CSEMP assessment of benzo[a]anthracene in sediment at Garroch Head (Clyde)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | 82.24 | 83.44 | -38.12 | 76.24 | |||
linear | 2 | 78.13 | 80.42 | -35.07 | 70.13 | 6.108 | 1 | 0.0135 |
smooth (df = 2) | 3 | 79.15 | 82.99 | -34.57 | 69.15 | 0.987 | 1 | 0.3205 |
smooth (df = 3) | 4 | 80.79 | 86.79 | -34.40 | 68.79 | 0.351 | 1 | 0.5534 |
smooth (df = 4) | 5 | 79.74 | 88.65 | -32.87 | 65.74 | 3.056 | 1 | 0.0804 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 2000 | 2018 | 5.554 | 4.531 | -1.0228 | 0.3818 | -2.679 | 0.0165 |
last 20 years | 2000 | 2018 | 5.554 | 4.531 | -1.0228 | 0.3818 | -2.679 | 0.0165 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 92.88 | 16.00 | -1.7587 | 0.2511 | -7.004 | 1.0000 |
ERL | 92.88 | 261.00 | 1.0332 | 0.2511 | 4.115 | 0.0004 |
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_FirthCMiddleOffshor_se06, Garroch Head (Clyde)
Determinand : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : Clyde_FirthCMiddleOffshor_se06, Garroch Head (Clyde)
Determinand : Benzo[a]anthracene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020