（广东省环境监测中心，广东 广州 510310）
Comparison and Analysis of Different Pretreatment Methods on Total Cyanide in Water
（Guangdong Enviromental Monitoring Center, Guangdong 510310,China）
Abstract: This article compared and analyzed different pretreatment methods on total cyanide in water through results of the detection limit, accuracy, the recovery of standard addition and precision. The result showed that the detection limit of the pretreatment of conventional distillation and STEHDB-106-3RW distillation was 0.004mg/L. The recovery of standard addition of two pretreatment methods was 92%, 96%, 96%. And the precision was 6.2%, 3.3%. Compared with the conventional distillation, the accuracy and precision of automatic distillations was higher. It took less time and less human resources by using automatic distillations. It is suitable for measurement of large quantities of total cyanide in water.
Key words: total cyanide; pretreatment; automatic distillation; comparison and analysis