LINK TO THE ORIGINAL PAGE  CACHED IMAGE 01/11/2007  SAFE FOOD PACKAGING PORTAL 
getting started notations list of inputs parameter form search for D values/uncertainty/variability
QSPRMS WEBSERVER  PROBABILISTIC MODELING
MIGRARISK efficient pseudoMonteCarlo version (v. 1.2)
NAME  DESCRIPTION 

_F

food or food simulant 
_P

plastics or polymer 
_FP 
ratio in F and in P 
M

migrant or diffusant 
0

initial 
List of input parameters
(geometry,
thermodynamics, transport, initial concentration, contact time)
NAME  PHYSICAL PROPERTY 

l_P

typical/expected plastic thickness [ SI unit = m)]  TRUE THICKNESS = l_P x l_P* No safety value (must be measured) 
sl_P

normalized shape factor of the distribution of plastic thickness [ no unit)]  l_P* approx by a NORMAL distribution (mean=1, variance=sl_P^2) Leave 0 if no information 
L_FP

mass dilution factor [SI unit: kgF/kgP)]  NO SIDE EFFECT (1D TRANSPORT) = mass of F / mass of P No safety value (must be measured) 
K_FP

partition coefficient [SI unit: (kgM/kgF)/(kgM/kgP)]  DESORPTION EQUILIBRIUM OBEYS TO HENRY's LAW concentration in F divided the concentration in P at equilibrium Safety value = 1000 (almost complete extraction at equilibrium) 
D_P

typical/expected diffusion coefficient [SI unit: m2/s]  TRUE DIFFUSION COEFFICIENT = D_P x D_P* Safety value = must be [over]estimated or measured at a temperature higher than the conditions of use. For an overestimate, use: Piringer Calculator 
sD_P

normalized shape factor of the distribution of the diffusion coefficient [no unit]  D_P* approx by a LOGNORMAL distribution (mean 1, variance = sD_P^2) Safety value = 0.5 (0.2 convenient for most applications) 
Bi

dimensionless mass Biot number [no unit]  EXTERNAL MASS TRANSFER RESISTANCE DUE TO FOOD TEXTURE/ABSENCE OF STIRRING Safety value = 1000 (almost no external mass transfer resistance) 
C_P0

typical/expected initial concentration in P [SI unit: kgM/kgP]  TRUE INITIAL CONCENTRATION = C_P0 x C_P0* Safety value = 5000 ppm (maximum concentration for common additives) 
sC_P0

normalized shape factor of the distribution of the initial concentration in P [no unit]  C_P0* approx by a NORMAL distribution (mean 1, variance = sC_P0^2) Safety value = 0.2 
t

typical/expected contact time [SI unit s]  TRUE TIME = t x t* Default value = 10 days (according to monolayer regulation) 
st

normalized shape factor of the distribution of contact time [no unit]  t* approx by a WEIBULL distribution (mean, variance = st^2) Default value = 1.3 
©2006 by INRA\Olivier Vitrac