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Mike Slater
This Slideshare version of thepresentation includes someadditional explanatory text notincluded on the original slides
Recognition   Evaluation   Control
Recognition    Evaluation     ControlOccupational hygiene is about preventing illhealth at work
Recognition   Evaluation     ControlMeasuring exposure to hazardoussubstances can be an important part of thatprocess
A new Workplace Exposure Limit (WEL) hasrecently been introduced for sulphuric acid mist
It’s the first limit to be specified as the thoracicfraction
The “thoracic fraction” includes those particles that can deposit in the regions of the respiratory system coloured blue a...
Criteria for selecting a suitablemethod:
Criteria for selecting a suitablemethod:    Specificity                           
Criteria for selecting a suitablemethod:    Specificity                               No interferences from other    comp...
Criteria for selecting a suitablemethod:    Specificity                               Sensitivity                        ...
Criteria for selecting a suitablemethod:    Specificity                                 Sensitivity                      ...
Criteria for selecting a suitablemethod:    Specificity                               Sensitivity                        ...
Criteria for selecting a suitablemethod:    Specificity                               Sensitivity                        ...
BS ISO 21438-1: 2007  Workplace atmospheres – Determination of  inorganic acids by ion chromatography,  part 1: Non-volati...
BS ISO 21438-1: 2007  Workplace atmospheres – Determination of  inorganic acids by ion chromatography,  part 1: Non-volati...
BS ISO 21438-1: 2007  Workplace atmospheres – Determination of  inorganic acids by ion chromatography,  part 1: Non-volati...
Source:www.tsi.com
ParticulatesInhalable    Thoracic      Respirable
Particulates  Inhalable     Thoracic      RespirableLets look at the methods used to collectthe different fractions
ParticulatesInhalable    Thoracic      Respirable
Inhalable Fraction 7 hole head              IOM head   Filter cassette  Operate at 2 litres/minute
I.O.M sampler  The common sampler used in the UK
BS ISO 21438-1: 2007  Workplace atmospheres – Determination of  inorganic acids by ion chromatography,  part 1: Non-volati...
ParticulatesInhalable    Thoracic      Respirable
Respirable Fraction                                The cyclone samplerSource: http://www.skcinc.com
ParticulatesInhalable    Thoracic      Respirable
Thoracic Fraction
Thoracic Fraction A universal method has not been established
Thoracic Fraction So let’s look at some possible options
Respirable - Thoracic CyclonesThis sampler is usedfor oil mist in the USASource: www.bgiusa.com/ihi/hfrtc.htm
Parallel Particle Impactor  Size-selective Samplers for Thoracic or  Respirable ParticulatesSource: http://www.skcinc.com/...
So what are the options forsampling sulphuric acid mist?
Criteria for selecting a suitablemethod:    Specificity                               Sensitivity                        ...
Nyrstar method                 Staplex Model                 TFIA-2F high                 volume sampler                 w...
Nyrstar method                 Not personal                 sampling
Nyrstar method                 Not thoracic                 fraction
Nyrstar method  Specificity                        Sensitivity                        Thoracic fraction                 ...
Source:www.tsi.com
Option 1 Sample for inhalable fraction
BS ISO 21438-1: 2007   Specificity                          Sensitivity                          Thoracic fraction      ...
BS ISO 21438-1: 2007    Specificity                               TheSensitivity with interferences can be     problems o...
Option 1 Sample for inhalable fraction This approach will overestimate the thoracic fraction
Option 1 Sample for inhalable fraction But if results lower than 0.05 mg/m3, then the thoracic concentration will be well...
Option 1 Sample for inhalable fraction If results substantially higher than 0.05 mg/m3, then it is likely that the limit ...
Option 1 Sample for inhalable fraction But results will be difficult to interpret if they are just above 0.05 mg/m3
Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist
Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist Method development and validation...
Option 2 Develop and validate a method for the thoracic fraction of sulphuric acid mist I think it is unlikely that HSE w...
Other important considerations Correcting for background sulphate Sampling strategy Interpreting results
mike@diamondenv.co.ukwww.diamondenv.co.ukhttp://diamondenv.wordpress.comwww.slideshare.net/mikeslaterTwitter @diamondenvMi...
Mike Slater, Diamond Environmental Ltd. (mike@diamondenv.co.uk)     This presentation is distributed under the Creative Co...
Sampling for sulphuric acid mist version for slideshare
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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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Transcript of "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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