Geoscience Reference
In-Depth Information
Fig. 16.16 Percentage of water-phase parathion degradation product recovered from montmo-
rillonitic (1) and kaolinitic (2) soils, with a the same organic matter (OM) content and b different
organic matter content (Yaron
1975
)
water and in deionized water. The general structures of the sulfa drugs are pre-
sented in Table
16.5
. The natural water (Lake Josephna, St. Paul, Minnesota) is
characterized by pH 8 and 0.2 lm filtered DOC of 5.9 mg/L.
Photolysis of sulfa drugs in the natural lake water was enhanced significantly,
with the exception of sulfadimethoxine. Figure
16.17
, for example, shows the
photodegradation of sulfamethazine in deionized water and natural lake water;
photolysis gave rise to identical photoproducts. The primary product formed in
