Sampling for sulphuric acid mist version for slideshare

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

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  • i'm very happy to find this document because,many informations in site,will help me for to omplimate the acid mist sampling program.
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Sampling for sulphuric acid mist version for slideshare

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

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