摘要
根据重铬酸钾消解废水后其最终还原产物Cr3+ 浓度与COD值成正比关系 ,以及在碱性条件下 ,Luminol H2 O2 Cr3+ 体系产生很强的化学发光的原理 ,提出了一种用光电二极管做检测器测定水体的化学需氧量的新方法。本方法线性范围为 2 .1～ 60 0mg L,r2 =0 .9974;检出限为 2 .1mg L ;回收率为 1 0 0 %± 1 0 % ;RSD≤ 5 % (n =6)。用于实际样品测定 ,结果满意。
According to the fact that chromium(III) can catalyze the luminol oxidation reaction with hydrogen peroxide in basic medium using potassium bromide as an enhancer, a novel method for determining chemical oxygen demand in environmental cater samples by chemiluminescence method with a photodiode detector was studied. The linear range was 2.1similar to600 mg/L, r(2)=0.9974; recovery range was between 90% and 110% and RSD was lower than 5% (n=6). It has been applied to determine real samples with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2003年第12期1430-1432,共3页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金资助项目 (No .2 0 0 5 0 0 5 )
