摘要
目的建立用流动注射在线氰蒸馏测定水和废水中总氰化物的方法。方法用QC8000型流动注射分析仪在线氰蒸馏，液体样品首先与磷酸混合，加热至140℃，然后紫外光裂解金属-CN^-的有机复合物。气态的HCN从样品基体中释放，穿过Teflon膜，然后用氢氧化钠溶液吸收。CN^-在570nm处比色测定（吡啶-巴比妥酸反应），标准和样品均在线蒸馏。结果测定总氰化物线性范围为2～100μg/L，检出限为0．021μg/L，加标回收率为94．4％～105％，r〉0．999。结论该方法操作简便，灵敏度高，较标准方法更灵敏。
Objective To Establish a method of using flow injection in - line cyanide distillation to determine total cyanide in water and wastewater.Methods A QC8000 analyzer inline cyanide distillation was used.Firstly,a liquid sample was mixed with phosphoric acid and heated to 140℃, then metal - CN^- complexes was irradiated by UV to break down. The HCN（g） from the sample matrix passed through a Teflon membrane and was trapped into a sodium hydroxide solution. The CN^- was determined colorimetrically （ pyridine - barbituric acid chemistry） at 570 nm. Both standards and samples were distilled in - line. Results The linear range of the method was 2 - 100μg/L, detected limit was 0.21μg/L, The recovery rates were 94.4% - 105%. Correlation coefficient was above 0.999. Conclusion The method is simple and sensitive compared with method of standard.
出处
《中国卫生工程学》
CAS
2006年第4期229-230,共2页
Chinese Journal of Public Health Engineering
关键词
流动注射
废水
总氰化物
在线分析
Flow injection
Wastewater
Total cyanide
In-line analysis
