Table 7.

The mean Hazard Quotient (HQ) of heavy metals for adults and children through drinking water ingestion (HQ_ing) and dermal contact (HQ_der).

HQing and HQder of individuals toxic elements
Sub-City	Individuals		Fe	Zn	Cu	Mn	Ni	Cr	Pb	As	Total
AK	Adult	HQing	3.60 × 10−3	3.5 × 10−3	2.50 × 10−3	3.00 × 10−3	1.5 × 10−3	1.67 × 10−2	3.43 × 10−2	1.67 × 10−1	2.20 × 10−1
	Child	HQing	6.60 × 10−3	6.43 × 10−3	4.25 × 10−3	5.00 × 10−3	2.5 × 10−3	3.00 × 10−2	6.57 × 10−2	3.00 × 10−1	4.04 × 10−1
	Adult	HQder	1.25 × 10−6	5.50 × 10−7	4.00 × 10−7	3.70 × 10−6	4.95 × 10−8	6.75 × 10−5	6.10 × 10−5	2.56 × 10−5	1.60 × 10−4
	Child	HQder	1.74 × 10−6	7.66 × 10−7	5.56 × 10−7	5.14 × 10−6	6.89 × 10−8	9.40 × 10−5	8.50 × 10−5	3.56 × 10−5	2.23 × 10−4
GU	Adult	HQing	2.04 × 10−2	6.7 × 10−3	3.25 × 10−3	2.70 × 10−2	-	-	4.29 × 10−2	3.30 × 10−2	1.36 × 10−1
	Child	HQing	3.73 × 10−2	1.2 × 10−2	5.75 × 10−3	4.95 × 10−2	-	-	7.71 × 10−2	6.60 × 10−2	2.49 × 10−1
	Adult	HQder	7.10 × 10−6	1.06 × 10−6	5.47 × 10−7	3.51 × 10−5	-	-	7.38 × 10−5	5.96 × 10−6	1.23 × 10−4
	Child	HQder	9.88 × 10−6	1.48 × 10−6	7.62 × 10−7	4.88 × 10−5	-	-	1.03 × 10−4	8.29 × 10−6	1.72 × 10−4

THQ = HQing + HQder of individuals elements
Sub-City	Individuals		Fe	Zn	Cu	Mn	Ni	Cr	Pb	As	HI
AK	Adult	THQ	3.60 × 10−3	3.50 × 10−3	2.25 × 10−3	3.00 × 10−3	1.50 × 10−3	1.67 × 10−2	3.43 × 10−2	1.67 × 10−1	2.31 × 10−1
	Child	THQ	6.60 × 10−3	6.43 × 10−3	4.25 × 10−3	5.00 × 10−3	2.50 × 10−3	3.00 × 10−2	6.57 × 10−2	3.00 × 10−1	4.20 × 10−1
GU	Adult	THQ	2.04 × 10−2	6.77 × 10−3	3.25 × 10−3	2.70 × 10−2	-	-	4.29 × 10−2	3.30 × 10−2	1.34 × 10−1
	Child	THQ	3.73 × 10−2	1.24 × 10−2	5.75 × 10−3	4.95 × 10−2	-	-	7.71 × 10−2	6.67 × 10−2	2.49 × 10−1

Ak = Akaki-kality and GU = Gullele