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<div class="ref-description"> + <div class="ref-description section level2"> <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> - <pre class="usage"><span class='fu'>GUS</span>(<span class='no'>...</span>) - -<span class='co'># S3 method for numeric</span> -<span class='fu'>GUS</span>(<span class='no'>DT50</span>, <span class='no'>Koc</span>, <span class='no'>...</span>) - -<span class='co'># S3 method for chent</span> -<span class='fu'>GUS</span>( - <span class='no'>chent</span>, - <span class='kw'>degradation_value</span> <span class='kw'>=</span> <span class='st'>"DT50ref"</span>, - <span class='kw'>lab_field</span> <span class='kw'>=</span> <span class='st'>"laboratory"</span>, - <span class='kw'>redox</span> <span class='kw'>=</span> <span class='st'>"aerobic"</span>, - <span class='kw'>sorption_value</span> <span class='kw'>=</span> <span class='st'>"Kfoc"</span>, - <span class='kw'>degradation_aggregator</span> <span class='kw'>=</span> <span class='no'>geomean</span>, - <span class='kw'>sorption_aggregator</span> <span class='kw'>=</span> <span class='no'>geomean</span>, - <span class='no'>...</span> -) - -<span class='co'># S3 method for GUS_result</span> -<span class='fu'><a href='https://rdrr.io/r/base/print.html'>print</a></span>(<span class='no'>x</span>, <span class='no'>...</span>, <span class='kw'>digits</span> <span class='kw'>=</span> <span class='fl'>1</span>)</pre> - - <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2> - <table class="ref-arguments"> - <colgroup><col class="name" /><col class="desc" /></colgroup> - <tr> - <th>...</th> - <td><p>Included in the generic to allow for further arguments later. Therefore -this also had to be added to the specific methods.</p></td> - </tr> - <tr> - <th>DT50</th> - <td><p>Half-life of the chemical in soil. Should be a field + <div class="section level2"> + <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2> + <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">GUS</span><span class="op">(</span><span class="va">...</span><span class="op">)</span></span> +<span></span> +<span><span class="co"># S3 method for numeric</span></span> +<span><span class="fu">GUS</span><span class="op">(</span><span class="va">DT50</span>, <span class="va">Koc</span>, <span class="va">...</span><span class="op">)</span></span> +<span></span> +<span><span class="co"># S3 method for chent</span></span> +<span><span class="fu">GUS</span><span class="op">(</span></span> +<span> <span class="va">chent</span>,</span> +<span> degradation_value <span class="op">=</span> <span class="st">"DT50ref"</span>,</span> +<span> lab_field <span class="op">=</span> <span class="st">"laboratory"</span>,</span> +<span> redox <span class="op">=</span> <span class="st">"aerobic"</span>,</span> +<span> sorption_value <span class="op">=</span> <span class="st">"Kfoc"</span>,</span> +<span> degradation_aggregator <span class="op">=</span> <span class="va">geomean</span>,</span> +<span> sorption_aggregator <span class="op">=</span> <span class="va">geomean</span>,</span> +<span> <span class="va">...</span></span> +<span><span class="op">)</span></span> +<span></span> +<span><span class="co"># S3 method for GUS_result</span></span> +<span><span class="fu"><a href="https://rdrr.io/r/base/print.html" class="external-link">print</a></span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span>, digits <span class="op">=</span> <span class="fl">1</span><span class="op">)</span></span></code></pre></div> + </div> + + <div class="section level2"> + <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2> + <dl><dt>...</dt> +<dd><p>Included in the generic to allow for further arguments later. Therefore +this also had to be added to the specific methods.</p></dd> + + +<dt>DT50</dt> +<dd><p>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.</p></td> - </tr> - <tr> - <th>Koc</th> - <td><p>The sorption constant normalised to organic carbon. Gustafson +be conducted under use conditions.</p></dd> + + +<dt>Koc</dt> +<dd><p>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).</p></td> - </tr> - <tr> - <th>chent</th> - <td><p>If a chent is given with appropriate information present in its -chyaml field, this information is used, with defaults specified below.</p></td> - </tr> - <tr> - <th>degradation_value</th> - <td><p>Which of the available degradation values should -be used?</p></td> - </tr> - <tr> - <th>lab_field</th> - <td><p>Should laboratory or field half-lives be used? This +(and if the reference concentration would be in soil or in porewater).</p></dd> + + +<dt>chent</dt> +<dd><p>If a chent is given with appropriate information present in its +chyaml field, this information is used, with defaults specified below.</p></dd> + + +<dt>degradation_value</dt> +<dd><p>Which of the available degradation values should +be used?</p></dd> + + +<dt>lab_field</dt> +<dd><p>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.</p></td> - </tr> - <tr> - <th>redox</th> - <td><p>Aerobic or anaerobic degradation data</p></td> - </tr> - <tr> - <th>sorption_value</th> - <td><p>Which of the available sorption values should be used? +field half-lives obtained under actual use conditions should be used.</p></dd> + + +<dt>redox</dt> +<dd><p>Aerobic or anaerobic degradation data</p></dd> + + +<dt>sorption_value</dt> +<dd><p>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.</p></td> - </tr> - <tr> - <th>degradation_aggregator</th> - <td><p>Function for aggregating half-lives</p></td> - </tr> - <tr> - <th>sorption_aggregator</th> - <td><p>Function for aggregation Koc values</p></td> - </tr> - <tr> - <th>x</th> - <td><p>An object of class GUS_result to be printed</p></td> - </tr> - <tr> - <th>digits</th> - <td><p>The number of digits used in the print method</p></td> - </tr> - </table> - - <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2> - - <p>A list with the DT50 and Koc used as well as the resulting score - of class GUS_result</p> - <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2> +be Koc values at a concentration of 1 mg/L in the water phase.</p></dd> + + +<dt>degradation_aggregator</dt> +<dd><p>Function for aggregating half-lives</p></dd> + + +<dt>sorption_aggregator</dt> +<dd><p>Function for aggregation Koc values</p></dd> + +<dt>x</dt> +<dd><p>An object of class GUS_result to be printed</p></dd> + + +<dt>digits</dt> +<dd><p>The number of digits used in the print method</p></dd> + +</dl></div> + <div class="section level2"> + <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2> + + +<p>A list with the DT50 and Koc used as well as the resulting score + of class GUS_result</p> + </div> + <div class="section level2"> + <h2 id="references">References<a class="anchor" aria-label="anchor" href="#references"></a></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 class="col-md-3 hidden-xs hidden-sm" id="sidebar"> - <h2>Contents</h2> - <ul class="nav nav-pills nav-stacked"> - <li><a href="#arguments">Arguments</a></li> - <li><a href="#value">Value</a></li> - <li><a href="#references">References</a></li> - </ul> - - <h2>Author</h2> + </div> + <div class="section level2"> + <h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author"></a></h2> <p>Johannes Ranke</p> - </div> -</div> + </div> + + </main><aside class="col-md-3"><nav id="toc"><h2>On this page</h2> + </nav></aside></div> - <footer> - <div class="copyright"> - <p>Developed by Johannes Ranke.</p> + <footer><div class="pkgdown-footer-left"> + <p></p><p>Developed by Johannes Ranke.</p> </div> -<div class="pkgdown"> - <p>Site built with <a href="https://pkgdown.r-lib.org/">pkgdown</a> 1.4.1.</p> +<div class="pkgdown-footer-right"> + <p></p><p>Site built with <a href="https://pkgdown.r-lib.org/" class="external-link">pkgdown</a> 2.0.7.</p> </div> - </footer> - </div> + </footer></div> + - </body> -</html> - + </body></html> |