The influence of groundwater chemistry on arsenic concentrations and speciation in a quartz sand and gravel aquifera)

Table I Arsenic concentrations and related groundwater chemical conditions from sampling points in the anoxic zone of the sewage plume.

Altitude (meters to sea level)	Turbidity (NTU)^a	PH	Fe (μM)	P (μM)	Ast (μM)	As(III) (μM)	As(V)^b (μM)
	F625 sampled June 4, 2003
3.1	0.6	6.34	69	18.3	0.038	0.018	0.020
2.2	0.7	6.66	244	61	0.203	0.143	0.060
1.4	0.7	6.66	234	84	0.196	0.131	0.065
0.6	0.7	6.71	207	91	0.189	0.062	0.127
-0.2	2.8	6.70	175	64	0.166	0.114	0.052
-1.0	1.4	6.73	102	34.9	0.158	0.100	0.058
-1.5	5.4	6.75	148	44.0	0.157	0.111	0.046
-1.9	1.2	6.78	141	51	0.159	0.111	0.048
-2.7	0.9	6.63	236	93	0.192	0.135	0.057
	F343 sampled June 18, 2002
2.9	0.3	6.48	250	24.3	0.174	0.101	0.073
2.0	0.3	6.54	330	90	0.197
1.1	0.8	6.56	280	77	0.165
0.2	0.3	6.50	255	49.2	0.143	0.073	0.070
-0.7	1.0	6.58	214	41.2	0.152

ISSN: 1467-4866