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- W2370740107 abstract "Contamination of oxygen-consuming organics (OCOs) was one of the most serious problems in the Yellow River. This study was conducted with the purpose of analyzing the monitoring data on OCOs contamination for the river in 1980 and from 1992 to 1999 as well as examining the effect of suspended solids (SS) on chemical oxygen demand (COD_(Mn)) and biological oxygen demand (BOD_5) of river water. Several significant results had arisen from the study. First, the fulvic acid, one of the main composition of humic substances in SS, could hardly be biodegraded in natural conditions. However, it could be dissolved into water phase when pre-treating water sample with acid, and could also be oxidized by chemical oxidants such as potassium permanganate. Therefore, COD_(Mn) would exaggerate the pollution degree of OCOs in river water due to a high SS content. Second, BOD_5 of the river water showed an increasing trend from the higher to the lower reaches of the mainstream. Third, annual averages of BOD_5 of river water in 1992 were significantly higher than those in 1980 and they showed an increasing trend from 1992 to 1999. In low-water season, the averages of BOD_5 showed an increasing trend from 1992 to 1999; while in high-water season, the increasing trend was not significant. Therefore, it indicated that the load from point sources showed an increasing trend during 1992 to 1998. In contrast, the load from non-point sources did not show an increasing trend, and even manifested a decreasing trend during this period. Fourth, OCOs in river water of the mainstream was attributed mainly to point sources; the ratio of point to non-point sources of BOD_5 was about 2.81." @default.
- W2370740107 created "2016-06-24" @default.
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- W2370740107 date "2004-01-01" @default.
- W2370740107 modified "2023-09-26" @default.
- W2370740107 title "Contamination characteristics of oxygen-consuming organics in the Yellow River and the effects of suspended solids on its monitoring" @default.
- W2370740107 hasPublicationYear "2004" @default.
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