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Hassan等将光谱纯碳棒经处理制成了对铜试剂-二乙基二硫代氨基甲酸盐(DDC)敏感的电极,以此作为指示电极,NaDDC作滴定剂,在乙醇-水溶液中可分步滴定Cu~(2+)、Ni~(2+)、Zn~(2+)、Cd~(2+)等金属离子。我们发现Ag_2S晶膜电极对DDC有特别敏感的响应。以该电极为指示电极,NaDDC为滴定剂,在50-75％的乙醇溶液中可分步滴定Cu~(2+)、Ni~(2+)、Zn~(2+)、Pb~(2+)、Cd~(2+)、Th~(4+)等金属离子。滴定突跃较Hassan的更为显著。Cu~2+浓度低至2μg/ml亦能测定。用该方
Hassan et al. Treated the pure spectral carbon rods with DDC-sensitive electrode as the indicator electrode and NaDDC as titrant in ethanol-water solution The titration of Cu ~ (2 +), Ni ~ (2 +), Zn ~ (2 +), Cd ~ (2+) and other metal ions was performed in a stepwise manner. We found that the Ag_2S film electrode has a particularly sensitive response to DDC. Using the electrode as the indicator electrode and NaDDC as titrant, titration of Cu 2+, Ni 2+, Zn 2+, Pb 2+ in 50-75% +), Cd ~ (2 +), Th ~ (4 +) and other metal ions. Titration jump is more significant than Hassan. Cu ~ 2 + concentrations as low as 2μg / ml can be measured. Use the party