CSEMP assessment of dibenzothiophene in sediment at Holy Loch (Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 50.61 | 52.00 | -22.31 | 44.61 | |||
linear | 2 | 46.79 | 49.46 | -19.40 | 38.79 | 5.820 | 1 | 0.0158 |
smooth (df = 2) | 3 | 47.56 | 52.11 | -18.78 | 37.56 | 1.230 | 1 | 0.2675 |
smooth (df = 3) | 4 | 49.10 | 56.30 | -18.55 | 37.10 | 0.461 | 1 | 0.4973 |
smooth (df = 4) | 5 | 48.67 | 59.56 | -17.34 | 34.67 | 2.430 | 1 | 0.1191 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2018 | 3.408 | 2.615 | -0.7932 | 0.3014 | -2.632 | 0.0197 |
last 20 years | 2000 | 2018 | 3.408 | 2.615 | -0.7932 | 0.3014 | -2.632 | 0.0197 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
ERL | 13.67 | 190.00 | 2.6320 | 0.2015 | 13.061 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
PAH (parent) data
PAH (parent) assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for pah_(parent) in sediment
- Accessment criteria for pah_(parent) in sediment
Media : Sediment (unsieved)
Station : Clyde_FirthCInnerDunoon_se06, Holy Loch (Clyde)
Determinand : Dibenzothiophene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Clyde_FirthCInnerDunoon_se06, Holy Loch (Clyde)
Determinand : Dibenzothiophene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020