Heavy Metals in Water and Sediment: A Case Study of Tembi River

Table 2

Variations of average of heavy metals concentration in Tembi River sediments in different seasons (mg/kg).

Heavy metals	Sampling point	Sampling time
		Summer 2011	Autumn 2011	Winter 2011	Spring 2012
Cd	1	14±0.7	10±0.5	10±0.5	24±1.00
	2	40±1.1	20±1.5	14±0.5	24±0.5
Cr	1	57±1.5	40±0.5	28±2.0	42±1.1
	2	74±0.5	70±2.0	11±1.0	67±4.0
Cu	1	70±1.1	50±1.0	37±1.5	49±1.0
	2	100±2.6	66±1.0	40±1.7	54±1.0
Fe	1	250±6.0	230±1.0	220±1.0	230±0.5
	2	280±3.0	234±2.0	210±0.5	233±1.05
Mn	1	715±1.00	310±16	310±11	302±12
	2	820±2.5	310±5.0	278±5.0	341±9.0
Ni	1	107±2.0	63±3.2	52±2.9	129±11
	2	150±3.6	80±7.6	87±2.5	143±7.0
Pb	1	240±3.4	198±2.3	141±4.0	151±5.0
	2	270±0.5	236±2.0	178±3.3	210±2.0
Zn	1	54±2.0	30±1.5	24±2.0	32±1.0
	2	74±2.0	30±1.5	21±2.0	38±1.0

1: upstream; 2: downstream.