快速测定COD最佳催化消解体系研究

Study on the optimal catalytic system for rapid determination of COD

通过正交试验 ,确定了测定环境水样中COD的最佳回流消解条件。以CuSO4作催化剂 ,KAl(SO4) 2 Na2 MoO4作助催化剂 ( 0 1 8gCuSO4·5H2 O 0 1 0gKAl(SO4) 2 ·1 2H2 O 0 1 0gNa2 MoO4·2H2 O) ,在H2 SO4 H3PO4体系中可很好地实现对样品的消解。该体系将回流时间由国标法的 2h缩短至 2 0min ,实现了快速测定的目的且大幅度降低测定成本。样品 1 0次平行测定的相对标准偏差为 1 1 % ;加标回收率为 97 7%～ 1 0 3 3% 。

An optimal catalytic digestion system for rapid determination of chemical oxygen demand(COD) was studied by orthogonal experiments. With the combined catalysts of CuSO 4, KAl(SO 4) 2 and Na 2MoO 4 in H 2SO 4 H 3PO 4 solution, the period of heating circumfluence was greatly curtailed and the cost of the determination was decreased. The relative standard deviation and recovery of such system are 1.1% and 97.7%～103.3%, respecitively.