应用自主研发的便携式多功能样品处理仪，按所选择的条件（空气流量为0.5 L·min^-1，加热时间为20 min），用氰化物预处理剂气热提取水样和食品中痕量氰化物，按此条件可使水体中氰化物浓缩富集5倍。将所得提取液移入显色管中，加入1 mol·L^-1 H₂SO₄溶液1滴，加水至5.0 mL，加入氰化物检测剂Ⅰ，摇匀，静置2 min后，加入氰化物检测剂Ⅱ，摇匀并静置20 min后，在水质检测仪上测定其c.v值。方法的检出限为0.003 mg·L^-1，测定值的相对标准偏差（n=6）均小于3.5%，按标准回收试验测得方法的回收率为92.5%~103%。方法可用于野外现场快速分析。

Trace amounts of cyanide in water samples and foodstuff were extracted by reaction with the CN^--pretreatment reagents in the self-made portable multi-functional sample processor under the gas-thermo-condition of air flow-rate of 0.5 L·min^-1 and time of heating of 20 min, by which the concentration of CN^- in water sample could be enriched and concentrated to the extent of 5 times. The extract containing CN^- was transferred to the coloration tube and after one drop of 1 mol·L^-1 H₂SO₄ was added, volume of the solution was made up to 5.0 mL, and the CN^--reagent Ⅰ was added, shaken well and stood for 2 min. The CN^--reagent Ⅱ was added and after shaking well and standing for 20 min, value of c.v. was measured by the water-quality determinator. Detection limit of the method was found to be 0.003 mg·L^-1, and RSDs (n=6) found were all less than 3.5%. Values of recovery found by standard addition method were in the range of 92.5%-103%. The proposed method was advantageous to be used for rapid analysis at field or testing site.