Question

(c) Why is atomic absorption not used for qualitative analysis? {2} (d) Briefly describe how background correction in atomic absorption spectroscopy is achieved by the following methods, Zeeman 11) Two line method

Answer 1

wed for Atomic adsorphion not quali tative analyh's canret haue alterphen becauue ta ble we peniodi c tn elements and to many few mauy ele ments nahre why diiut have Similan adsorption peatra, that is analyse C) zeeman magnetic field is applied to atoms, cauwe mui lhple In a zeeman Effeet, this levels Spliting the electricani'c energy be present. and the onginal ine that formed them. in it Sum af these to absorptim leet Lines is dines eaual to the the iseavat to has two Componentt. the absorphan ines oniginal wavelength, and igma ampnent two absaptiens pi Component and is that which is both negativey and pohvely Shiftel So one is present at the right of the pi Line dines ane preent. ine pi left of the and anather present at conerhiom System, recli athon from a holiow n a DC 2eaman catho de lamp passes thrOugh a rotairg polanzer to a furnate per ma nent magnet. passes thrangh the tuhen Surnrounded by a the radiatiom from Ahe 4cL Yolahing pola rizer two foms f polarired light produced ane dight that is fiad. when ight is polariz ed paratiat atomic and backgroond absorpton when ight is polant zedl perpendi cular to the pield polarized to per pendiculan the to the field, both the occurS and absorption occurS Cnly backgroundl Sigral The backgrourd absoption from the combined bacrgrourel and is Substractod

absoptim Sigral Alonic to obtain a atomic absophm net Sigral Gn AC Correchon Sstem, a Stationhy polariaer is 2eeman present SCurces, and an electro magret is pmesent In tront of the aTound the magnet field is off, both the the furnate when when the back graurd occurs abeaphian atomic and the magnetic fieid is on, only batkground abso Tphion oceurs. Again the back graind Signal is sabstracted fror combined atomie 4he atomic absorphi on net to and back graindl gnal Obtain Sigral n Two-ine Comection Corech ons in two- ine Yeference mea sure backgraund epfects hollow cathode of Inlerest, it stiu produoes Aine Source is wed to from the Even though from dhe af the mtrix Sampe. element ta mps ane Speafic to am emission ines are the se emission di'nes. Some of nume Yau interest, but of element ines the 4he for Tesorante the non well. one hi'nes are resent as ron- retonanee Such Lires be ased as reference dine ean tesonance ines the cathocdes, gas in emisrion of from Can Telult nem resonamee hine will io the Surh as neon close to the absosbecl by the nat Sample. Any Sampte hine, but witt measurmenbs from the Source ane then wedl abso rbamce rTect the the a bsorbance Sample of