From: Determination of Cu (II) ions using sodium salt of 4-phenylsemicarbazone 1,2-naphthoquinone-4-sulfonic acid in natural and industrial environments
Sample
Contained
Found
Ceramics
0.2745 g
0.2720 ± 0.0041 g
Bronze
0.1090 g
0.1037 ± 0.0053 g
Water
0.0400 mg/L
0.0396 ± 0.0004 mg/L