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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.

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Lecture 8

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  1. Lecture 8 Elementorganic Toxins

  2. Determination Graphite furnace atomic absorption Cold Vapor Atomic absorption and Fluorescence ICP-MS HPLC-ICP-MS GC-MS GC-ECD

  3. Electrodeless Discharge Lamps Sn, Cd, Hg, Zn, Pb, As, Sb, Bi, Tl, In Se, Te, Rb, and Cs

  4. 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:

  5. PerkinElmer MHS-15 Mercury Analyzer N2 To cuvette SnCl2 Sample compartment

  6. Thermo Jarrel Ash Smith-Hieftje 11 AAS Hollow cathode Hg lamp Detector Quarz cuvette Monochromator 253.6 nm Hg vapor Data processing

  7. ECD detector

  8. ICP detector

  9. sarin warfare agent GC Malathion Malaoxon Organophosphorus Pesticides

  10. 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

  11. 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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