CSEMP assessment of mercury in sediment at middle (Firth of Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 35.10 | 37.67 | -14.55 | 29.10 | |||
linear | 2 | 36.72 | 42.05 | -14.36 | 28.72 | 0.387 | 1 | 0.5341 |
smooth (df = 2) | 3 | 38.26 | 48.26 | -14.13 | 28.26 | 0.454 | 1 | 0.5003 |
smooth (df = 3) | 4 | 36.83 | 54.83 | -12.42 | 24.83 | 3.430 | 1 | 0.0640 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2006 | 2016 | -2.2258 | -2.3441 | -0.11835 | 0.18625 | -0.635 | 0.5429 |
last 20 years | 2006 | 2016 | -2.2258 | -2.3441 | -0.11835 | 0.18625 | -0.635 | 0.5429 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 0.09593 | 0.07000 | -0.3151 | 0.0912 | -3.455 | 0.9957 |
ERL | 0.09593 | 0.15000 | 0.4470 | 0.0912 | 4.900 | 0.0006 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in sediment
- Accessment criteria for metals in sediment
Media : Sediment (< 63 micron fraction)
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Firth_of_Clyde_(middle)_seSF, middle (Firth of Clyde)
Determinand : Mercury
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020