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-Johannes Ranke
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-
- <h1>Groundwater ubiquity score based on Gustafson (1989)</h1>
-
-<div class="row">
- <div class="span8">
- <h2>Usage</h2>
- <pre><span class="functioncall"><a href='GUS.html'>GUS</a></span><span class="keyword">(</span><span class="symbol">...</span><span class="keyword">)</span>
-
-<span class="comment"># S3 method for numeric</span>
-<span class="functioncall"><a href='GUS.html'>GUS</a></span><span class="keyword">(</span><span class="symbol">DT50</span><span class="keyword">,</span> <span class="symbol">Koc</span><span class="keyword">,</span> <span class="symbol">...</span><span class="keyword">)</span>
-
-<span class="comment"># S3 method for chent</span>
-<span class="functioncall"><a href='GUS.html'>GUS</a></span><span class="keyword">(</span><span class="symbol">chent</span><span class="keyword">,</span> <span class="argument">degradation_value</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="string">"DT50ref"</span><span class="keyword">,</span>
- <span class="argument">lab_field</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="string">"laboratory"</span><span class="keyword">,</span> <span class="argument">redox</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="string">"aerobic"</span><span class="keyword">,</span> <span class="argument">sorption_value</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="string">"Kfoc"</span><span class="keyword">,</span>
- <span class="argument">degradation_aggregator</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="symbol">geomean</span><span class="keyword">,</span> <span class="argument">sorption_aggregator</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="symbol">geomean</span><span class="keyword">,</span> <span class="symbol">...</span><span class="keyword">)</span>
-
-<span class="comment"># S3 method for GUS_result</span>
-<span class="functioncall"><a href='http://www.rdocumentation.org/packages/base/topics/print'>print</a></span><span class="keyword">(</span><span class="symbol">x</span><span class="keyword">,</span> <span class="symbol">...</span><span class="keyword">,</span> <span class="argument">digits</span>&nbsp;<span class="argument">=</span>&nbsp;<span class="number">1</span><span class="keyword">)</span></pre>
-
- <h2>Arguments</h2>
- <dl>
- <dt>...</dt>
- <dd>Included in the generic to allow for further arguments later. Therefore
-this also had to be added to the specific methods.</dd>
- <dt>DT50</dt>
- <dd>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.</dd>
- <dt>Koc</dt>
- <dd>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).</dd>
- <dt>chent</dt>
- <dd>If a chent is given with appropriate information present in its
-chyaml field, this information is used, with defaults specified below.</dd>
- <dt>degradation_value</dt>
- <dd>Which of the available degradation values should
-be used?</dd>
- <dt>lab_field</dt>
- <dd>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.</dd>
- <dt>redox</dt>
- <dd>Aerobic or anaerobic degradation data</dd>
- <dt>sorption_value</dt>
- <dd>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.</dd>
- <dt>degradation_aggregator</dt>
- <dd>Function for aggregating half-lives</dd>
- <dt>sorption_aggregator</dt>
- <dd>Function for aggregation Koc values</dd>
- <dt>x</dt>
- <dd>An object of class GUS_result to be printed</dd>
- <dt>digits</dt>
- <dd>The number of digits used in the print method</dd>
- </dl>
-
- <div class="Value">
- <h2>Value</h2>
-
- <p><dl>
-A list with the DT50 and Koc used as well as the resulting score
- of class GUS_result
-</dl></p>
-
- </div>
-
- <div class="Description">
- <h2>Description</h2>
-
- <p>The groundwater ubiquity score GUS is calculated according to
-the following equation
-$$GUS = \log_{10} DT50_{soil} (4 - \log_{10} K_{oc})$$</p>
-
- </div>
-
- <div class="References">
- <h2>References</h2>
-
- <p>Gustafson, David I. (1989) Groundwater ubiquity score: a simple
-method for assessing pesticide leachability. <em>Environmental
-toxicology and chemistry</em> <b>8</b>(4) 339–57.</p>
-
- </div>
- </div>
- <div class="span4 sidebar">
- <!-- <ul>
- <li>GUS</li><li>GUS.chent</li><li>GUS.numeric</li><li>print.GUS_result</li>
- </ul>
- <ul>
-
- </ul> -->
-
-
-
- <h2>Author</h2>
-
-Johannes Ranke
-
-
- </div>
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