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对水(饮用水、工业用水及工业排放水等)及土壤中微量氰化物的测定,目前多用双吡唑酮和吡啶-联苯胺比色法、以试银灵为指示剂的硝酸银容量法、离子选择电极法等。在这些方法中常用蒸馏-吸收法分离干扰元素,当试样中含铁氰化物或亚铁氰化物时会造成分析结果偏高。由于目前生产的氰离子电极尚不稳定,离子选择电极法灵敏度不高。采用EC-1型测氰仪具有操作简便、结果准确、灵敏度高等优点,水中所含的S~(2-)、Hg~+、Cu~(2+)、Fe~(2+)等干扰离子可用去干扰离子试剂去除。仪器测量范围为0—1.25微克氰。主要试剂氢化钾标准溶液:称取0.2560克分析纯氰化钾,用0.01M氢氧化钠溶液溶解并稀释于100毫升容量瓶中。此溶液1毫升约含1毫克氰离子,其准确浓度用硝酸银标准溶液标定;去干扰试剂:0.5
Determination of trace amounts of cyanide in water (drinking water, industrial water and industrial discharge water) and soils, the current use of double pyrazolone and pyridine - benzidine colorimetric method to silver silver as indicator silver nitrate capacity method , Ion selective electrode method. Often distillation-absorption methods are used to separate the interfering elements in these methods. High concentrations of ferroferricyanide or ferrocyanide in the sample result in high analytical results. Due to the current production of cyanide ion electrode is not stable, ion-selective electrode sensitivity is not high. The EC-1 Cyanometric Cytometer has the advantages of simple operation, accurate results and high sensitivity. The interference ions such as S 2 -, Hg ~ +, Cu 2+, Fe 2+ in water Can be used to interfere with the removal of ionic agents. Instrument measurement range of 0-1.25 micrograms of cyanide. The main reagent potassium hydride standard solution: Weigh 0.2560 grams of analytical grade potassium cyanide, dissolved with 0.01M sodium hydroxide solution and diluted in 100 ml volumetric flask. This solution 1 ml contains about 1 mg of cyanide ions, the exact concentration of silver nitrate standard solution calibration; to interference reagents: 0.5