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本文叙述了 Ag_2S 电极的试制,特别对不同的 Ag_2S沉淀方法作了比较。实验证明制备的电极能测定 Ag~+的下限～1×10~(-7)M;S~=～5×10_(-6)M。Ag~+的响应最低极限可达10~(-25)M。应用该电极直接测定纯 Pb 试样中 Ag,与原子吸收测定法结果一致(9.4×10~(-4)%),在电位滴定中可作 Cl~-(或 Br~-,I~-)的指示电极。由于硫化银是低阻抗的离子导电的晶体物质,有极低的溶解度,并且用通常的压片技术很容易获得致密、光洁的薄膜片,故可做成硫、银离子选择电极。根
This paper describes the trial production of Ag_2S electrode, in particular, the different deposition methods of Ag_2S are compared. Experiments show that the prepared electrode can measure the lower limit of Ag ~ + ~ 1 × 10 ~ (-7) M and S ~ = ~ 5 × 10_ (-6) M. Ag ~ + response to the minimum limit of up to 10 ~ (-25) M. The direct determination of Ag in pure Pb samples by this electrode was consistent with the results of atomic absorption spectrometry (9.4 × 10 -4%). Cl - (or Br ~ -, I ~ -) could be used in potentiometric titration. The indicator electrode. Since silver sulfide is a low-resistance, ion-conducting crystal material with very low solubility and is easy to obtain a dense, smooth film sheet by the usual tableting technique, it can be used as a sulfur and silver ion selective electrode. root