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MDN Network Operations – HAL Sample Evaporation Study

MDN Network Operations – HAL Sample Evaporation Study. Follow up study from PO report (Spring/Fall 2012) PO Data Show MDN ACM Evap With Fan On Phenomena associated with MDN ACM only. Data Courtesy – Mark Rhodes PO. MDN Network Operations – HAL Sample Evaporation Study.

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MDN Network Operations – HAL Sample Evaporation Study

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  1. MDN Network Operations – HAL Sample Evaporation Study • Follow up study from PO report (Spring/Fall 2012) • PO Data Show MDN ACM Evap With Fan On • Phenomena associated with MDN ACM only Data Courtesy – Mark Rhodes PO

  2. MDN Network Operations – HAL Sample Evaporation Study • HAL Follow up study from PO (Spring/Fall 2012) • Examine If Capillary Tube The Issue or Fan • HAL 4 Month Study Performed Using 2 ACM • October 2012 - Feb 2013 (Collocated MDN ACMs) • 1 MDN ACM Fan Off • 1 MDN ACM Fan On • 200mL NIST Traceable Spiked (22ng Hg/L) • 400mL Spiked Samples (19ng Hg/Liter) • Collector Lid Immobilized

  3. HAL Evaporation StudyHAL Study SiteNOAA Sand Point, Washington (WA18) MDN ACM #1 MDN ACM #3 • Rotated Weekly MDN ACM Fan Off Vs On • 16+ week Study (Oct 2012 – Feb 2013 • 40 Collocated Samples Collected • Sensors Disabled – Spiked Samples Loaded For 7 Days • ~20 Samples = 200mL Spiked @ 22 ng Hg/Liter • ~20 Samples = 400mL Spiked @ 19 ng Hg/Liter

  4. MDN ACM - HAL Evaporation StudyVolume (mL) Loss Per Sample Bottle Ave Loss Fan On = 20.8 mL (+/- 3.5 mL) Ave Loss Fan Off = 19.5 mL (+/- 1.2 mL) 200 mL Samples 500 mL Samples mL Sample Loss

  5. MDN ACM - HAL Evaporation StudyVolume (mL) Loss Per Sample Bottle Ave Actual Con = 20.8 mL (+/- 3.5 mL) Ave Loss Fan Off = 19.5 mL (+/- 1.2 mL) 200 mL 500 mL Samples mL Sample Loss

  6. MDN Network Operations – HAL Sample Evaporation Study

  7. HAL Sample Evaporation StudyFan On – Actual vs Measured Spike Recovery 200 mL 500 mL Samples

  8. HAL Sample Evaporation StudyFan Off – Actual vs Measured Spike Recovery 200 mL 500 mL Samples

  9. % Recovery Of NIST Traceable Spike(Measured/Actual Spike Concentration) Ave % Recovery Fan On = 96.71% (+/- 4.1%) Ave % Recovery Fan Off = 97.20 % (+/- 3.6%)

  10. % Recovery Of NIST Traceable Spike(Measured/Actual Spike Concentration) Ave % Recovery Fan On = 96.71% (+/- 4.1%) Ave % Recovery Fan Off = 97.20 % (+/- 3.6%) 200 mLVol 500 mLVol

  11. MDN Network Operations – HAL Sample Evaporation Study • Initial Results Do Not Point To Excessive Evaporation or Evaporation Associated With Cooling Fan Running In MDN ACM • Measured Same Evaporative Loss Volume Regardless Of Original Sample Volume and Fan Operation • Results Indicate Despite Small Evap Loss No Loss Of Mercury Or Increased Hg Concentration Was Observed • Next Steps: • Lower Spiked Sample Volume Study (50mL, 100mL) • Modified MDN ACM Thistle Tube Study

  12. MDN HAL Capillary Tubes Picture: Courtesy Mark Rhodes HAL Prototype NCON MDN ACM

  13. PO Evaporation Study (2012)

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