Long-term Trends and Temporal Heterogeneity of Water Quality in Tidally Mixed Estuarine Waters

Park, Gyung Soo; Park, Soung Yun

doi:10.1016/s0025-326x(00)00183-1

Cited by 31 publications

References 10 publications

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Ammonia

Burgess¹

2004

Water Encyclopedia

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Ammonia is a primary breakdown product of nitrogen‐containing organic matter in aquatic environments. Because a great deal of organic matter and waste is introduced into the hydrologic cycle by natural and anthropogenic processes, ammonia can be found in aquatic environments, especially those exposed to large amounts of human or domestic animal wastes. Ammonia is also of great importance in understanding the global cycling of several key elements, including nitrogen and carbon. Ammonia is one of the compound uniquely critical to life which when not present in adequate amounts in aquatic environments can be associated with negative biological effects and when in excess can result in adverse ecological and toxic effects. When insufficient ammonia is available to plants, which assimilate ammonia to grow, they may experience metabolic problems due to nutrient limitations. Conversely, excess ammonia is commonly associated with eutrophic conditions in water bodies and toxicity to some organisms. Further, nitrous oxide (N 2 O) a molecule involved in the environmental cycling of ammonia is considered a potential ‘greenhouse gas’ which can also destroy stratospheric ozone. Because of these adverse effects, ammonia is frequently considered a pollutant in aquatic systems.

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Ammonia

Burgess¹

2004

Water Encyclopedia

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Trend analysis of water quality in some rivers with different degrees of development within the São Paulo State, Brazil

Groppo¹,

Moraes²,

Beduschi³

et al. 2008

River Research & Apps

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Time series of dissolved oxygen (DO), biochemical oxygen demand (BOD), nitrate, total phosphorus, chloride, ammonia and faecal coliforms (FC), monitored by CETESB ('Companhia de Tecnologia de Saneamento Ambiental'), in the period from 1979 to 2001, were analysed in seven river basins located in the São Paulo State, one of the most developed regions in Brazil. The selected rivers, Piracicaba, Mogi-Guaçu, Turvo Grande, Peixe, Aguapeí, São José dos Dourados and Alto Paranapanema have different degrees of development concerning industrial, agricultural and population growth. Trend analysis methodology was based on graphical exploratory analysis followed by confirmation through statistical tests. Results showed impoverishment of the water quality conditions in most of the studied basins, represented by the positive trends of the parameters (BOD, nitrogens, total phosphorus, clorate and FC) and negative trend of the parameter (DO). Among the analysed basins, the Piracicaba River is the most severely affected with higher variations in the magnitude followed by the basins of the Mogi-Guaçu, Turvo Grande, Peixe and Aguapeí Rivers. On the other hand, the Alto Paranapanema and São José dos Dourados basins are the least affected.

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Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary

Gao

Song

et al. 2007

Chin. J. Ocean. Limnol.

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Long-term Trends and Temporal Heterogeneity of Water Quality in Tidally Mixed Estuarine Waters

Cited by 31 publications

References 10 publications

Ammonia

Ammonia

Trend analysis of water quality in some rivers with different degrees of development within the São Paulo State, Brazil

Spatial distribution and diurnal variation of chemical oxygen demand at the beginning of the rainy season in the Changjiang (Yangtze) River Estuary

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