Chlorpyrifos amount absorbed, calculation

Two methods were used to calculate the amount of chlorpyrifos absorbed. First, the amount of chlorpyrifos absorbed was estimated by dividing the... 

L/min, and 43 L/min, respectively.4 Therefore, the amount of chlorpyrifos absorbed via the inhalation route for the female and male was calculated as ... 

Table 3 shows the estimated chlorpyrifos dose stemming from absorption of chlorpyrifos from the hands. The approximate average amount of chlorpyrifos absorbed was calculated to be 0.007 pg/kg. 

Estimation of dose from urinary metabolite analysis From the analysis of volunteer s urine for 3,5,6-TCP, the amount of absorbed chlorpyrifos was determined for each individual volunteer. Table 5 summarizes the calculated chlorpyrifos dose based on analysis of urine samples. The average chlorpyrifos dose was estimated to be 7.07 pg/kg, 182% of the dose estimated using physical techniques. 

The quantity of suspended dust inhaled and the intake of pesticides adsorbed to it may be calculated rather exactly, and the intake of pesticides from deposited dust via oral pathways may at least be roughly estimated. But data supporting the amount of chemicals absorbed through dermal contact of contaminated house dust and through direct contact to contaminated surfaces are still lacking. Semivolatile pesticides like chlorpyrifos will accumulate not only in house dust but also on toys and on sorband surfaces [134]. Data from the NHEXAS of Arizona support the importance of dermal penetration of semivolatile pesticides like chlorpyrifos and diazinon as a route of residential human exposure [116]. 

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