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JIANG Yulin CHEN Yanyu
ZHOU Haocheng MENG Lingyan
MEASUREMENT
Chemical oxygen demand (COD) measurement:
According to GB-11914
2Cr2O72- + 16H+ + 3C(organic matter) → 4Cr3+ +8H2O +3CO2
Chemical used for the measurement:
Ag2SO4 (Catalysts);
HgSO4 (Masking agent);
Fe(NH4)2·(SO4)2·6H2O (Standard Titration Solution);
H2SO4 (pH<2)
Equipment for the measurement:
Reflux device; heating equipment; Acid burette.
NEW METHOD
![图片4.png](https://static.wixstatic.com/media/6d1ac5_939a013039f94815b372004814f3769f~mv2.png/v1/fill/w_597,h_176,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/%E5%9B%BE%E7%89%874.png)
Spectrophotometry
![图片5.png](https://static.wixstatic.com/media/6d1ac5_f121f78dc5164971917037588f50f8fe~mv2.png/v1/fill/w_595,h_322,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/%E5%9B%BE%E7%89%875.png)
Fast digestion-spectrophotometric
![图片6.png](https://static.wixstatic.com/media/6d1ac5_758f777c485449019f2d6abf741765e9~mv2.png/v1/fill/w_596,h_280,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/%E5%9B%BE%E7%89%876.png)
Near-Infrared Spectrometry
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