CSEMP assessment of arsenic in sediment at Forth Estuary
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 40.73 | 42.01 | -17.36 | 34.73 | |||
linear | 2 | 42.14 | 44.60 | -17.07 | 34.14 | 0.583 | 1 | 0.4453 |
smooth (df = 2) | 3 | 41.26 | 45.43 | -15.63 | 31.26 | 2.883 | 1 | 0.0895 |
smooth (df = 3) | 4 | 42.22 | 48.77 | -15.11 | 30.22 | 1.039 | 1 | 0.3081 |
smooth (df = 4) | 5 | 43.35 | 53.15 | -14.68 | 29.35 | 0.870 | 1 | 0.3510 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2017 | 2.7491 | 2.8762 | 0.12711 | 0.16545 | 0.768 | 0.4542 |
last 20 years | 2000 | 2017 | 2.7491 | 2.8762 | 0.12711 | 0.16545 | 0.768 | 0.4542 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 17.747 | 25.000 | 0.3426 | 0.0983 | 3.486 | 0.0017 |
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 : Forth_Estuary_seSF (Forth Estuary)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020
Station : Forth_Estuary_seSF (Forth Estuary)
Determinand : Arsenic
Units : mg kg -1 dry weight normalised to 5% aluminium
Data extraction : 30 April 2020