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以标准比较法测定水样中的S~(2-)一般可获得满意的结果。当样品溶液含有较大量的共存离子,尤其是NH_4~+(>0.01M)或Mg~(2+)(>0.05M)时,S~(2-)电极对S~(2-)的响应电位比无NH_4~+或Mg~(2+)时,有明显正向偏移。如以标准比较法测定,必须作出相应NH_4~+或Mg~(2+)时标准曲线,这较麻烦。实验表明,即使共存有较大量的NH_4~+(～0.1M)或Mg~(2+)
The standard comparison method for the determination of S ~ (2-) in water samples generally gives satisfactory results. When the sample solution contains a large amount of coexisting ions, especially NH_4 ~ + (> 0.01M) or Mg ~ (2 +) (> 0.05M), the S ~ (2-) electrode response to S ~ Potential than no NH_4 ~ + or Mg ~ (2+), there is a significant positive shift. As determined by the standard comparison method, you must make the corresponding standard curve NH_4 ~ + or Mg ~ (2+), this is more troublesome. Experiments show that, even if a larger amount of NH 4 ~ + (~ 0.1M) or Mg 2+