Table 1. Average concentration (µg/L) of heavy metal in surface water of different sampling spots from the River Padma

Sampling spot	Amount of heavy metal (ug/L)
	Water						Surface sediments
	Zn	Mn	Cu	Cd	Cr	Pb	Ni	Zn	Mn	Cu	Cd	Cr	Pb	Ni
Shibganj, Chapai Nawabganj	7.88±1.57	10.71±1.56	5.10±2.94	1.75±1.07	5.85±1.84	5.38±1.02	3.21±0.96	12.75±2.99	21.28±3.96	8.02±0.85	1.89±0.07	6.29±1.51	5.13±0.62	2.16±1.04
Rajshahi City, Rajshahi	10.29±1.62	11.08±1.75	6.32±1.86	1.58±1.14	6.11±4.05	4.51±2.18	2.48±1.82	20.10±4.20	23.31±4.98	9.64±1.57	2.84±0.52	5.56±0.64	4.84±0.59	3.52±0.31
Irshardi, Pabna	8.69±1.31	10.52±1.43	6.21±1.39	0.87±0.56	4.75±3.87	4.45±1.62	2.81±0.08	18.29±3.85	20.72±4.65	6.52±1.83	1.28±0.86	4.74±1.19	4.79±0.98	2.48±0.43
Mean ± SD	8.95± 1.50	10.77±1.58	6.88±2.06	1.40±0.90	5.57±3.25	4.11±1.61	2.83±0.95	17.04±3.68	21.77±4.53	8.06±1.17	2.00±0.48	5.53±1.11	4.25±0.73	2.72±0.59
WHO (2011)	5,000	50	2,000	3	50	10	70	123	NV	25	6	25	NV	20
USEPA (2012)	5,000	NV	1,300	5	100	15	NV	110	30	25	6	25	40	16

NV, no criterion value.