What will be the filter diameter for the 24-hour samplers?
R: 47 mm filters are used in all samplers that are under consideration. Q: What will be the filter diameter for the MOUDI sampler? R: The MOUDI substrates can be either 37 or 47 mm, depending on the particular MOUDI unit. You can assume 47 mm for the purposes of this proposal. Q: Will the 24-hour samplers be Anderson or R/P? Will the Study supply the mounting rings? R: The manufacturer of the filter sampler (L and M in Table 1 of the RFP) has not been selected. We expect to use the same model speciation sampler as that to be selected by ARB for their California network. The Study will supply mounting rings, as needed. Q: Does the Study want Zefluor filters for the MOUDI sampler? R: Commercially available filters have been found to be too thick for use as MOUDI substrates. MOUDI substrates must be cut or punched from sheets of aluminum foil or Teflon. Q: Does the Study or ARB have an SOP for doing carbon on aluminum filters? Al melts at ~660 o C, and elemental carbon is pyrolyzed in the
