aes-aas
TRANSCRIPT
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ATOMIC SPECTROPHOTOMETRY
Anshar Saud
Faculty of Pharmacy Hasanuddin UniversityOctober 2009
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ATOMIC SPECTROPHOTOMETRY
Atomic Emission Spectrophotometry (AES) Atomic Absorption Spectrophotometry (AAS)
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ATOMISASI
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ATOMIC EMISSION SPECTROPHOTOMETRY (AES)
Prinsip Atom secara termal dieksitasi sehingga memancarkan
cahaya yang terukur Penggunaan
Penghitungan logam alkali pd: garam logam alkali, infus & garam dialisis
Penentuan ketakmurnian (impurities) logam dalam beberapa garam anorganik
KelebihanFlame photometry mrp metode yg sempurna murah dan selektif pd analisis kuantitatif bbrp logam
KekuranganHanya utk beberapa Alkali dan garam alkali
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PENDAHULUAN Berperan penting dlm kontrol Na, K dan Li
bbrp bhn baku dan formulasi
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PROSES ATOMISASI
[M+,X-]aq [M+,X-]aqnebulization
solution mist
[MX]solidvaporizationdesolvation
[X0]gas[M0]gas
[MX]gas
atom
izat
ion
[M+]gas [X+]gas
ato
miz
atio
n
[M*]gas[M0]gasemission
excitation or
absorption
(via heat or light)ground state excited state
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INSTRUMENTASIFlame
logam diuapkan pada gas alam (udara/asetilen) 2000°C
Monokromator/FilterRadiasi yg dipancarkan atom yg tereksitasi melewati filter/monokromator
DetektorIntensitas radiasi diukur menggunakan photo sensitive cell
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FLAME
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ATOMIC ABSORPTION SPECTROPHOTOMETRY (AAS)
PrinsipAtom dalam logam yg diuapkan dlm flame diserap oleh radiasi narrow band yg dihasilkan oleh hollow cathode lamp & terukur melalui detektor
PenggunaanPenentuan residu logam (cemaran logam) dalam obat
KelebihanLebih peka dari AES, mrp metode spesifik dlm QC
Kekurangan– Hanya terbatas pd elemen logam– Tiap elemen membutuhkan hollow cathode lamp
yg berbeda utk determinasinya
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INTRODUKSI
Utk bbrp atom, perbedaan energi ground state dgn excited state terlalu besar utk eksitasi termal, shg digunakan AAS
Hollow cathode lamp dilapisi logam yg akan diuji
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INSTRUMENTASI Sumber Cahaya
Hollow cathode lamp dilapisi elemen yg akan diuji
FlameUdara/asetilen temp 2500°C
MonokromatorMenurunkan range pita radiasi utk mengatur radiasi dari hollow cathode lamp
DetektorPhoto sensitive cell
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AAS
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AAS
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FLAME ATOMIC ABSORPTION SPECTROMETRY (FAAS)
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