From e3bc264df69f892e9ad990be22d3ec1b22041daa Mon Sep 17 00:00:00 2001 From: Johannes Ranke Date: Wed, 17 Jun 2020 13:37:59 +0200 Subject: TSCF estimation equations, update docs Briggs et al. (1982) and Dettenmaier et al. (2009) --- docs/reference/TSCF.html | 181 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 181 insertions(+) create mode 100644 docs/reference/TSCF.html (limited to 'docs/reference/TSCF.html') diff --git a/docs/reference/TSCF.html b/docs/reference/TSCF.html new file mode 100644 index 0000000..b635ba2 --- /dev/null +++ b/docs/reference/TSCF.html @@ -0,0 +1,181 @@ + + + + + + + + +Estimation of the transpiration stream concentration factor — TSCF • pfm + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
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Estimation of the transpiration stream concentration factor

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The FOCUS groundwater guidance (FOCUS 2014, p. 41) states that a reliable measured +log Kow for neutral pH must be available in order to apply the Briggs +equation. It is not clarified when it can be regarded reliable, but the +equation is stated to be produced for non-ionic compounds, suggesting that +the compound should not be ionogenic (weak acid/base) +or ionic.

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TSCF(log_Kow, method = c("briggs82", "dettenmaier09"))
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Arguments

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log_Kow

The decadic logarithm of the octanol-water partition constant

method

Short name of the estimation method.

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Details

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The Dettenmaier equation is given to show that other views on the subject exist.

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References

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FOCUS (2014) Generic Guidance for Tier 1 FOCUS Ground Water Assessments. + Version 2.2, May 2014 +Dettenmaier EM, Doucette WJ and Bugbee B (2009) Chemical hydrophobicity and uptake +by plant roots. Environ. Sci. Technol 43, 324 - 329

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Examples

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plot(TSCF, -1, 5, xlab = "log Kow", ylab = "TSCF", ylim = c(0, 1.1))
TSCF_2 <- function(x) TSCF(x, method = "dettenmaier09")
+curve(TSCF_2, -1, 5, add = TRUE, lty = 2)
legend("topright", lty = 1:2, bty = "n",
+  legend = c("Briggs et al. (1982)", "Dettenmaier et al. (2009)"))
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+ + + + + + + + -- cgit v1.2.1