Mapping saline water intrusion into the coastal aquifer with geophysical and geochemical techniques: the University of Lagos campus case (Nigeria)

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Table 2 Summary of trace elements and heavy metals contents (μg/l) of water samples obtained from wells and boreholes around the dumpsite

Trace element/heavy metal	Range (ppb)	Mean	Standard deviation	Lagoon water (ppb)	USEPA standard (2002, 2009) (a, b, c, d)
Br	7-951	304.68	230.68	32866
Pb	0.1-76.8	24.93	23.65	39	10^d
Al	11-1331	251.95	347.28	306	50^c
Mn	24.41-348.37	96.56	70.97	146	^b50-300^b
Ni	2.4-30.1	11.38	7.6	34	20^d
Fe	<10-463	117.14	110.18	1000	300^c,d
As	<0.5-1.1	0.68	0.19	50	10^a,d

a – USEPA maximum contaminant Level; b – NYSDOH Maximum Contaminant Level; c – USEPA Secondary Maximum Contaminant Level; d – National Primary Drinking Water Standard.