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硫化银膜构成的硫/银离子选择电极可用于硫和银等的分析,其电极性能已有一些研究。由于S~(2-)要水解,人们采用增加溶液碱度的办法促进S~(2-)离子的生成,以期提高电极检测硫的灵敏度,但仅能实测10~(-5)M〔S~(2-)〕。而该电极可响应的硫离子活度是10~(-25)M。我们初步研究了产生这种差别的原因,进而拟定了痕量硫的测试条件。主要仪器、试剂与实验方法仪器:PZ-8型直流数字电压表;pHS-2型酸度计;681型磁搅拌器;Neophot-2型显
Sulfur / silver ion selective electrode composed of silver sulfide film can be used for the analysis of sulfur and silver, the electrode performance has been some research. Because of S ~ (2-) to be hydrolyzed, increasing the alkalinity of the solution to promote the formation of S ~ (2-) ions in order to improve the sensitivity of the electrode to detect sulfur, but only 10 ~ (-5) M [S ~ (2-)]. The sulfur ion activity of the electrode is 10 ~ (-25) M. We initially studied the reasons for this difference, and then developed the test conditions of trace sulfur. Main instruments, reagents and experimental methods Instrument: PZ-8 DC digital voltmeter; PHS-2 pH meter; 681 magnetic stirrer; Neophot-2 type was significantly