TABLE XIII

Levels of Extracted Elements, Rubber Elastomers, Continued

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
19^²	pH 3	200	121	1 h	38	—^³	—^³	—^³	—^³	—^³	—^³	0.68	—^³	2.1	—^³	1.4
	Water	200	121	1 h	38	0.04	—^³	—^³	—^³	—^³	—^³	0.68	—^³	4.7	0.84	0.04
	pH 9	200	121	1 h	38	0.11	6.1	—^³	—^³	—^³	—^³	NA^⁵	NA^⁵	383	38	—^³
	E/W	200	55	3 days	38	—^³	—^³	—^³	—^³	—^³	—^³	1.0	—^³	26	1.2	0.03
20	pH 2	10	55	15 days	1.8	0.95	0.23	0.22	1.4	—^³	19	—^³	—^³	—^³	2.0	—^³
	pH 9	10	55	15 days	1.8	—^³	5.6	—^³	0.72	—^³	13	NA^⁵	NA^⁵	15	30	—^³
	E/W	10	55	15 days	1.8	—^³	—^³	—^³	0.37	—^³	3.2	—^³	—^³	5.3	0.70	—^³
21	Water	200	121	1 h	7.0	—^³	4.0	—^³	—^³	—^³	—^³	5.3	—^³	24	36	36
22	Water	200	121	1 h	7.0	—^³	5.9	—^³	4.3	—^³	—^³	14	—^³	33	5.7	2.9

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.
⁴Elements that were not present in the extracts at reportable levels, in addition to those listed in this table, included Ag, As, Be, Bi, Cd, Co, Cr, Cu, Ge, Li, Mo, Mn, Ni, Pb, Sb, Se, Sn, Sr, Ti, V, and Zr, unless otherwise noted.
↵5 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.