在水体中,氰和硫常有共存,而在环境监测中,多为分别测定,所以水中微量氰、硫的连续测定就具有一定的现实意义。鉴于银与硫、氰形成难溶化合物,抑制了[Ag(Phen)_2]_2BPR三元络合物的形成,而这种抑制作用在一定范围内与硫、氰量成线性关系,兼之氰又能被甲醛所掩蔽,这样,测定剩余的银就可以间接得到相应的 In water, cyanide and sulfur often coexist, while in environmental monitoring, mostly for the determination, so the continuous determination of trace amounts of cyanide and sulfur in water has a certain practical significance. In view of silver and sulfur, cyanide formed insoluble compounds, inhibited the [Ag (Phen) _2] _2BPR ternary complex formation, and this inhibition in a certain range and sulfur, a linear relationship between the amount of cyanide, and both cyanide Can be masked by formaldehyde, so that the determination of the remaining silver can be indirectly obtained