concept map iuk107

8/12/2019 Concept Map Iuk107

1/18

Other Chem WindowIUK107 Part 2Other Window of Chemistry for Technologists1. Materials: synthetic (IUK 107 Part 1) & natural

(IUK 107 Part 2)

2. Trendy natural: Biomass3. Inorganic component is naturally contained in

biomass

4. Analysis should include inorganics: Uv-vis,AAS, ICP, EDAX.

5. Previous organic analysis included: IR, NMR,(+GC-MS)

02/12/2013 1Concept Map - Part 2 IUK107 - Other ChemWindow for Technologists


2/18

Concept MapIUK107 Part 2Other Window of Chemistry for Technologists

5 December 2013

1.Organic & Inorganic Samples:

Preparation Concept & Analyses

2Touch up on MS of HalogenatedCompounds



3/18

INORGANICS: Biomass & Materials

New: fungus on keratinised tissue:

Touch on sample preparation: matrix + filler

Scanning Electron Microscopy with Energy DispersiveAnalysis of X-ray

Light & Absorption as Materials Response to Radiation

Summary - InorganicsIUK107 Part 2 Other Window of Chemistry for Technologists



4/18

Towards relevance in intellectual capacity:

Uv-visible Spectroscopy

Atomic Absorption Spectroscopy

Inductively Coupled PlasmaQuiz 1

Group Presentation - excellent collaborative workalthough too detail.

SummaryIUK107 Part 2 Other Window of Chemistry for Technologists

UV-VIS AAS ICP

Source Uv-vis light HCL Plasma

Sample Response (many effects) Atomise Ionise

Power Low E radiation Furnace: 2000oC



5/18

INORGANICSupposedly

Sample preparationIUK107 Part 2 Other Window of Chemistry for Technologists

Sample can containmixture of elements

Name 1 that

experience

inteference if in

mixture

Normally Quantitative

-calibration curve



6/18


7/18

ORGANICSample preparation

IUK107 Part 2 Other Window of Chemistry for Technologists

Borrowed pic

dont

confuse

Consequence

Required due to

instrument limitation at

handling mixture

Name one technique

thats capable



8/18

SEM/EDAX: Electron image | EDX: Intensity vs energy(keV)

UV-VIS: 200-800 nm; analyte responses: A vs l (nm)

AAS: HCL source; atomisation; atoms A;A vs l (nm)

ICP: Plasma source and ioniser; ions A;A vs l (nm)

Spectral ResponsesIUK107 Part 2 Other Window of Chemistry for Technologists


IR: wavelength =0.78-1000 mm: % transmittance vs 1/l (cm-1 :

400-4000)

NMR: nucleus resonance; probe dependent; Intensity vschemical shift (ppm)

GC-MS: GC Separation:intensity vs tR | MS Fragment:

Abundance vs m/z (speciation)


9/18

Uv-visible SpectroscopyAll - colour

Atomic Absorption Spectroscopy

Inductively Coupled Plasma

SEM/EDXS, organic, inorganic-EDX Infra-red Spectroscopy:L/S/G

Nuclear Magnetic Resonance: PROBE - L/S

Gas Chromatography-Mass Spectrometry L/G

volatile, stable


10/18

IR Scan the functional group of a molecule

Pure or reference/standard/expertise/familliarity required

NMR structural elucidation

Pure or simple mixture

MS verify/confirm elucidated structure

Must pure or need standards

Stepwise Analysis - organicsIUK107 Part 2 Other Window of Chemistry for Technologists

Functionalregion: 1500-

4000 cm-1

Fingerprint:500-1500 cm-1

Atlas/Database match

Mixture is ridiculous


Uv viswherecolouris present


11/18

SEM/EDXCheck types of elements

Proceed with quantitative techniques

AASDecide on hollow cathode lamp

Prepare standards

Find sample digestion procedure

ICPAllows us to skip SEM/EDX and AASTo some extent, ICPMSrules out theneed for XRD, XRF, XPS

Stepwise Analysis InorganicsIUK107 Part 2 Other Window of Chemistry for Technologists


Uv viswherecolouris present


12/18

Start off: SEM/EDX Imageidentify variation (# of

forms)

Semiquantitative via EDX Check the types of elements

present

Check presence of C

If nonecheck ash %

If C present, analysis of inorganicsrequires ashing procedure

Nextproceed woth analysis.

Stepwise Analysis Totally unknown (s l)IUK107 Part 2Other Window of Chemistry for Technologists


If (l): Start

off: IR for

functional

group.


13/18

CH2Cl2 Calculate MW. This is for M+

Check radioisotopic probability:

M+ and all M++2

Abundance: 50:50% (note complexity)

Draw:

Indication:

IUK107 - Part 2. Separation and Speciation:GC-MS

13

Important Examples


14/18

Mass SpectroscopyIUK107 Part 2Other Window of Chemistry for Technologists1. CH2CCl2



15/18

CH2Br2 Calculate MW. This is for M+

Check radioisotopic probability:

M+ and all M++2

Abundance: 50:50% (note complexity)

Draw:

Indication:

IUK107 - Part 2. Separation and Speciation:GC-MS

15

Important Examples


16/18

Mass SpectroscopyIUK107 Part 2Other Window of Chemistry for Technologists1. CH2Br2



17/18

QuestionsIUK107 Part 2Other Window of Chemistry for Technologists

1. Quiz 1

2. Quiz 2



18/18

Concept Map - togetherIUK107 Part 2Other Window of Chemistry for Technologists


concept map iuk107

Documents