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What is The Iron requirement in pregnant and non-pregnant women respectively: and explain in detail?
The total content of iron in an adult body is 3-5 g. 
About 70% of this occurs in the erythrocytes of blood as a constituent of hemoglobin. 
At least 5% of body iron is present in myoglobin of muscle. 
Heme is the most predominant iron-containing substance. 
lt is a constituent of several proteins/enzymes (hemoproteins, hemoglobin, myoglobin, cytochromes, xanthine oxidase, catalase, tryptophan pyrrolase, peroxidase). 
Certain other proteins contain non-heme iron e.g. transferrin, ferritin, hemosiderin.

Dietary requirements:
Adult man - 10 mg/day
Menstruating woman - 18 mg/day
Pregnant and lactating woman - 40 mg/day
Key Concept:
Iron requirement for pregnant woman is around 40mg/day and in menstruating woman is around 18mg/day
Ref : Textbook of Biochemistry, Satyanarayana