废水中生化需氧量测定的干扰消除.pdfVIP

安徽农业科学，Joumal of Anhui Agri. Sci.20日，41 (17) :765[ -7652 ,7701 责任编辑杨莹莹责任校对卢瑶 废水中生化需氧量测定的干扰消除 郑璇，李莉，赵冰，肖溶 (重庆市环境监测中心，重庆 40[ 叩) 摘要 [目的]消除废水中铁离子对生化需氧量测定的干扰。[方法]针对铁离子的化学特征，向含铁废水中分别加入滔石酸钧、氟化仿 和 EDTA 3 种掩蔽剂，对比分析不同掩蔽剂对铁离子的掩蔽效果。[结果]当废水中铁离子浓度超过3. ∞ mglL 时，将干扰琪量法测定 生化需氧量。 3 种掩蔽剂中，氟化匆的掩藏效果最好，2. ∞时40% 条化何可掩蔽的铁离子浓度不超过 1 5ωmglLo [结论]废水中加入 2 ∞ m140% 氟化匆溶液，来消除铁离子对废水中生化需氧量测定的干扰是可行的。 关键词 生化需氧量;铁离子;干扰;掩就剂 中图分类号 S 181. 3 文献标识码 A 文章编号 0517 -6611(2013)17 -07651 -02 Inteñerence Elimination in Biochemical Oxygen Demand Detennination of Waste Water ZHENG Xuan et al (Chongqing Environmental Monitoring Center , Chongqing 401147) Abstract [ Objective 1The study aimed to eliminate the interference of iron ion to biochemical oxygen demand determination of waste water. [ Method] According to the chemical characteristics of iron ion , three shelter agents (sodium tartrate , potassium fluoride and EDTA) 附，re added to waste water to comp缸e their shelter effects on iron ion. [Result] Determination of biochemical oxygen demand (BOD) using iodometric meth- od will be affected when iron ion concentration in w困te water is more than 3. ∞ mglL. Among the three shelter agents , potassium f1uoride h出 the best shelter effect on iron ion , and less than 1 5∞ mglL iron ion can be sheltered by 2. ∞ ml of 40% potassium f1uoride. [Conclusion 11t is feasible to add 2. ∞ ml of 40% potassium f1 uoride to waste water to eliminate the interference of iron ion to biochemical oxygen demand deter- mination of waste water. Key words Biochemical oxygen demand; 1ron ion; 1nterference; Shelter agent TA 、氟化饵 3 种掩蔽剂对铁离子的掩蔽效果，探讨一种适用 生活废水与工业废水中含有大量各类有机物，这些有机 物在水体中分解时要消挺大量榕解氧，从而破坏水体中氧的 于腆量法测定含铁废水潜解氧，从而测定其五日生化需氧量 平衡，使水质恶化。水体中所含的有机物成分复杂，难以逐