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Table 3 Content of copper in objects (Р = 0.95)

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