synthesis. Exposure of Chinese guger-tree seedlings grown in field chambers
with 325 ppb of SO 2 for 4 weeks showed rapid decreases in photosynthetic rate,
root weight, and total seedling weight.
4 A simultaneous increase (75%) in –SH
groups in leaves was observed.
Once absorbed into a leaf, SO 2 readily dissolves in the intercellular water to
form bisulfite (HSO 3
À
), sulfite (SO 3
2À
), and other ionic species (Figure 8.3).
Air Pollution – Inorganic Gases
113
[16:53 26/8/04 P:/CRC PRESS/4365 MING-HO.751 (1670)/4365-008.3d]
Ref: 4365 MING-HO YU Chap-008 Page: 113 111-134
FIGURE 8.1 The photochemistry of the free hydroxyl radical, OH
Á , controls the rate at which many
trace gases are oxidized and removed from the atmosphere. Processes that are of primary
importance in controlling the concentration of OH
Á in the troposphere are indicated by a solid
line; those that have a negligible effect on OH
Á levels but are important because they control the
concentrations of associated reactions and products are indicated by a broken line. Circles
indicate reservoirs of species in the atmosphere; arrows indicate reactions that convert one
species to another, with the reactant or photon needed for each reaction indicated along each
arrow. Multistep reactions actually consist of two or more sequential elementary reactions. HX ¼
HCl, HBr, HI, or HF. C x H y denotes hydrocarbons.
Source: adapted from W.L. Chameides and D.D.Davis, C&E News, Oct. 4, 1982. With
permission from American Chemical Society.
with 325 ppb of SO 2 for 4 weeks showed rapid decreases in photosynthetic rate,
root weight, and total seedling weight.
4 A simultaneous increase (75%) in –SH
groups in leaves was observed.
Once absorbed into a leaf, SO 2 readily dissolves in the intercellular water to
form bisulfite (HSO 3
À
), sulfite (SO 3
2À
), and other ionic species (Figure 8.3).
Air Pollution – Inorganic Gases
113
[16:53 26/8/04 P:/CRC PRESS/4365 MING-HO.751 (1670)/4365-008.3d]
Ref: 4365 MING-HO YU Chap-008 Page: 113 111-134
FIGURE 8.1 The photochemistry of the free hydroxyl radical, OH
Á , controls the rate at which many
trace gases are oxidized and removed from the atmosphere. Processes that are of primary
importance in controlling the concentration of OH
Á in the troposphere are indicated by a solid
line; those that have a negligible effect on OH
Á levels but are important because they control the
concentrations of associated reactions and products are indicated by a broken line. Circles
indicate reservoirs of species in the atmosphere; arrows indicate reactions that convert one
species to another, with the reactant or photon needed for each reaction indicated along each
arrow. Multistep reactions actually consist of two or more sequential elementary reactions. HX ¼
HCl, HBr, HI, or HF. C x H y denotes hydrocarbons.
Source: adapted from W.L. Chameides and D.D.Davis, C&E News, Oct. 4, 1982. With
permission from American Chemical Society.