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Discussion of options available for sampling for sulphuric acid mist in the workplace. …

Discussion of options available for sampling for sulphuric acid mist in the workplace.

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  • 1. Mike Slater
  • 2. This Slideshare version of thepresentation includes someadditional explanatory text notincluded on the original slides
  • 3. Recognition Evaluation Control
  • 4. Recognition Evaluation ControlOccupational hygiene is about preventing illhealth at work
  • 5. Recognition Evaluation ControlMeasuring exposure to hazardoussubstances can be an important part of thatprocess
  • 6. A new Workplace Exposure Limit (WEL) hasrecently been introduced for sulphuric acid mist
  • 7. It’s the first limit to be specified as the thoracicfraction
  • 8. The “thoracic fraction” includes those particles that can deposit in the regions of the respiratory system coloured blue and pink on this diagramImage Source: http://www.skcinc.com
  • 9. Criteria for selecting a suitablemethod:
  • 10. Criteria for selecting a suitablemethod: Specificity 
  • 11. Criteria for selecting a suitablemethod: Specificity  No interferences from other compounds that may be present
  • 12. Criteria for selecting a suitablemethod: Specificity  Sensitivity 
  • 13. Criteria for selecting a suitablemethod: Specificity  Sensitivity  preferably can detect concentrations as low as 1/10th of the WEL (i.e. 0.005mg/m3)
  • 14. Criteria for selecting a suitablemethod: Specificity  Sensitivity  Thoracic fraction 
  • 15. Criteria for selecting a suitablemethod: Specificity  Sensitivity  Thoracic fraction  Personal sampling 
  • 16. BS ISO 21438-1: 2007 Workplace atmospheres – Determination of inorganic acids by ion chromatography, part 1: Non-volatile acids (sulphuric acid and phosphoric acid)
  • 17. BS ISO 21438-1: 2007 Workplace atmospheres – Determination of inorganic acids by ion chromatography, part 1: Non-volatile acids (sulphuric acid and phosphoric acid) The method commonly used in the UK
  • 18. BS ISO 21438-1: 2007 Workplace atmospheres – Determination of inorganic acids by ion chromatography, part 1: Non-volatile acids (sulphuric acid and phosphoric acid) This collects the inhalable fraction
  • 19. Source:www.tsi.com
  • 20. ParticulatesInhalable Thoracic Respirable
  • 21. Particulates Inhalable Thoracic RespirableLets look at the methods used to collectthe different fractions
  • 22. ParticulatesInhalable Thoracic Respirable
  • 23. Inhalable Fraction 7 hole head IOM head Filter cassette Operate at 2 litres/minute
  • 24. I.O.M sampler The common sampler used in the UK
  • 25. BS ISO 21438-1: 2007 Workplace atmospheres – Determination of inorganic acids by ion chromatography, part 1: Non-volatile acids (sulphuric acid and phosphoric acid) Collects the inhalable fraction
  • 26. ParticulatesInhalable Thoracic Respirable
  • 27. Respirable Fraction The cyclone samplerSource: http://www.skcinc.com
  • 28. ParticulatesInhalable Thoracic Respirable
  • 29. Thoracic Fraction
  • 30. Thoracic Fraction A universal method has not been established
  • 31. Thoracic Fraction So let’s look at some possible options
  • 32. Respirable - Thoracic CyclonesThis sampler is usedfor oil mist in the USASource: www.bgiusa.com/ihi/hfrtc.htm
  • 33. Parallel Particle Impactor Size-selective Samplers for Thoracic or Respirable ParticulatesSource: http://www.skcinc.com/prod/225-380.asp
  • 34. So what are the options forsampling sulphuric acid mist?
  • 35. Criteria for selecting a suitablemethod: Specificity  Sensitivity  Thoracic fraction  Personal sampling 
  • 36. Nyrstar method Staplex Model TFIA-2F high volume sampler with 4-inch diameter filter
  • 37. Nyrstar method Not personal sampling
  • 38. Nyrstar method Not thoracic fraction
  • 39. Nyrstar method Specificity  Sensitivity  Thoracic fraction  Personal sampling 
  • 40. Source:www.tsi.com
  • 41. Option 1 Sample for inhalable fraction
  • 42. BS ISO 21438-1: 2007 Specificity  Sensitivity  Thoracic fraction  Personal sampling 
  • 43. BS ISO 21438-1: 2007 Specificity  TheSensitivity with interferences can be problems overcome  Thoracic fraction  Personal sampling 
  • 44. Option 1 Sample for inhalable fraction This approach will overestimate the thoracic fraction
  • 45. Option 1 Sample for inhalable fraction But if results lower than 0.05 mg/m3, then the thoracic concentration will be well below the limit
  • 46. Option 1 Sample for inhalable fraction If results substantially higher than 0.05 mg/m3, then it is likely that the limit will be exceeded
  • 47. Option 1 Sample for inhalable fraction But results will be difficult to interpret if they are just above 0.05 mg/m3
  • 48. Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist
  • 49. Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist Method development and validation will be expensive
  • 50. Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist I think it is unlikely that HSE will fund this
  • 51. Other important considerations Correcting for background sulphate Sampling strategy Interpreting results
  • 52. mike@diamondenv.co.ukwww.diamondenv.co.ukhttp://diamondenv.wordpress.comwww.slideshare.net/mikeslaterTwitter @diamondenvMike Slater
  • 53. Mike Slater, Diamond Environmental Ltd. (mike@diamondenv.co.uk) This presentation is distributed under the Creative Commons Attribution-NonCommercial-ShareAlike UK:International Licence