Trace Element Contaminants in Sediments From the Noaa National Status and Trends Programme Compared to Data From Throughout the World
| Autor: | Thomas P. O'Connor, Adriana Y. Cantillo |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category Ecology Trace element Sediment Estuary Atmospheric sciences Standard deviation Data set Log-normal distribution General Earth and Planetary Sciences Environmental science Geometric mean Extreme value theory Ecology Evolution Behavior and Systematics General Environmental Science |
| Zdroj: | Chemistry and Ecology. 7:31-50 |
| ISSN: | 1029-0370 0275-7540 |
| DOI: | 10.1080/02757549208055431 |
| Popis: | The National Oceanic and Atmospheric Administration's (NOAA) National Status and Trends (NS&T) Programme has analyzed samples of surface sediment collected at almost 300 coastal and estuarine sites throughout the United States since 1984. the overall distributions for concentrations of each element are approximately lognormal allowing a definition of geometric means and of “high” concentrations as those exceeding the mean plus one standard deviation of the lognormal distribution. Those mean and “high” concentrations should be useful for comparing the NS&T data set and with other reports on sediment contamination. A world-wide data set, constructed from data in the literature, was summarized in an identical manner. It was found, after excluding locally extreme values, that the NS&T and world-wide data sets yielded very similar mean and “high” concentrations for Cu, Ni, Pb and Zn. Chromium was the sole element showing higher summary statistics in the NS&T data set, a result attributed to NS&T sampl... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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