摘要
天然水体中存在的络合配位体与受纳的重金属污染物能产生一定的络合反应,通常可以用络合容量(ComplexCapacity)来表示天然水体的这一特性,它实际上反映水体中络合配位体(有机的或无机的)含量的多少,对研究水体自净能力和重金属在纳污水体中的迁移有实际意义。本文用铜标准溶液滴定待测水样,结合在线富集-FAAS测试技术,求得天然水体的络合容量和条件稳定常数,并对常量干扰因素的影响进行了检验。结果表明,水体pH5.0～9.0范围内,对络合容量测定无显著干扰。Cl-、SO2-4、HCO-3以及OH-可与Cu2+形成各种无机络合态铜,样品回收率为98.0%,测定络合容量的相对标准偏差为4.9%,条件稳定常数的相对标准偏差为8.4%。此外,还调查了郊区某水库络合容量的水平和垂向分布特征,并探讨了络合容量与水质指标化学需氧量、叶绿素a的相关关系,水样pH太低,有机络合态铜解离,宜造成结果偏低。
The complex ligand can product some complex reactions with the heavy metal pollutant of accepted in the natural water Usually, it can express the characteristic with the complex capacityIn fact, it expresses the content of the complex ligand (organic or inorganic), it can be used in understanding the selfpurification capacity of the natural water and the heavy metal migration in the polluted water In this paper, we titrated the water samples of needed determination with Cu standard solutions We obtained the complex capacities and condition stability constants of the natural water by FAAS coupled with online flow The influences of normal interferon were tested and discussed The result displayed that had not significance influences of determination Cu complex capacity with pH50～90 in the natural water The Cl-, SO2-4, HCO-3 and OH- could form inorganic ligands Cu The recovery rate is 980%The relative deviation of determination complex capacity is 49% The relative deviation of condition stability constants is 84% In addition, we surveyed the level and vertical distribution characteristic of the ligand in a reservoir near the city, and studied the correlation of COD, chlorophyll with the complex capacities If The pH was low, the organic Cu complex ligands could ionizate, and the result was low
出处
《中国环境监测》
CAS
CSCD
北大核心
2003年第3期11-14,共4页
Environmental Monitoring in China
基金
山东大学建委和山东大学环保局科研基金项目(199427)
