1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>GUS. pfm 0.3-1</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="author" content="
Johannes Ranke
">
<link href="css/bootstrap.css" rel="stylesheet">
<link href="css/bootstrap-responsive.css" rel="stylesheet">
<link href="css/highlight.css" rel="stylesheet">
<link href="css/staticdocs.css" rel="stylesheet">
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
processEscapes: true
}
});
</script>
<script type="text/javascript"
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>
</head>
<body>
<div class="navbar">
<div class="navbar-inner">
<div class="container">
<a class="brand" href="#">pfm 0.3-1</a>
<div class="nav">
<ul class="nav">
<li><a href="index.html"><i class="icon-home icon-white"></i> Index</a></li>
</ul>
</div>
</div>
</div>
</div>
<div class="container">
<header>
</header>
<h1>Groundwater ubiquity score based on Gustafson (1989)</h1>
<div class="row">
<div class="span8">
<h2>Usage</h2>
<pre><div>GUS(...)</div>
<div>"GUS"(DT50, Koc, ...)</div>
<div>"GUS"(chent, degradation_value = "DT50ref", lab_field = "laboratory", redox = "aerobic", sorption_value = "Kfoc", degradation_aggregator = geomean, sorption_aggregator = geomean, ...)</div>
<div>"print"(x, ..., digits = 1)</div></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">
<!-- <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>
</div>
<footer>
<p class="pull-right"><a href="#">Back to top</a></p>
<p>Built by <a href="https://github.com/hadley/staticdocs">staticdocs</a>. Styled with <a href="http://twitter.github.com/bootstrap">bootstrap</a>.</p>
</footer>
</div>
</body>
</html>
|
