Method for determining COD of pot bottom water through rapid unsealed catalytic digestion
A bottom pot water, non-sealed technology, applied in the measurement of color/spectral characteristics, etc., can solve the problem of inappropriate bottom pot water, and achieve the effect of overcoming the limitation of measurement range, overcoming danger, and improving work efficiency
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[0037] 1. Reagents and materials
[0038] Unless otherwise specified, the reagents used in this method should be analytically pure chemical reagents that meet national standards, and the experimental water should be freshly prepared deionized water or distilled water.
[0039] 1) Water: It should meet the relevant requirements of GB / T6682 first-class water.
[0040] 2) (1+9) sulfuric acid solution: Slowly add 100ml of concentrated sulfuric acid with a concentration of 1.84g / mL into 900ml of water along the beaker wall, stir and mix well to obtain (1+9) sulfuric acid solution, cool it for later use.
[0041] 3) ρ(HgSO 4 )=0.20g / ml mercury sulfate solution:
[0042] Weigh 20g of mercuric sulfate and dissolve it in (1+9) sulfuric acid solution, set the volume to 100ml, shake well, and dissolve it fully (if it is insoluble, heat it slightly on an electric stove to dissolve it), and set aside the mercuric sulfate solution.
[0043] 4)c(1 / 6K 2 Cr 2 o 7 )=0.512mol / L potassium d...
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