Arsenic species in weathering mine tailings and biogenic solids at the Lava Cap Mine Superfund Site, Nevada City, CA

Foster, Andrea L; Ashley, Roger P; Rytuba, James J

doi:10.1186/1467-4866-12-1

Table 1 Selected major and trace element dissolved constituents in water from several locations in the LCMS

From: Arsenic species in weathering mine tailings and biogenic solids at the Lava Cap Mine Superfund Site, Nevada City, CA

Analyte	pH	SpC¹	DO²	Alk³	Fe _total	Fe²⁺	Fe³⁺⁴	As_{total inorganic}	As³⁺	As⁵⁺_{by difference}	As⁵organic	Ca	Cl	SO₄
Units	-log[H+]	μS⁶	mg/L	mg/L	mg/L	mg/L	mg/L	μg/L	μg/L	μg/L	μg/L	mg/l	mg/L	mg/L
Detection Limit	±0.1	±1%	varies⁷	±5%	0.002	0.002	0.002	0.012	0.012	0.012	0.012	0.3	0.08	0.05
LCD, Mine Adit
99	7.3	417	1	151	0.719	0.676	0.043	459	183	276	n.d	66.8	1.3	58
00	7.2	413	0.8	147	0.769	0.679	0.09	355	126	229	0.10	65.3	0.9	66
Lost Lake Sites
LL5
99	8.5	74.0	8	28.9	0.451	0.047	0.404	66.8	9.66	57.1	1.68	7.15	3.7	1.8
99-PW⁸	7.0	188	n.d.	83.7	10.7	7.02	3.68	3250	3250	0	0.95	26.3	6.5	0.6
00	9.4	43.1	8	12.6	0.088	0.01	0.078	17.9	1.31	16.59	1.51	2.90	3.3	1.4
00-PW	n.d.	164	n.d.	n.d.	0.845	0.605	0.24	45.1	25.9	19.2	0.76	22.0	5	10
00-R⁹	7.0	103	5	37.9	0.399	0.076	0.323	36.8	29.8	7.0	n.d	11.3	5	1.9
LL6
99	8.6	71.0	8	27.9	0.401	0.026	0.375	86.7	16.2	70.5	1.68	6.8	3.6	1.6
00-R	8.5	95.6	7	40.1	0.51	0.039	0.471	44.1	5.90	38.2	1.32	8.2	4.8	1.3
99-PW	7.2	275	n.d	n.d.	7.01	5.53	1.48	31.3	36.7	0	5.33	n.d.	n.d.	n.d.
00-PW	n.d.	204	n.d	n.d.	0.923	0.877	0.046	38.1	26.5	11.6	0.58	31.0	4	9.3
LL12
99	8.0	71.0	8	25.8	0.379	0.072	0.307	65.8	4.4	61.4	1.44	6.6	3.6	1.7
99-PW	7.0	285	n.d.	145	16.5	14.3	2.2	1580	2209¹⁰	0	0.65	32.4	7.1	0.5
00	7.1	39.9	n.d.	12.1	0.075	0.01	0.065	9.08	1.73	7.35	0.91	2.8	3.4	1.4
00-PW	n.d	412	n.d.	n.d.	7.80	7.429	0.371	1090	566	524	1.66	48.0	6.2	5.0
00-R	7.3	95.7	6	36.6	0.406	0.028	0.378	36.1	5.03	31.07	1.17	9.0	4.8	1.2
00-R-PW	7.7	339	1	164	0.859	0.854	0.005	2050	1880	170	1.70	34.0	7.5	0.6
LL2, Pond In tailings
99	7.8	372	8	194	0.008	b.d	0.008	440	3.1	437	n.d	65.5	0.9	3.0
99-R	8.1	362	7	183	0.008	0.004	0.004	1340	6.1	133	n.d	59.5	1.0	1.9
00	7.6	374	7	199	0.018	0.008	0.010	614	4.38	609.62	3.11	59.1	0.6	2.0
00-R	7.6	362	7	182	0.009	0.005	0.004	533	5.64	527	0.74	62.7	0.7	2.3
LL1 Seep at base of Lost Lake Dam
98	6.7	186	1	79.9	5.74	5.24	0.5	78.6	0.97	77.6	b.d	19.6	1.8	7.4
99	6.2	62	5	22.3	0.053	0.052	0.001	1.1	0.8	0.3	n.d	7.90	1.3	3.6
99-R	6.5	88	0.3	77.8	5.53	5.5	0.03	92.4	97.2	0	n.d	18.7	1.9	6.1
99-R2	6.5	178	0.4	78.8	5.15	4.51	0.64	92.4	77.9	14.5	b.d	19.2	2.2	6
00	6.7	198	0.1	89.1	6.251	5.345	0.906	61.8	69.6	0	0.07	20.5	1.7	9.4
00-R	6.6	188	0.2	78.5	5.77	5.78	0	85.1	85.0	0.1	b.d.	21.7	2.4	6.8
LL10 approximately 75 meters downstream of LL1
99	7.0	158	5	71.1	1.77	1.56	0.21	43.2	42.4	0.8	b.d	19.7	2.2	5.8
LL8 Background site upstream of mining impact
98	7.0	37.7	6	13.5	0.005	b.d.	0.005	0.098	0.025	0.073	b.d	3.4	1.6	2.3
99	6.5	38	8	12.8	b.d.	b.d.	b.d.	0.091	0.019	0.072	b.d	3.1	1.6	2.3
00-R	6.8	39.8	8	15.7	b.d	n.d.	n.d.	0.159	n.d.	0.159	b.d	3.3	1.8	2.2

Analytical methods are described in the text. Estimated lower limits of detection 5s method blank values are given for each analyte except pH, specific conductivity, and alkalinity (standard error given).¹ Specific conductivity; ² Dissolved oxygen; ³. Alk = alkalinity, caclulated as CaCO₃; ⁴ determined by difference; ⁵ including mono-, di-, and tri-methyl arsenic compounds as well as other unidentified arsenic species; ⁶ μS = microSiemens; ⁷ ± 0.1 when value is ≤ 1.0; ± 1.0 when value is ≥1.0; ⁸ PW = pore water, extracted from sediment cores by centrifugation; ⁹R = repeat(not replicate) determination (same year, different collection date); ¹⁰ Due to analytical error, As(III) values are occasionally greater than the total inorganic As value, especially when the proportion of As(III) is near 100%.

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ISSN: 1467-4866

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