... described (Na-, Ca-, Ba-, Sr-, Rb-, Li-, Ag-, andPb-CrO4)2. “Type II dichromate: spectra, which are differentiated by the presence of bands in the range 800 to 70 0 cm–1, similar to those of the ... 0.042L829/frame/ch 07 Page 164 Monday, January 31, 2000 3:02 PM© 2000 by CRC Press LLC 170 Aerosol Chemical Processes in the Environment intensities less than 0.1 (Figure 7. 8). The investigations by LAMMA in ... Cr2O 7 2– (Fe-, Ni-, Zn-, Cu-, Co-, Al-,and Cd-Cro4)Raman results of standard chromium compounds and dust aerosols (8 to 10 µm) collected on the portable impactor are summarized in Table 7. 4...