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水中存在的硫化物包括溶解性的H_2S和HS~-、含在悬浮物中的酸溶性金属硫化物,以及几乎不溶解的铜、汞、银等硫化物。此外,还有含硫的有机化合物。当用絮凝和沉淀法把悬浮固体除去后,剩余的为溶解的硫化物。通常所测定的水中硫化物系指溶解性的H_2S和HS~-,以及酸溶性金属硫化物而言。 硫化物的测定方法已有很多的报道,属仪器测定方法的,如离子色谱法、间接原子吸收法、库仑滴定法、离子选择电极法、电流滴定法、电位滴定法、冷原子荧光法等。化学分析法,则有各种容量滴定法。在各种可见分光
Sulfides present in water include soluble H 2 S and HS ~ -, acid-soluble metal sulfides contained in suspended solids, and hardly dissolved copper, mercury, silver and other sulfides. In addition, sulfur-containing organic compounds. When the suspended solids are removed by flocculation and precipitation, the remaining sulfide is dissolved. The commonly measured sulphides in water refer to soluble H 2 S and HS ~ - as well as acid-soluble metal sulphides. Sulfide determination methods have been reported in many cases, which are the instrument determination methods, such as ion chromatography, indirect atomic absorption spectrometry, coulometric titration, ion selective electrode, current titration, potentiometric titration, cold atomic fluorescence spectrometry. Chemical analysis, there are a variety of volumetric titration. In a variety of visible light