Table 1.

Description and distribution of variables and models for dietary exposure assessment of OP residues in tea infusion

Compound	Variables	Definition	Assumption/distribution/formula	Source
OPs	Conc Qp	Concentration in methamidophos equivalents of OPs in tea infusion (detected value)	Lognorm (0.052, 4.636)a	Monitoring data
			Lognorm (0.003, 0.041)b
			Lognorm (0.003, 0.151)c
	Conc Qn	Concentration in methamidophos equivalents of OPs in tea infusion (undetected value)	Uniform (0, 0.105)a	Monitoring data
			Uniform (0, 0.044)b
			Uniform (0, 0.105)c
	Conc * Qp	Concentrationin in methamidophos equivalents of OPs in tea infusion (detected value)	Lognorm (0.038, 2.987)a	Monitoring data
			Lognorm (0.002, 0.019)b
			Lognorm (0.001, 0.019)c
	Conc * Qn	Concentration in methamidophos equivalents of OPs in tea infusion (undetected value)	Uniform (0, 0.447)a	Monitoring data
			Uniform (0, 0.235)b
			Uniform (0, 0.447)c
	Pp	Rate of sample with detectable	10.11%a	Calculated
			13.53%b
			6.20%c
	Pn	Rate of sample with undetectable	89.89%a	Calculated
			86.47%b
			93.80%c
	Conc QC	Concentration in methamidophos equivalents of OPs in tea infusion	Discrete (ConcQp: ConcQn, Pp: Pn)	Calculated
	TR	Transfer rate	87.4%	Based on the open scientific literatures to calculate
			22.1%
			2.8%
	Cons	The consumption of tea	Invgauss (3.772, 0.721)a	China National Nutrient and Health Survey
			Invgauss (4.474, 1.718)b
			Invgauss (11.532, 10.870)c
	BW	Body weight for tea consumers	Normal (55.1, 15.5)	China National Nutrient and Health Survey

For Conc_Qp and Conc_Qn mark with an asterisk (*), RPFs were calculated based on CED at 20% AChE inhibition in rat brain, IC for OPs is methamidophos

For Conc_Qp and Conc_Qn, RPFs were calculated based on BMDat 10% AChE inhibition in rat brain, IC for OPs is methamidophos

The 87.4, 22.1 and 2.8% were TRs of soluble OPs, moderately soluble OPs and low soluble OPs, respectively

^aNon-fermented tea

^bSemi-fermented tea

^cFermented tea