用新试剂N-烯丙基-N′(对苯磺酸钠)硫脲鉴定Fe~(3+)和Ag~+

<正> 引言N-烯丙基-N’(对苯磺酸钠)硫脲是以异硫氰酸烯丙酯和对氨基苯磺酸为原料合成的。通过对该试剂性质的研究,发现该试剂能与 Ag~+,Cu~+、Hg~(2+)等在弱酸性或中性溶液中生成无色络合物,在碱性(NH_3、H_2O、NaOH 等)溶液中与 Ag~+生成有色(褐黄色或褐色)络合物;在酸性溶液(HAC,HCl,H_2SO_4、HNO_3等)中与 Fe~(3+)生成桔红色络合物,故考虑该试剂可以作为 Ag~+、Fe~(3+)的鉴定试剂。为此,我们做了一系列条件试验,

Using New Reagetn N-Allyl-N'-(Sodium p-benzene Sulfonate)Thioure fornDetermining Ag~+ and Fe~(3+)

According to the properties of the New Reagent N-allyl-N′-(Sodiume p-benzene Sulfonate)Thioure producing the orange red complexing with Fe~(3+) in acidity solution and producing the brown complexing with Ag~+ in basici ty solution,some conditional experiments have been done about the determination of Ag~+ and Fe~(3+) In these experiments it is found that the reagent can be used for determinat tion of Fe~3 and its medium range is wider than the classical method of tdtassium ferrocyanide and sul fornodanate and its selec tivity is also higher han these two methods.when it is used to determine Ag~+ both its sens- Sitivity and selectivity are higher than the chlorhydric acid method. pSatisfactory results arc also obtained in determining the unknown sample. So this New Reagent can be used as a new determining reagent of Fe~(3+) and Ag~+.