Calculations in Toxicology

Question 1

What does PPM stand for?

Answer 1

Parts per million

Question 2

What does PPB stand for?

Answer 2

Parts per billion

Question 3

What does PPT stand for?

Answer 3

Parts per trillion

Question 4

1 ppm equals what?

Answer 4

1 ppm = 1 mg (chemical)/kg (material)

Question 5

What is the conversion of 1 ppm to a percentage?

Answer 5

1 ppm = 1 mg/kg
= 0.000001 x 100
= 0.0001%

Question 6

How many places do you move the decimal point to convert from ppm to percentage?

Answer 6

4 to the left

Question 7

How many decimal places do you move the decimal point to convert percentage to ppm?

Answer 7

4 to the right

Question 8

How do you make a diluted solution from a concentrated stock solution?

Answer 8

mL needed = (% required dilution/% of the stock)) X (volume required in mL from the stock)

Question 9

How do you convert from (g)/ton in feed to ppm?

Answer 9

100 g/ton = 110 ppm

1 g/ton = 1.1 ppm

Question 10

What is the conversion from the level of drug in feed as ppm to toxicity (mg/kg)?

Answer 10

Toxicity (mg/kg) = (ppm in feed) X (% of feed consumed daily)

Question 11

What is the conversion from toxicity (mg/kg) to level in feed as ppm?

Answer 11

Level in feed (ppm) = (toxicity (mg/kg)) / (% of feed consumed daily)

Question 12

What is the most common method of expressing concentrations in veterinary toxicology?

Answer 12

Part per million (ppm) on weight/weight basis