From 12a31f4c130c551f82232d9ef7dfb608bd52c53f Mon Sep 17 00:00:00 2001 From: Johannes Ranke Date: Tue, 27 Sep 2016 23:00:48 +0200 Subject: Reorganise repository using standard package layout --- docs/GUS.html | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 171 insertions(+) create mode 100644 docs/GUS.html (limited to 'docs/GUS.html') diff --git a/docs/GUS.html b/docs/GUS.html new file mode 100644 index 0000000..cb4e10e --- /dev/null +++ b/docs/GUS.html @@ -0,0 +1,171 @@ + + + + +GUS. pfm 0.3-8 + + + + + + + + + + + + + + + +
+
+
+ pfm 0.3-8 +
+ +
+
+
+
+ + +
+
+ +
+ +

Groundwater ubiquity score based on Gustafson (1989)

+ +
+
+

Usage

+ 
GUS(...)
+
+# S3 method for numeric
+GUS(DT50, Koc, ...)
+
+# S3 method for chent
+GUS(chent, degradation_value = "DT50ref",
+  lab_field = "laboratory", redox = "aerobic", sorption_value = "Kfoc",
+  degradation_aggregator = geomean, sorption_aggregator = geomean, ...)
+
+# S3 method for GUS_result
+print(x, ..., digits = 1)
+ +

Arguments

+
+
...
+
Included in the generic to allow for further arguments later. Therefore +this also had to be added to the specific methods.
+
DT50
+
Half-life of the chemical in soil. Should be a field +half-life according to Gustafson (1989). However, leaching to the sub-soil +can not completely be excluded in field dissipation experiments and Gustafson +did not refer to any normalisation procedure, but says the field study should +be conducted under use conditions.
+
Koc
+
The sorption constant normalised to organic carbon. Gustafson +does not mention the nonlinearity of the sorption constant commonly +found and usually described by Freundlich sorption, therefore it is +unclear at which reference concentration the Koc should be observed +(and if the reference concentration would be in soil or in porewater).
+
chent
+
If a chent is given with appropriate information present in its +chyaml field, this information is used, with defaults specified below.
+
degradation_value
+
Which of the available degradation values should +be used?
+
lab_field
+
Should laboratory or field half-lives be used? This +defaults to lab in this implementation, in order to avoid +double-accounting for mobility. If comparability with the original GUS +values given by Gustafson (1989) is desired, non-normalised first-order +field half-lives obtained under actual use conditions should be used.
+
redox
+
Aerobic or anaerobic degradation data
+
sorption_value
+
Which of the available sorption values should be used? +Defaults to Kfoc as this is what is generally available from the European +pesticide peer review process. These values generally use a reference +concentration of 1 mg/L in porewater, that means they would be expected to +be Koc values at a concentration of 1 mg/L in the water phase.
+
degradation_aggregator
+
Function for aggregating half-lives
+
sorption_aggregator
+
Function for aggregation Koc values
+
x
+
An object of class GUS_result to be printed
+
digits
+
The number of digits used in the print method
+
+ +
+

Value

+ +

+A list with the DT50 and Koc used as well as the resulting score + of class GUS_result +

+ +
+ +
+

Description

+ +

The groundwater ubiquity score GUS is calculated according to +the following equation +$$GUS = \log_{10} DT50_{soil} (4 - \log_{10} K_{oc})$$

+ +
+ +
+

References

+ +

Gustafson, David I. (1989) Groundwater ubiquity score: a simple +method for assessing pesticide leachability. Environmental +toxicology and chemistry 8(4) 339–57.

+ +
+
+
+ + + + +

Author

+ +Johannes Ranke + + +
+
+ + +
+ + \ No newline at end of file -- cgit v1.2.1