配位体交换-流动注射分析法测定水中有效氰化物  

Determination of available cyanide in water by ligand exchange-flow injection analysis

作　　者：乔小宇[1,2] 李华昌[2] 于力[2] 张萍 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004 [2]北京矿冶研究总院测试研究所,北京102600 [3]北京普立泰科仪器有限公司,北京102208

出　　处：《冶金分析》2012年第10期50-55,共6页Metallurgical Analysis

摘　　要：研究了采用配位体交换试剂和CNSolutionFS 3100氰化物分析系统检测水中有效氰化物(即CN-、HCN(aq)以及锌、铜、镉、汞、镍和银的氰络合物的总和)的分析方法。在反应模块中生成的气态HCN通过气体扩散膜片(GD)进入碱性吸收液中并转换为CN-,然后进入流动检测池由安培计检测。考察了甲醛类化合物、苯酚化合物、次氯酸钠及硫化物等对CN-测定的干扰及消除方法。实验结果表明,CN-浓度在2.0～1 000μg/L范围内,线性相关系数r>0.999 6;检出限为0.6μg/L;RSD(n=5)<2.5%;实际样品加标回收率为92%～102%。该方法可应用于大批量地表水、地下水、饮用水及石油化工、冶金、电镀、造纸等行业废水中有效氰化物的测定。A method {or the determination of the available cyanide,namely, the total of cyanide including ions （CN）, HCN （aq）,as well as zinc,copper,cadmium,mercury,nickel and silver cyanide complexes in water by ligand exchange reagents and CNSolution FS 3100 cyanide analyzer, has been studied. Gaseous HCN which was generated in the reaction module entered into alkaline absorption solution by gas diffusion diaphragm （GD） and was converted to cyanide ions （CN-）,and then was detected by ammeter in the flow testing pool. The interference of methanal, phenol, sodium hypochlorite, and sulfide to the determination of CN- was inspected and removed. The experiment results indicated that, in the range of cyanide concentration between 2.0-1 000 μg/L,r〉0. 999 6 ;the detection limit of method was 0. 6 μg/L;the relative standard deviation （RSD） （n=5） was smaller than 2.5% ,the recoveries of real samples were 92%-102%. It can be applied to detect the available cyanide in large amount of surface water,groundwater, drinking water and wastewater of petroleum chemical industry, metallurgy, electroplating, papermaking.

关 键 词：配位体交换 流动注射 有效氰化物 氰化物 

分 类 号：X832[环境科学与工程—环境工程]