Figure 7 | Scientific Reports

Figure 7

From: A novel method of rapid detection for heavy metal copper ion via a specific copper chelator bathocuproinedisulfonic acid disodium salt

Figure 7

Establishment of standard paper strips based on Cu-BCS-AgNPs. (A) Metal specificity assay of BCS-AgNPs. 6.0 mg/L indicated metal ion was added into the BCS-AgNPs system to observe color change. (B) Interference assay of other metal ions. 6.0 mg/L indicated metal ion was mixed with Cu+ in the BCS-AgNPs system. (C) Standard solutions of Cu-BCS-AgNPs were prepared under optimized reaction conditions with indicated concentrations of CuSO4. (D) The absorbance ratios of Cu-BCS-AgNPs at A490/A410 were calculated to obtain the standard curve of Cu-BCS-AgNPs. (E) Paper strips (filter paper, 0.5 cm × 0.5 cm) were soaked in standard solutions of Cu-BCS-AgNPs, dried for 1 min and visualized against a white background.

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