the rate of NO regeneration in the NO, catalytic cycle. (b) Repeat the rate calculations at 30 km for the catalytic cycles involving HOx and CIOx. X+ O, k35 / cm molecule's Concentration / A/ cm' molecules E, / kJ mol molecules cm 1.0 x 10° H 2.0 x 10 1.4 x 10-10 3.9 1.9 x 10-1 OH 1.0 x 10 1.6 x 10-12 7.8 3.0 x 10-14 NO 5.0 x 10* 1.8 x 10-12 11.4 5.3 x 10-15 CI Very small 2.8 x 10-11 21 9.6 x 10-12 ХО + О хо Concentration / A / cm' molecule's E, / kJ mol k35 / cm molecules cm molecules 5.0 x 1016 8 x 10-12 17.1 1.3 x 10-15 НО 1.0 x 10 2.3 x 10-11 2.3 x 10-11 HO, 2.5 x 107 2.2 x 10-1" -0.1 2.3 x 10- NO, 5.0 x 10° 9.3 x 10-12 9.3 x 10-12 CIO 2.0 x 107 4.7 x 10-11 0.4 3.8 x 10-1 " The concentrations of species shown are for an altitude of 30 km with the exception of that for CIO, which is for 35 km. The ozone concentration at 30 km is 2.0 x 102 molecules cm. No value is given…
P19B.9 The adsorption of solutes on solids from liquids often follows a Freundlich isotherm. Check the applicability of this isotherm to the following data for the adsorption of ethanoic acid on charcoal at 25°C and find the values of the parameters c, and c,. [acid]/(mol dm³) 0.05 0.10 0.50 1.0 1.5 w/g 0.04 0.06 0.12 0.16 0.19 where w, is the mass adsorbed per gram of charcoal.