Notes

Slide Show

Outline

1	Measurement of Fine Particulate Mass, Including the Semi-volatile Constituents, with a GRIMM Monitor Brett D. Grover, Norman L. Eatough and Delbert J. Eatough, Brigham Young University Philip K. Hopke, Clarkson University Judy Chow and John Watson, Desert Research Institute Hans Grimm and Bill Roe, GRIMM Technologies, Inc.
2
3	"The RAMS monitor developed by..." The RAMS monitor developed by BYU and the R&P FDMS have been shown to measure semi-volatile nitrate and organic material, but not water. The GRIMM monitor measures particle size distribution and estimates mass. These methods were compared in studies during July 2003 in Rubidoux CA & December 2003 in Fresno CA. PC-BOSS and other semi-continuous compositional data were obtained to help explain any differences observed.
4
5
6
7
8
9
10	"Data obtained in July 2003..." Data obtained in July 2003 during LA Basin inversion conditions. Rubidoux is a residential community on the west side of the Basin (by Riverside) PM_2.5 composition included ammonium sulfate and secondary semi-volatile organic material FDMS TEOM Differential TEOM 50C TEOM GRIMMS R&P Nitrate Sunset Lab C (SVOC) PC-BOSS RAMS
11	GRIMM and FDMS Comparison
12
13	Water Content Estimated
14
15
16
17
18
19	"Data obtained in December 2003..." Data obtained in December 2003 during San Joaquin Valley winter inversion conditions. Fresno is a residential community in the central valley area PM_2.5 composition included ammonium sulfate and secondary semi-volatile organic material RAMS FDMS TEOM Differential TEOM 50C TEOM GRIMMS R&P Nitrate & Sulfate Dionex Sulfate & Nitrate Sunset Lab C (SVOC) PC-BOSS
20
21	"Sulfate from Dionex monitor" Sulfate from Dionex monitor, present as ammonium sulfate Nitrate from Dionex monitor, present as ammonium nitrate C from R&P monitor, OC to OM factor = 1.6
22	Constructed mass was a little less than measured mass by both instruments (Probably due to under-measurement of SVOM by the R&P Carbon Monitor)
23
24
25	The difference between the normal and heated GRIMM monitors could not be explained by only ammonium nitrate and water, particularly for the latter part of the study (additional evidence for significant SVOM)
26
27	The heated GRIMM monitor and a heated TEOM monitor are not identical, but both are low
28	"Semi-volatile nitrate and organic material..." Semi-volatile nitrate and organic material is included in the mass measured with the GRIMM Monitor, RAMS, FDMS TEOM and Differential TEOM. These four measurement methods appear to be equivalent. The GRIMM monitor also appears to respond to fine particulate water content. The heated GRIMM and TEOM and the FRM single filter sampler both give results which are low.
29	"The United States Environmental Protection..." The United States Environmental Protection Agency through its Office of Research and Development partially funded the research described here under contract or number BC-R044-NAEX to Brigham Young University. Mention of trade names or commercial products do not constitute endorsement or recommendation for use.