[A]The daily intake rate of metals (DIR) was calculated by

the following equation:

DIR =C(metal) .D(food intake)/ B(average weight)

Where C(metal) is Heavy metal concentration in plants

(μg/g).D(food intake) is daily intake of vegetable (kg/person)

B(average weight) is average body weight.

{B}The average adult body weights were considered to be

55.9kg, while average daily vegetable intakes for adults is

considered to be 0.345 kg/person/day, respectively

[C]The true intake using the arithmetic mean according

to Parkhurst (1998) was calculated by multiplying

contaminant level i.e. (yearly intake of rice, cassava and

fruits multiplied by heavy metal contaminant for each of

the food items).

[C] In all the estimated or calculated levels

of lead , cadmium and nickel in the food samples yearly averages

as quoted by various workers were used .

[D] Two types of foods are commonly consumed :

(i) RICE& ORANGES(Primarily Indian diet

(Ii) Manihot spp&Bannana( For other countries)

[E]

(I) First type of diet:

Amount of Pb, Cd and Ni in Rice( mg/Kg)=61.17, 0.0 and 0.0

Pb,Cd and ,Ni In Citrusa(mg/g)= 0.69,0.24 and 0.0

(II)Second type of diet

Amount of Pb, Cd and ,Ni in Manihot spp ( mg/Kg)=0.33,0.10 and 0.24

Amount of Pb, Cd and ,Ni in Bannana ( mg/Kg)=0.46,0.0 and 0.0

[F]

(I) First Type of diet

Total Rice consumption/year=24.8Kg

Suppose Citrus fruit cosumed daily=200g

(II)Again in Second Type of diet

Total Manihot spp consumption/year=214Kg

Suppose Bannana frit cosumed daily=2oog

[H] Daily in take of the metals

(I)First Type of diet

[Pb]==24:8kg/365days x 61 .17 mg/kg

+ 200gx0:69mg/kg =3:53g/kg

[Cd]= 24:8kg/365days x0:0mg/kg+ 200gx0.24mg/kg =0.034g/Kg.

[Ni]= 24:8kg/365days x0:0mg/kg+ 200gx0.0mg/kg =0.0g/Kg.

(II)Second Type of diet

[ Pb ]= 214kg/365days x0:33mg/kg

+200gx0:46mg/kg= 19:42g/kg

[ Cd ]= 214kg/365days x0:10mg/kg

+200x0= o.049g/Kg

[ Ni ]= 214kg/365days x0:30mg/kg

+200 x0 = 0.18g/Kg

Note: These are the values of intake of the metals / day. Multiply by 7 to obtain per week.

Pls find reference to authenticate the answer

Research article

Heavy metals health risk assessment for population via consumption of food crops and fruits in Owerri, South Eastern, Nigeria

Orish Ebere Orisakwe1*, John Kanayochukwu Nduka2, Cecilia Nwadiuto Amadi1,Daniel Onyekachi Dike3 and Onyinyechi Bede3

You have to know first the allowable daily intake of each metal, so calculate from the average weight of a human and a ration of that food