A History of Industrial Chemistry by F. Sherwood. Taylor PDF

By F. Sherwood. Taylor

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If the worker does not inhale carbon monoxide for the rest of the day away from the station, then the daily intake is 20 mg. In fact, the worker will probably also inhale smaller amounts for the rest of the day from other sources and thus receive a somewhat higher total daily dose. The dose may climb significantly if the worker happens to be a smoker. Food intakes are estimated in the same way. The amount of chemical per unit weight of food is multiplied by the daily intake of that food item to obtain the weight of chemical ingested each day.

Calculating doses for environmental chemicals is not much more complex. Suppose a local ground water supply has become contaminated with the widely used degreasing solvent, trichloroethylene (TCE). Environmental Protection Agency scientists have measured the extent of TCE contamination and found that the water contains 2 micrograms of TCE in each liter of water (how they know this will be discussed a little later). People living above the water have sunk wells, and adults are drinking an average of two liters of the water each day and their children are consuming one liter.

Five percent of the US population consumes, for example, more than 140 g of apples per day (about onethird of a pound), and these people would obviously be exposed to a greater dose of the pesticide than the average eater, assuming all apples had the same amount of pesticide residue (which is unlikely). 1 Information on food consumption rates and their distribution in the population is available, but it is far from perfect. Because people’s food consumption habits change over time, and because so much eating now takes place in restaurants and from foods prepared outside the home, it is becoming increasingly difficult to acquire reliable data on this subject.

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A History of Industrial Chemistry by F. Sherwood. Taylor

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