exam5key - CH 455 Prof I. A. Holcombe Name fti;akr;.r- r ~...

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CH 455 fti;;ak ~ ~ 0, Prof I. A. Holcombe ~ Exam 5 r;.r- r j \ Name ~ ~lr---'::. '- luly 8,2009 (Also write your name in the upperrfg t h d ~ an corner ofthe f 1 " eo Ihe la" page oflMuxam.) . a) Usmg the dIagrams at the right describe th . processes associated with the f,' II' e s~epwlse noted in (i) and (ii) below AI 0 oWI~g techmques relation~hip of concentration t~o~~o~~~t:t~:xpected appropnate measured quantity , e g .., cone oc: Intensity. . A i) Atomic emission spectroscopy. (4 piS) (# ... - "i,ah~ e, J-. ..h ..... (A }~-h> "'" c.te J (eb-hr~ Ie} 'S"~~ :Do~et p rc J, il- h t'"}#\ trlfY'" '6' ()y' E (~.R~"'7 ...... I~/e ... ~,fy ,.; B ra,Jl, o-h ~) . C-crn 0< I: L f .. C. 1\ ~""'~1"1 JI) At . . omlc absorption spectroscopy. (4 piS) t1 .,;"1 Wil~~H. . =rre.sr-.P'';, ~ s-I--""r:r . .... b~,; ~MII-.<?Y" (It ........ -,e-) (/J,/rt,J. INItf,;,. . .... ~r ~ ~ocJ,. ...... ",hJ. .) /L. 1'I-h-" .... 7 ~ 7' 1i ... 1 ). '" ~ .... r<. .( ,.. t&. 1'r~~uz. (.z;) tJvrI.~ a.. b ~ ~ (z. 0) r( SO tJ-?"\ f lL- e 071 C pt A ~.~ bte.-f\c.<. .. b) ~y ~re there fewer spectral interferen' . ere are m ICP emIssIon? (4 piS) ces m flame atomic absorption spectroscopy than th . A ~ ... ...dv ,.u-lu~ 7 k/d~l. .-. ..7rtt. .~ ca. .-t ~" /, 7 '+ oS ; nUt- -rk -tv lM ~/.f,'; ... frl t< ~f bYlf'" A-tL. .- I ~ -re.-- ~eP.:l--~ic ~-/dk. ;;. .-IIA, ;:r:-" IC ~ J ~ ./-7r~r-i' ~",;f /r JJ t7Y' -I ~-'r "lfl.l, u c,.(e). . ~-I. ...te,. j</h~ C8<--' ~lo. ..)< Iz, .c Ia- .. ~ 1'\. ...-0/ 1 /61Q</ -s.J. ..t2. <3--"'c1 I /£kI Awrtdr<J$ ..t' ..;t.ou;~ '1 1 rfyiJl "~r~
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c) What is one key advantage of graphite furnace AA over flame AA or lCP emission spectroscopy? (4 piS) - /"11 C ro 'S CL+t1. ff.t.:, - 'S-e.-n c=;. +. If. +, _ -- tA s.R of' 'S' 0 ( l ~ ~ '5 lc.Lvtr e.s. d) Name one significant advantage oflCP emission spectroscopy over atomic absorption. (4 pis) - "IM~tu~lA-'> ,.... ,~.e.Le~/L+- ~~1S;S 2. The plot of plate height as a function of gas flow rate in GC shows that at elevated flow rates, the plate height
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exam5key - CH 455 Prof I. A. Holcombe Name fti;akr;.r- r ~...

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