Question

Lead concentration in blood is considered alarming if it is

• A. 20 $\mu$g / 100 ml
• B. 30 $\mu$g / 100 ml
• C. 4-6 $\mu$ g/100 ml
• D. 10 $\mu$g/100ml.

Answer 1

Answer: (B)

30 $\mu$g / 100 ml

Answer 2

Lead (Pb) is released by combustion of petrol as tetra ethyl lead is used as antiknock in petrol. This lead is very harmful and causes plumbism or lead poisoning, which disturbs nervous system, liver, kidneys in adults and also causes brain damage in children. About 150 to 400 mg of lead is stored in the body of an average adult and blood levels average about 25 mg/100 ml. Increase to 70 mg/100 ml of blood is generally associated with clinical symptoms. Hence a level of30 mg/100 ml should be considered alarming.