CSEMP assessment of benzo[a]pyrene 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 | 48.82 | 50.21 | -21.41 | 42.82 | |||
linear | 2 | 46.26 | 48.92 | -19.13 | 38.26 | 4.566 | 1 | 0.0326 |
smooth (df = 2) | 3 | 46.58 | 51.12 | -18.29 | 36.58 | 1.678 | 1 | 0.1952 |
smooth (df = 3) | 4 | 48.03 | 55.23 | -18.02 | 36.03 | 0.545 | 1 | 0.4603 |
smooth (df = 4) | 5 | 48.07 | 58.96 | -17.03 | 34.07 | 1.963 | 1 | 0.1612 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2018 | 6.361 | 5.663 | -0.6988 | 0.3053 | -2.289 | 0.0381 |
last 20 years | 2000 | 2018 | 6.361 | 5.663 | -0.6988 | 0.3053 | -2.289 | 0.0381 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 287.9 | 30.0 | -2.2614 | 0.2045 | -11.056 | 1.0000 |
ERL | 287.9 | 430.0 | 0.4012 | 0.2045 | 1.962 | 0.0350 |
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 : Benzo[a]pyrene
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 : Benzo[a]pyrene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020