LH J

the ratio ?y is given by

= ¿7.a.32tfhchp[h+] phcho ^ ^ ^ ßf(^7.a.34[h+] + ¿7.a.33-^/) phcooh which depends on both the pH and the relative availability of formaldehyde and formic acid (Figure 7.A.5). The ratio of the gas-phase partial pressures of HCHO and HCOOH

"o

FIGURE 7.A.5 Ratio of the instantaneous formic acid production to destruction rates in a cloud as a function of pH and the ratio of the partial pressures of HCHO and HCOOH.

almost always exceeds unity and usually is around 10; therefore for the pH range of atmospheric interest a net production of HCOOH is expected. The dynamics of these processes during the lifetime of a cloud have been investigated by Chameides (1984) and Jacob (1986).

Additional relatively minor organic aqueous-phase reactions of formaldehyde, formic acid, methanol, CH3OOH, CH302, and CH3C(0)00H are discussed by Pandis and Seinfeld (1989a).

FIGURE 7.A.5 Ratio of the instantaneous formic acid production to destruction rates in a cloud as a function of pH and the ratio of the partial pressures of HCHO and HCOOH.

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