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All pieces of metal wire were removed from the water bottles 270 minutes after the start of the test to measure the residual amount of Cu left in the water after treatment. Slightly higher amounts of Cu (0.075 ± 0.0003 mg/L) were detected in the water bottles treated with Cu compared to the bottles not treated with Cu (Table 1). Combined treatment of the Cu and SySu gave the highest level of Cu measured (0.095 ± 0.0044 mg/L) among all treatments (Table 1). The amount of Ag detected in all the treatment fluctuated around the detection limit of 0.001 mg/L (Table 1).

Table 1

Concentration of dissolved Cu and Ag in water after removal of the metal wires after 270 min. Data represent mean values ± SE of three replicates and for means in the same column, different letters indicate significant differences among treatments using Tukey's test at P < 0.05

TreatmentCu concentration (mg/L)Ag concentration (mg/L)
Dark 0.004 ± 0.002d 0.001 ± 0.000a 
SySu 0.003 ± 0.0003d 0.001 ± 0.000a 
Cu 0.075 ± 0.0003b 0.001 ± 0.000a 
Cu + SySu 0.095 ± 0.0044a 0.001 ± 0.000a 
Ag 0.003 ± 0.0007d 0.001 ± 0.000a 
Cu + Ag 0.054 ± 0.0167c 0.001 ± 0.000a 
TreatmentCu concentration (mg/L)Ag concentration (mg/L)
Dark 0.004 ± 0.002d 0.001 ± 0.000a 
SySu 0.003 ± 0.0003d 0.001 ± 0.000a 
Cu 0.075 ± 0.0003b 0.001 ± 0.000a 
Cu + SySu 0.095 ± 0.0044a 0.001 ± 0.000a 
Ag 0.003 ± 0.0007d 0.001 ± 0.000a 
Cu + Ag 0.054 ± 0.0167c 0.001 ± 0.000a 

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