毛竹叶中氰化物的提取及其含量测定

建立了以水蒸气蒸馏法提取、采用离子选择性电极法测定毛竹竹叶中氰酸根离子的方法.以H₃BO₃溶液为离子强度剂,在18～25 ℃条件下中速搅拌,pH值12.0碱性介质中,测量范围为0.1～10.0 μg·g^-1,RSD (n=6)为1.1%～4.2%,回收率在96.0%～102.0%之间.方法具有操作简便、快速、灵敏度高等优点,测定结果满意.

Extraction and Determination of Cyanide from Leaves of Phyllostachys Pubescens

Extraction of cyanide from leaves of phyllostachys pubescens by steam distillation method has been performed.Cyanate ion was well determinated by ion-selective electrode using H₃BO₃ as ionic strength agent at the temperature from 18 ℃ to 25 ℃ with medium stirring speed in the pH was 12 alkaline medium.Under the optimum conditions，the measured scope ranged from 0.1 μg·g^-1 to 10.0 μg·g^-1 with the relative standard deviation of 1.1%～4.2% (n=6).The recoveries of CN- ranged from 96.0% to 102.0%.The method has the advantages of simple operation，high sensitivity and high sample throughput.The method has been applied to the determination of cyanate ion and the results are satisfactory.