学科交叉视域下高锰酸钾法测定水样中化学需氧量实验的设计与实践

刘晓红, 李姝, 叶世海, 楼兰兰

Design and Practice of the Experiment on the Determination of Chemical Oxygen Demand in Water Samples by Potassium Permanganate Method under the Interdisciplinary Perspective

Xiaohong Liu, Shu Li, Shihai Ye, Lanlan Lou

表3 草酸钠标准溶液浓度对实验室自来水中COD测定的影响

$ {{\stackrel{\mathrm{-}}{{c}}}_{\text{KMnO}}}_{\text{4}}\text{/} $(mol∙L−1) $ {\text{m}}_{\text{2, }{\text{Na}}_{\text{2}}{\text{C}}_{\text{2}}{\text{O}}_{\text{4}}} $/g $ {{c}}_{{\text{Na}}_{\text{2}}{\text{C}}_{\text{2}}{\text{O}}_{\text{4}}} $/(mol∙L−1) ② V1/mL $ {V}_{{\mathrm{N}\mathrm{a}}_{2}{\mathrm{C}}_{2}{\mathrm{O}}_{4}} $/mL V2/mL COD/(mg∙L−1) $ \stackrel{\mathrm{-}}{\text{COD}}\text{/} $(mg∙L−1) 相对平均偏差 0.02016 0.3546 0.01059 1.00 25.00 4.40 4.742 4.850 2.962 4.40 4.742 4.41 5.065 0.6294 0.01879 1.00 25.00 8.50 5.792 6.007 4.772 8.52 6.437 8.50 5.792 5.00 25.00 4.51 6.115 6.975 8.220 4.55 7.405 4.55 7.405 10.00 30.00 1.55 11.79 12.11 7.102 1.60 13.40 1.53 11.14 1.8082 0.05398 10.00 25.00 16.90 4.006 3.791 7.562 16.88 3.361 16.90 4.006