Regional geochemical baseline concentration of potentially toxic trace metals in the mineralized Lom Basin, East Cameroon: a tool for contamination assessment

Table 2 Summary characteristics of stream sediment geochemical data and Se:Hg ratios in the lower Lom Basin (N = 55)

Element	Unit	Minimum	Median	Mean	Maximum	MAD	Std Dev	Variance	CV %	Skewness
Sc	µg/kg	2.11	129.97	211.75	1699.18	4.22	328.78	108,095.73	155.27	3.11
V	µg/kg	53.57	85.96	963.14	12,333.20	5.20	2365.99	5,597,892.54	245.65	3.28
Cr	µg/kg	13.58	39.18	763.93	10,052.57	1.26	1941.97	3,771,266.78	254.21	3.43
Mn	mg/kg	224.12	319.00	441.56	1441.56	5.86	273.94	75,040.66	62.04	2.10
Fe	mg/kg	12,109.19	22,678.94	28,325.12	159,319.95	6985.00	22,219.08	493,687,443.27	78.44	4.29
Co	µg/kg	0.03	0.47	92.85	1308.38	0.14	256.17	65,625.13	275.90	3.41
Ni	µg/kg	5.59	15.79	239.02	3125.54	0.19	607.61	369,194.94	254.21	3.35
Cu	µg/kg	12.19	211.18	362.64	3946.64	0.04	680.27	462,768.04	187.59	3.95
Zn	µg/kg	2.61	315.39	573.24	4657.72	18.39	1008.88	1,017,834.67	176.00	3.11
As	µg/kg	0.35	22.66	99.40	1178.11	20.05	249.26	62,129.44	250.75	3.21
Se	µg/kg	0.10	21.03	48.55	509.56	3.82	100.73	10,145.84	207.47	3.23
Cd	µg/kg	1.30	2.48	2.65	7.85	5.37	0.98	0.97	37.10	3.69
Hg	µg/kg	0.19	2.35	5.40	83.24	18.26	11.87	140.85	219.70	5.55
Pb	µg/kg	7.25	47.64	151.59	2215.78	2168.13	365.78	133,795.98	241.30	4.10
pH	–	3.60	6.40	6.38	7.10	–	0.51	0.25	7.99	− 3.17
Se:Hg	–	0.04	2.70	2.31	7.49	–	–	–	–	–

N number of sampling sites, MAD median absolute deviation, Std Dev standard deviation, CV coefficient of variation

ISSN: 1467-4866