TABLE XIII

Levels of Extracted Elements, Rubber Elastomers

Extraction Details						Amount of Element Extracted, μg/g (ppm)^⁵
Sample	Solvent	Volume (mL)	Temp. (°C)	Time	Weight (g)	Al	B	Ba	Ca	Fe	Mg	Na	P	S	Si	Zn
1^²	pH 3	200	121	1 h	60.0	0.02	0.14	—^³	0.14	0.03	1.7	—^³	—^³	0.21	0.60	0.09
	Water	200	121	1 h	60.0	0.02	0.97	—^³	0.16	—^³	1.0	0.83	—^³	—^³	0.83	0.04
	pH 9	200	121	1 h	60.0	0.17	1.4	—^³	0.08	—^³	1.1	NA^⁶	NA^⁶	0.73	9.0	0.01
	E/W	200	55	3 days	60.0	—^³	0.04	—^³	0.32	—^³	1.7	—^³	—^³	—^³	0.43	0.03
2	pH 3	150	55	3 days	36.0	0.54	—^³	—^³	0.42	—^³	23	0.29	—^³	3.5	3.5	10
	pH 9	150	55	3 days	36.0	0.25	—^³	—^³	—^³	—^³	7.5	NA^⁶	NA^⁶	10	2.7	0.21
	E/W	150	55	3 days	36.0	—^³	0.04	—^³	—^³	—^³	4.2	—^³	—^³	10	3.3	—^³
3^²	pH 3	200	121	1 h	60.0	0.04	0.08	—^³	0.67	0.03	0.06	—^³	—^³	0.16	3.0	0.50
	Water	200	121	1 h	60.0	0.03	0.70	—^³	0.53	—^³	0.07	0.60	—^³	—^³	3.7	0.53
	pH 9	200	121	1 h	60.0	—^³	0.60	—^³	0.30	—^³	0.03	NA^⁶	NA^⁶	0.29	5.7	0.06
	E/W	200	55	3 days	60.0	—^³	0.10	—^³	0.57	—^³	0.06	—^³	—^³	—^³	3.3	0.22
4^²	pH 3	150	55	4 days	15.0	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³
	pH 9	150	55	4 days	15.0	—^³	—^³	—^³	—^³	—^³	—^³	NA^⁶	NA^⁶	—^³	—^³	—^³
	E/W	150	55	4 days	15.0	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³	—^³
5	pH 3	200	121	1 h	7.0	0.66	5.4	—^³	—^³	—^³	—^³	5.4	—^³	57	2.6	110
	pH 9	200	121	1 h	7.0	1.7	23	—^³	—^³	—^³	—^³	NA^⁶	NA^⁶	490	150	6.9
	E/W	200	55	3 days	7.0	—^³	—^³	—^³	—^³	—^³	—^³	2.6	—^³	210	3.7	8.9
6^²	pH 3	150	55	4 days	15.6	—^³	—^³	—^³	1.2	—^³	—^³	—^³	—^³	—^³	0.10	—^³
	pH 9	150	55	4 days	15.6	—^³	—^³	—^³	1.3	—^³	—^³	NA^⁶	NA^⁶	—^³	6.3	—^³
	E/W	150	55	4 days	15.6	—^³	0.48	—^³	0.67	—^³	—^³	0.58	—^³	—^³	0.38	—^³
7^²	E/PBS^⁴	200	55	15 days	15.0	—^³	—^³	—^³	1.3	—^³	1.3	NA^⁶	NA^⁶	—^³	—^³	—^³
8^²	E/PBS^⁴	200	55	15 days	15.0	—^³	21.3	—^³	1.6	—^³	32	NA^⁶	NA^⁶	—^³	120	—^³
9	E/W	500	60^⁷	1 day^⁷	270	—^³	—^³	—^³	1.3	—^³	10	0.19	—^³	16	0.19	—^³

Notes: ¹The solvent types denoted with the pH were aqueous solutions prepared at that pH. Solvents at pH 3 and below were KCl/HCl mixtures. Solvents at pH above 3 were dilute phosphate buffers. W = purified water. E/W = 40/60 (v/v) ethanol/water.
↵2 This material was gamma-irradiated.
↵3 — = not present in the sample in reportable quantities.
↵4 E/PBS = 25/75 ethanol/phosphate buffered saline.
↵5 Elements that were not present in the extracts at reportable levels, in addition to those listed in this table, included Ag, As, Be, Cd, Co, Cr, Cu, Ge, Li, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Ti, V, and Zr.
↵6 NA = not applicable. As Na and P were components of the buffer used in these solvents, extractable quantities of these elements could not be ascertained.
↵7 The initial storage of 60 °C for 1 day was followed by additional storage at 40 °C for 6 months.