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Lecture 8. Elementorganic Toxins. Determination Graphite furnace atomic absorption Cold Vapor Atomic absorption and Fluorescence ICP-MS HPLC-ICP-MS GC-MS GC-ECD. Electrodeless Discharge Lamps Sn, Cd, Hg, Zn, Pb, As, Sb, Bi, Tl, In Se, Te, Rb, and Cs. Digestion Procedure:. 0.1-0.3g.

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Lecture 8

Lecture 8

Elementorganic Toxins


Determination

Graphite furnace atomic absorption

Cold Vapor Atomic absorption and Fluorescence

ICP-MS

HPLC-ICP-MS

GC-MS

GC-ECD


Electrodeless Discharge Lamps

Sn, Cd, Hg, Zn, Pb, As, Sb, Bi, Tl, In Se, Te, Rb, and Cs


Digestion Procedure:

0.1-0.3g

Sample

+KMnO4

HNO3

+NH3OH+

@85oC

30 min

Overnight

To MHS-15

To convert organic mercury into Hg2+

To remove MnO4- ion:


PerkinElmer MHS-15 Mercury Analyzer

N2

To cuvette

SnCl2

Sample compartment


Thermo Jarrel Ash

Smith-Hieftje 11

AAS

Hollow cathode Hg

lamp

Detector

Quarz cuvette

Monochromator

253.6 nm

Hg vapor

Data processing




sarin

warfare agent

GC

Malathion

Malaoxon

Organophosphorus Pesticides


2. hexamethylphosphoramide

3. mevinphos

4. trichlorfon

5. TEPP

6. thionazin (IS)

7. demeton-O

8. ethoprop

9. tributyl phosphate (SS)

10. dicrotophos

11. monocrotophos

12. naled

13. sulfotepp

14. phorate

15. dimethoate

16. demeton-S

17. dioxathion

18. terbufos

19. fonophos

20. phosphamidon isomer

21. diazinon

22. disulfoton

23. phosphamidon

24. dichlorofenthion

25. parathion-methyl

26. chlorpyrifos methyl

27. ronnel

28. fenitrothion

29. malathion

30. fenthion

31. aspon

32. parathion-ethyl

33. chlorpyrifos

34. trichloronate

35. chlorfenvinphos

36. merphos

37. crotoxyphos

38. stirofos

39. tokuthion

40. merphos oxidation product

41. fensulfothion

42. famphur

43. ethion

44. bolstar

45. carbophenothion

46. triphenyl phosphate (IS)

47. phosmet

48. EPN

49. azinphos-methyl

50. leptophos

51. tri-o-cresyl phosphate

52. azinphos-ethyl

53. coumaphos

Organophosphorus Pesticides

Oven temp.: 100°C to 180°C @ 10°C/min. (hold 2 min.), to 300°C @ 18°C/min. Inj. / det. temp.: 250°C / 280°C FPD

Solvent: hexane


2,4-Dichlorophenoxyacetic acid (2,4-D)

2,4,5-Trichlorophenoxyacetic acid (2,4,5-T)

1. 1,4,7,8-TCDD

2. 2,3,7,8-TCDD

3. 1,2,3,4-TCDD

4. 1,2,3,7

5. 1,2,3,8-TCDD

6. 1,2,7,8-TCDD

2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)

GC: 2.0μL splitless injection of TCDD isomers,

approximately 0.5ng each isomer

Splitless hold: 0.45 min ECD detector


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