Table 1.

Total copper concentration of cotton samples determined by inductively coupled plasma-atomic emission spectrometry ^a (ICP-AES).

Sample Description	Digested Fabric Copper (Total) mg/L	Calc. Total Copper Per Fabric (mg/g)	% Add-On b
5 mM CuCl2·2H2O + 125 mM Asc. Acid	190.8	3.31	-
2 mM CuCl2·2H2O + 125 mM Asc. Acid	82.4	1.51	0.25
2 mM CuCl2·2H2O + 50 mM Na. Asc.	225.2	4.20	0.52
5 mM CuCl2·2H2O + 125 mM Na. Asc.	756	14.64	0.75
2 mM CuCl2·2H2O + 10 mM Na. Asc.	170	3.23	1.2
2 mM CuCl2·2H2O + 10 mM Asc. Acid	152.8	2.53	0.96
Cotton c control	0.52	0.01
Untreated brown cotton d	0.72	0.01

^a Copper total was determined after microwave acid digestion by ICP-AES according to EPA method 200.7 and reported in mg/L; ^b Add-on percent calculated for samples 1–4 after rinsing fabric and 24 h equilibration; samples 5–6 add-on percent calculated after 24 h equilibration; ^c Untreated hydroentangled upland white cotton (unbleached); ^d Untreated brown cotton variety B-14.