Conversions And Units

Question 1

Give the appropriate ranges for relative toxicity. (Extremely toxic, highly toxic, moderately toxic, slightly toxic, practically nontoxic, relatively harmless)

Answer 1

Extremely toxic < 1mg/kg
Highly toxic 1-50 mg/kg
Moderately toxic 50-500 mg/kg
Slightly toxic 500-5,000 mg/kg
Practically nontoxic 5,000-15,000 mg/kg
Relatively harmless > 15,000 mg/kg

Question 2

1 ppm= ?

Answer 2

1 mg (chemical)/kg (material)

1ppm= 1mg/g
1ppm= 1mg/1,000,000mg

Question 3

1 ppb= ?

Answer 3

1 ppb= 1 microgram/kg

Question 4

1 ppt= ?

Answer 4

1 ppt= 1 ng/kg

Question 5

Conversion of ppm to percentage

1 ppm= 1 mg/1 kg

What is the %?

Answer 5

1 ppm= 1 mg/1 kg
1 ppm= 1 mg/ 1,000,000 kg
1 ppm= 0.000001
To get to % multiply by 100
0.000001 x 100 = 0.0001%

Or use equation: 1 ppm= (1 mg/1,000,000 mg) x 100
ppm to percentage- move 4 decimal pts to the left

Question 6

Conversion from % to ppm

Answer 6

Move 4 decimal pts to the right

Question 7

100 g/ton= ?ppm

Answer 7

100 g/ton= 110 ppm