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

Table 2 Selected major and trace element constituents in sediments from several locations in the LCMS

Analyte	Al	Fe	P	S	As	Ca	Mn	Sb	Cd	Cu	Hg	Ni
Units	wt%	wt%	ppm	wt%	ppm	wt%	ppm	ppm	ppm	ppm	ppm	ppm
Detection Limit	0.005	0.004	10	0.01	2	0.013	0.71	±5%	0.69	1.4	0.01	0.26
97-LCD1 ¹	1.79	0.99	50	0.61	1155	0.86	265	38	0.5	67	n.d	13
97-LCD2 ¹	1.35	2.39	30	2.54	1130	0.71	295	2.4	9.5	9	0.4	11
97-LCD3 ¹	1.52	2.39	b.d.	2.81	561	0.02	5	1	34.5	45	n.d	11
97-LCD4 ¹	9.10	6.06	450	2.32	950	3.86	1290	3	0.5	88	0.02	2
LC3 (n = 6) ¹	5.13	2.26	b.d.	0.14	1043	3.10	731	16.12	5.17	35	1.01	18
99-LL2-ss1 ²	0.97	2.05	400	0.07	1640	1.76	590	n.r.	1.84	36.6	0.03	14
99-LL12-1cs ¹	7.10	4.16	70	0.45	1672	2.58	1030	15.2	6	60	0.82	34
99-LL6-cs ¹	5.82	3.40	60	0.5	2153	2.73	961	19	8	56	1.91	32
00-LL5-cs ¹	6.13	3.03	60	0.15	803	1.48	946	7.4	4	60	1.44	29
99-LL4-ss1 ²	0.99	1.78	420	0.07	514	1.68	615	n.r.	2.52	38	0.08	16
99-LL4-ss2 ²	0.76	1.54	380	0.07	546	1.77	470	n.r.	1.86	35.4	0.04	13
99-LL10-m ²	0.32	15³	1810	0.05	5140	0.39	1040	4.1	0.5	18	b.d.	5
00-LC1-m1 ²	0.33	4.05	3650	0.97	8740	2.28	370	1.5	0.86	38.6	0.13	9.2
00-LC1-m3 ²	1.93	15³	4070	0.36	10,000³	1.9	920	15.3	9.25	485	5.14	43.6
97-BCKGD ⁴	n.r.	n.r.	n.r.	n.r.	9.86	n.r.	n.r.	n.r.	2.06	62.8	b.d.	16.2

(ss), core samples (cs), microbial mats (m), and water filtrate (wf). Analytical methods are described in the text. Estimated lower limits of detection 5s method blank values are given for each analyte.¹Analysis by ICP-MS for a suite of 40 elements, HGAAS for As, Hg, and Sb, and LECO for S; ²ICP-AES/MS of 32 elements;; ⁵Analyte value exceeds upper limit of detection. As a conservative estimate, the upper detection limit is reported as the table entry and used in PCA (see text); ⁴ Analysis by ICP-AES (EPA method 6010).

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