Scientific Investigations Report 2006-5188
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5188
Table 9. Comparison of trend analysis results for trace-metal loads and flow-weighted concentrations based on the Mann-Kendall test and LOADEST regression analysis for four streamflow-gaging stations in the Spokane River basin, Idaho, water years 1991–2004.
[Abbreviations: Y, statistically significant downward trend at greater than 95-percent confidence level; N, no significant trend. –, comparison not made]
| Trace metal | Trace-metal loads | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pinehurst | Enaville | Harrison | Post Falls | ||||||||
| Mann-Kendall | LOADEST | Mann-Kendall | LOADEST | Mann-Kendall | LOADEST | Mann-Kendall | LOADEST | ||||
| Dissolved cadmium (DCd) | Y | Y | Y | Y | Y | Y | Y | Y | |||
| Total cadmium (TCd) | Y | Y | Y | Y | Y | Y | Y | Y | |||
| Dissolved lead (DPb) | Y1 | N | Y | Y | N | N | Y | Y | |||
| Total lead (TPb) | N | Y | Y1 | Y | N | Y | Y | Y | |||
| Dissolved zinc (DZn) | Y | Y | Y | Y | Y | Y | Y1 | Y | |||
| Total zinc (TZn) | Y | N | Y | Y | Y1 | Y | N | Y | |||
| Flow-weighted concentrations | |||||||||||
| Dissolved cadmium (DCd) | Y | – | Y | – | Y | – | Y | – | |||
| Total cadmium (TCd) | Y | – | Y | – | Y | – | Y | – | |||
| Dissolved lead (DPb) | Y | – | Y | – | N | – | Y | – | |||
| Total lead (TPb) | N | – | Y | – | N | – | Y | – | |||
| Dissolved zinc (DZn) | Y | – | Y | – | Y | – | Y | – | |||
| Total zinc (TZn) | Y | – | Y | – | Y1 | – | Y | – | |||
1Result was statistically significant at the 90- to 95-percent confidence level.
U.S.
Department of the Interior | U.S. Geological
Survey
Persistent URL: https://pubs.water.usgs.gov/sir20065188
Page Contact Information: Publications Team
Page Last Modified: Thursday, 01-Dec-2016 19:14:24 EST
