CSEMP assessment of nickel in sediment at Celtic Deep
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 13.55 | 15.35 | -3.78 | 7.55 | |||
linear | 2 | 9.95 | 13.51 | -0.97 | 1.95 | 5.601 | 1 | 0.0179 |
smooth (df = 2) | 3 | 11.80 | 18.05 | -0.90 | 1.80 | 0.154 | 1 | 0.6946 |
smooth (df = 3) | 4 | 11.45 | 21.74 | 0.27 | -0.55 | 2.341 | 1 | 0.1260 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 1999 | 2018 | 3.394 | 3.946 | 0.5517 | 0.2006 | 2.750 | 0.0189 |
last 20 years | 1999 | 2018 | 3.394 | 3.946 | 0.5517 | 0.2006 | 2.750 | 0.0189 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 51.7 | 36.0 | -0.3620 | 0.1291 | -2.805 | 0.9914 |
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 : Severn_SeOpenSeaW_se01 (Celtic Deep)
Determinand : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Severn_SeOpenSeaW_se01 (Celtic Deep)
Determinand : Nickel
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020