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Table 6

Risk assessment calculation showing lifetime average daily dose (LADD), hazard quotient (HQ) and cancer risk for heavy metals present in drinking water of SIE

NiPbCrCdZn
LADD 
Location 1 2.1 × 10−4 7.6 × 10−3 3.4 × 10−2 3.4 × 10−6 3.1 × 10−4 
Location 2 1.6 × 10−4 13 × 10−3 1.8 × 10−2 1.1 × 10−6 2.1 × 10−4 
Location 3 1.8 × 10−4 8.6 × 10−3 2.1 × 10−2 0.69 × 10−6 24 × 10−4 
Location 4 2.1 × 10−4 7.6 × 10−3 3.4 × 10−2 3.4 × 10−6 3.1 × 10−4 
RfD 0.02 0.004 1.5 0.001 0.3 
Hazard quotient 
Location 1 5.1 × 10−3 1.4 2.2 × 10−2 3.3 × 10−3 3.7 × 10−4 
Location 2 10 × 10−3 1.9 2.3 × 10−2 3.4 × 10−3 10 × 10−4 
Location 3 8.2 × 10−3 3.2 1.2 × 10−2 1.1 × 10−3 6.9 × 10−4 
Location 4 9.0 × 10−3 2.1 1.4 × 10−2 6.9 × 10−3 80 × 10−4 
HI 33 × 10−3 8.6 7.1 × 10−2 8.5 × 10−3 100 × 10−4 
Total hazard index (HI) 8.7   
Cancer risk 
Location 1 9.4 × 10−5 4.7 × 0−5 1.6 × 10−2 4.9 × 10−6 – 
Location 2 19 × 10−5 6.5 × 10−5 1.7 × 10−2 5.2 × 10−6 – 
Location 3 15 × 10−5 11 × 10−5 91 × 10−2 1.7 × 10−6 – 
Location 4 16 × 10−5 7.3 × 10−5 1.1 × 10−2 1.0 × 10−6 – 
Slope factor 0.91 0.0085 0.5 1.5 – 
Sum 59 × 10−5 29 × 10−5 93 × 10−2 13 × 10−6 – 
Total cancer risk 93 × 10−2   
NiPbCrCdZn
LADD 
Location 1 2.1 × 10−4 7.6 × 10−3 3.4 × 10−2 3.4 × 10−6 3.1 × 10−4 
Location 2 1.6 × 10−4 13 × 10−3 1.8 × 10−2 1.1 × 10−6 2.1 × 10−4 
Location 3 1.8 × 10−4 8.6 × 10−3 2.1 × 10−2 0.69 × 10−6 24 × 10−4 
Location 4 2.1 × 10−4 7.6 × 10−3 3.4 × 10−2 3.4 × 10−6 3.1 × 10−4 
RfD 0.02 0.004 1.5 0.001 0.3 
Hazard quotient 
Location 1 5.1 × 10−3 1.4 2.2 × 10−2 3.3 × 10−3 3.7 × 10−4 
Location 2 10 × 10−3 1.9 2.3 × 10−2 3.4 × 10−3 10 × 10−4 
Location 3 8.2 × 10−3 3.2 1.2 × 10−2 1.1 × 10−3 6.9 × 10−4 
Location 4 9.0 × 10−3 2.1 1.4 × 10−2 6.9 × 10−3 80 × 10−4 
HI 33 × 10−3 8.6 7.1 × 10−2 8.5 × 10−3 100 × 10−4 
Total hazard index (HI) 8.7   
Cancer risk 
Location 1 9.4 × 10−5 4.7 × 0−5 1.6 × 10−2 4.9 × 10−6 – 
Location 2 19 × 10−5 6.5 × 10−5 1.7 × 10−2 5.2 × 10−6 – 
Location 3 15 × 10−5 11 × 10−5 91 × 10−2 1.7 × 10−6 – 
Location 4 16 × 10−5 7.3 × 10−5 1.1 × 10−2 1.0 × 10−6 – 
Slope factor 0.91 0.0085 0.5 1.5 – 
Sum 59 × 10−5 29 × 10−5 93 × 10−2 13 × 10−6 – 
Total cancer risk 93 × 10−2   
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