Supplemental Information

Revisiting the Size Selective Performance of EPA's High-Volume Total Suspended Particulate Matter (Hi-Vol TSP) Sampler

Jonathan D. Krug, Andrew Dart, Carlton L. Witherspoon, Jerome Gilberry, Quentin Malloy, Surender Kaushik, Robert W. Vanderpool

S-1: Size Distributions of Dust (A4, 10-20, 20-40)

Figure S1. Relative particle distribution of bulk dust (each point is the % of total counts that occur in that bin)

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Figure S2. Particle count distribution of each bulk dust in electrolyte solution.

S-2: Custom Hi-Vol TSP filter cassette

Figure S3. Custom Hi-Vol TSP filter cassette machined from 0.25” aluminum: A) top of cassette, B) bottom of cassette, C) with filter installed, and D) installed in Hi-Vol TSP.

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S-3: Hi-Vol TSP Sample Collection and Extraction ProcedureHi-Vol TSP Flow Check

1. Install a loaded Hi-Vol TSP cassette with 3µm Polycarbonate filter. 2. Attach the HiVolCal to the top of the cassette and clamp it down tight.3. Turn on the HiVolCal then start the roots blower, PID set point = 54.5.4. Record room temperature then record temperature from thermometer in the muffler on the

outlet of the roots meter.5. Allow the blower to warm up for a minimum of 5 minutes then record the outlet gas

temperature in the muffler on the roots meter.6. Use a stopwatch and record a start volume on the roots meter as you start the watch, then

record a stop volume after a period of 10 minutes. Calculate flow rate using the volume, temperature and elapsed time.

Flow (SLPM) = (Stop volume – Start volume )∗460+Ambient Temperature (° F)

460+Outlet GasTemperature (° F)Elapsed Time (min)

(S1)

7. Compare the calculated flow to the HiVolCal reading and record each. Adjust the PID controller if the calculated reading is off by 10% or more.

Hi-Vol TSP Filter Extraction

1. After the sample collection is complete, open the Hi-Vol TSP roof.2. Mist the filter w/Di H20, make sure surface is well moistened. 3. Wipe the top surface of the Hi-Vol cassette and thumb nuts with a clean DI/IPA wipe. Be careful

not to introduce any additional dust onto the filter from the cassette. Wiping from the inside edge to outside edge.

4. Remove the clamping thumb nuts.5. Cover the cassette and take it to lab for extraction.6. In the lab, set up the extraction stand with large funnel, 63 µm sieve and stainless steel

collection container.7. Fill a squirt bottle with 800 mL of electrolyte solution (Isoton/Glycerol - 80/20)8. Remove the cover from the Hi-Vol cassette and place the entire cassette in the funnel with one

corner being the lowest point. Given the level of difficulty in separating the filter from the cassette without losing any particulate matter, this will be the simplest approach for extraction.

9. Rinse the entire filter surface through the funnel into the SS container.10. Sonicate the rinsed solution for 10 secs.11. Pour solution into an additional SS container back and forth ~10 times.12. *Dilute the solution 1:4 using the balance by pouring the extract solution into a 400ml coulter

beaker, note weight and then bring it up to the calculated dilution weight volume with electrolyte solution.

13. Analyze via Coulter Counter.

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S-4: Tables of Literature Effectiveness Values

Table S1. Effectiveness values from McFarland and Rodes 1979. All data from 1 RPM rotational tests. Data was pulled from plots, data denoted by [brackets] was pulled from text.

Table S2. Effectiveness values from McFarland and Rodes 1979 for 23.5 µm Dpa tests of 11.5”x14” sampler operated in fixed orientation.

Table S3. Effectiveness values from Wedding 1977 conducted at a wind speed of 16.46 km/hr.

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S-5: Kruskal-Wallis p-value Tables

Table S4. Test-by-test p-values from the Kruskal-Wallis comparisons of effectiveness values from 5 – 20 µm Dpa. A p-value less than 0.001 may indicate that the impacts from either wind speed and/or wind direction significantly modify the Hi-Vol’s effectiveness over this size range.

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Table S5. Test-by-test p-values from the Kruskal-Wallis comparisons of effectiveness values from 20 – 30 µm Dpa. A p-value less than 0.001 may indicate that the impacts from either wind speed and/or wind direction significantly modify the Hi-Vol’s effectiveness over this size range.

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