1 / 12

Year “7” and Year “8” Studies Focusing on Mulch

Year “7” and Year “8” Studies Focusing on Mulch. Mulch – Buffer Materials. Early research has shown that mulches made from recycled dimensional wood can be contaminated with CCA (Townsend et al. 2003).

trella
Download Presentation

Year “7” and Year “8” Studies Focusing on Mulch

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Year “7” and Year “8” Studies Focusing on Mulch

  2. Mulch – Buffer Materials • Early research has shown that mulches made from recycled dimensional wood can be contaminated with CCA (Townsend et al. 2003). • Follow-up study -> Year 7 – South Florida Year 8 – Rest of Florida

  3. Mulch made from C&D Wood

  4. Mulch Analysis Methods Visual Inspection Size Distribution Sample Ash for total Metals SPLP Analysis

  5. Mulch Ashing Results Ashed Samples: 20 Colored: 14 Not Colored: 6 Positive for Arsenic: 6 Not Positive for Arsenic: 8 Positive for Arsenic: 1 Not Positive for Arsenic: 5 All 6 samples contained plywood indicating that they contained recycled dimensional wood.

  6. Concentration Range of Arsenic Samples

  7. Arsenic vs. Chromium

  8. Mulch SPLP Results SPLP Samples: 32 Not Colored: 15 Colored: 17 Positive for Arsenic: 5 Positive for Arsenic: 8 Not Positive for Arsenic: 9 Not Positive for Arsenic: 10 All 8 samples contained plywood indicating that they contained recycled dimensional wood.

  9. Concentration Range of Arsenic Samples

  10. Arsenic vs. Chromium

  11. Conclusion • Engineered wood was found in 28% of consumer mulches • Arsenic was found in 35% consumer mulches • SPLP tested showed that arsenic leached from 37 % of consumer mulches • 26% of these samples leached over 50 μg/L

  12. Mulch Leaching Study Effect of Iron Oxides on Leaching of CCA

More Related