Method for fast slaking chemical oxygen demand in water quality testing in photometric analysis
A technology for chemical and photometric analysis of water quality, applied in the measurement of color/spectral properties, measuring devices, analytical materials, etc. It can solve the problems of inability to use online monitoring, high operating costs, and long digestion time, so as to reduce analysis costs and ensure accuracy. temperature, and the effect of increasing the digestion temperature
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Embodiment 1
[0012] According to H 2 SO 4 with H 3 PO 4 The volume ratio of 3:1 to 5:1 takes concentrated H 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:1 ~ 1:3, the preparation of catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.25 ~ 0.40 grams, the oxidant K 2 Cr 2 o 7 The concentration of the solution is 0.10-0.25mol / L to prepare the digestion solution; according to the volume ratio of sewage to digestion solution 1:2-1:3, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C. The time is 10 to 20 minutes, using a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 590-610nm light is used to measure the chemical oxygen demand of water quality.
Embodiment 2
[0014] According to H 2 SO 4 with H 3 PO 4 Take concentrated H at a volume ratio of 5:1 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:1, the preparation catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.25 grams, the oxidizing agent K 2 Cr 2 o 7 The concentration of the solution is 0.10mol / L, and the digestion solution is prepared; according to the volume ratio of sewage and digestion solution 1:2, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C, and the digestion time is 10-20min. Use a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 590nm light is used to measure the chemical oxygen demand of water quality.
Embodiment 3
[0016] According to H 2 SO 4 with H 3 PO 4 The volume ratio is 3:1 to take concentrated H 2 SO 4 and concentrated H 3 PO 4 , to prepare mixed acid H 2 SO 4 -H 3 PO 4 , according to MnSO 4 with CuSO 4 The weight ratio of 1:3, the preparation catalyst MnSO 4 -CuSO 4 , add catalyst MnSO in 100ml mixed acid 4 -CuSO 4 and oxidant K 2 Cr 2 o 7 , the catalyst MnSO 4 -CuSO 4 The addition amount is 0.40 g, the oxidizing agent K 2 Cr 2 o 7 The concentration of the solution is 0.25mol / L, and the digestion solution is prepared; according to the volume ratio of sewage and digestion solution 1:3, the digestion solution is added to the sewage for digestion. The digestion temperature is 150-170°C, and the digestion time is 10-20min. Use a photometer or water quality chemical oxygen demand (COD Cr ) online monitor through Cr 3+ The absorbance of 610nm light is used to measure the chemical oxygen demand of water quality.
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