Difference between revisions of "Infant's dioxin exposure"
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* Ovariables initiated 19.5.2017 [http://en.opasnet.org/en-opwiki/index.php?title=Special:RTools&id=pWQh3psj0Kmmf632] | * Ovariables initiated 19.5.2017 [http://en.opasnet.org/en-opwiki/index.php?title=Special:RTools&id=pWQh3psj0Kmmf632] | ||
+ | * Updated 30.5.2017 [http://en.opasnet.org/en-opwiki/index.php?title=Special:RTools&id=L6vVc0qwbJbTFkVF] | ||
<rcode name="initiate"> | <rcode name="initiate"> | ||
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dependencies = data.frame( | dependencies = data.frame( | ||
Name = c( | Name = c( | ||
− | " | + | "expoRaw", # Mother's exposure to dioxin (pg/d) |
"t0.5", # Half-life of dioxin in mother (d) | "t0.5", # Half-life of dioxin in mother (d) | ||
"f_ing", # Fraction of dioxin ingested by mother that is actually absorbed | "f_ing", # Fraction of dioxin ingested by mother that is actually absorbed | ||
Line 67: | Line 68: | ||
), | ), | ||
formula = function(...) { | formula = function(...) { | ||
− | out <- | + | out <- expoRaw * f_ing * t0.5 / log(2) # Body burden in mother after long constant exposure |
out <- out * f_mtoc / BF # Dioxin concentration in child | out <- out * f_mtoc / BF # Dioxin concentration in child | ||
out <- log(out + 0.1) # Convert to logarithm for ERF compatibility (avoid log(0)) | out <- log(out + 0.1) # Convert to logarithm for ERF compatibility (avoid log(0)) | ||
− | + | ||
# Technical conversion | # Technical conversion | ||
out <- out[out$Exposure_agent == "TEQ" , ] | out <- out[out$Exposure_agent == "TEQ" , ] |
Revision as of 08:02, 30 May 2017
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Question
How to measure infant's dioxin exposure due to fetal period and breast feeding?
Answer
Mother's exposure at level 100 pg /d (fairly typical amount) will lead to child's TEQ concentration of 44 pg /g fat (logTEQ 3.8).
Rationale
Inputs
Obs | Parametre | Value | Description |
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1 | TEQ half-life | 2737.5 | t0.5: 7.5 * 365, Dioxin half-life in adults (d) |
2 | TEQ fraction absorbed | 0.8 | f_ing: 0.80, Fraction of dioxin ingested that is actually absorbed (-) |
3 | TEQ fraction to child | 0.1 - 0.25 | f_mtoc: 0.25, Fraction of mother's dioxin burden that enters the child during breast-feeding in 6 mo. Alaluusua et Vartiainen (-) |
4 | Body fat in infant | 1580 | BF: 0.2 * (7.692+8.141) / 2, body fat amount in the infant at six months of age (g) [[:op_en:Body weight of 0-24 months old Finnish children]]. |