Spatial Variability of Metals in Surface Water and Sediment in the Langat River and Geochemical Factors That Influence Their Water-Sediment Interactions

Table 6

Descriptive statistics of heavy metal concentrations (mg/kg) in sediment samples at Langat River (𝑛=90).

	Minimum	Maximum	Mean	SD	CV (%)	Average shale value	CCME	CCME
							(ISQG)	(PEL)
As	4.47	30.04	16.19	7.14	44.11	1.70	5.90	17.00
Cd	0.02	0.18	0.06	0.03	48.12	0.10	0.60	3.50
Co	0.87	4.66	2.10	0.86	41.51	24.00	—	—
Cr	4.31	29.04	15.88	6.85	43.15	126.00	37.30	90.00
Ni	2.33	8.25	4.47	1.69	37.94	56.00	—	—
Pb	5.57	55.71	30.44	11.77	38.66	14.80	35.00	91.30

SD: standard deviation, CV: coefficient of variance.
Average shale values (Wedepohl, 1995).
Interim Sediment Quality Guideline (ISQG) and Probable Effect Level (PEL) by CCME: Canadian Council of Ministers of the Environment; Canadian Sediment Quality Guidelines for the Protection of Aquatic Life (2002).