CSEMP assessment of benzo[a]pyrene in sediment at Lough Foyle
Statistical analysis
Trend assessment
Analysis of variance
| Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
|---|---|---|---|---|---|---|---|---|
| mean | 1 | 129.89 | 131.89 | -61.94 | 123.89 | |||
| linear | 2 | 128.52 | 132.52 | -60.26 | 120.52 | 3.372 | 1 | 0.0663 |
| smooth (df = 2) | 3 | 122.48 | 129.63 | -56.24 | 112.48 | 8.034 | 1 | 0.0046 |
| smooth (df = 3) | 4 | 123.35 | 135.35 | -55.68 | 111.35 | 1.129 | 1 | 0.2880 |
Change in log concentration
| Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
|---|---|---|---|---|---|---|---|---|
| overall | 2000 | 2018 | 5.037 | 3.906 | -1.1311 | 0.4311 | -2.624 | 0.0276 |
| last 20 years | 2000 | 2018 | 5.037 | 3.906 | -1.1311 | 0.4311 | -2.624 | 0.0276 |
Status assessment
| Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
|---|---|---|---|---|---|---|
| BAC | 49.7 | 30.0 | -0.5047 | 0.3139 | -1.608 | 0.9288 |
| ERL | 49.7 | 430.0 | 2.1579 | 0.3139 | 6.875 | <0.0001 |
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for in sediment
- Accessment criteria for in sediment
Media : Sediment (< 63 micron fraction)
Station : MinchMalin_FoyleFaughanE_se01 (Lough Foyle)
Determinand : Benzo[a]pyrene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020
Station : MinchMalin_FoyleFaughanE_se01 (Lough Foyle)
Determinand : Benzo[a]pyrene
Units : μg kg-1 dry weight normalised to 2.5% organic carbon
Data extraction : 30 April 2020