Method for determining bromate generated through approach of carbonate free radicals in ozone system
A carbonate and free radical technology, applied in the field of water treatment, can solve problems such as bromate exceeding the standard, and achieve the effect of easy operation and wide application range.
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Embodiment 1
[0032] The initial concentration of bromide ions in water is 10 μmol / L, the pH is 8, the water temperature is 20±2°C, and the total concentration of carbonate / bicarbonate is 0mmol / L, 0.5mmol / L, 1mmol / L, 2mmol / L and 4mmol respectively / L.
[0033] Divide the above water into two groups, one of which is ready for testing.
[0034] Add sulfuric acid to another group of water, adjust its pH to 1, mix well and blow off with nitrogen to remove carbonate / bicarbonate in the simulated water. Subsequently, sodium hydroxide is added to the water to adjust the pH back to the original value, and then tert-butanol is added to make tert-butanol and carbonate / bicarbonate in the water to be tested have the same ability to capture hydroxyl radicals, and the concentrations are respectively 0 μmol / L, 8.4μmol / L, 16.8μmol / L, 33.6μmol / L, 67.2μmol / L.
[0035] Add ozone to the two groups of water so that the concentration of ozone in the water is 4 mg / L, and react for 25 minutes.
[0036] The conce...
Embodiment 2
[0039] The initial concentration of bromide ions in water is 10 μmol / L, the pH is 7, the water temperature is 20±2°C, and the total concentration of carbonate / bicarbonate is 0mmol / L, 0.5mmol / L, 1mmol / L, 2mmol / L and 4mmol respectively / L.
[0040] Divide the above water into two groups, one of which is ready for testing.
[0041] Add sulfuric acid to another group of water, adjust its pH to 1, mix well and blow off with nitrogen to remove carbonate / bicarbonate in the simulated water. Subsequently, sodium hydroxide is added to the water to adjust the pH back to the original value, and then tert-butanol is added to make tert-butanol and carbonate / bicarbonate in the water to be tested have the same ability to capture hydroxyl radicals, and the concentrations are respectively 0 μmol / L, 6.05 μmol / L, 12.1 μmol / L, 24.2 μmol / L, 48.4 μmol / L.
[0042] Add ozone to the two groups of water so that the concentration of ozone in the water is 4 mg / L, and react for 25 minutes.
[0043] The ...
Embodiment 3
[0046] The initial concentration of bromide ions in water is 10 μmol / L, the pH is 6, the water temperature is 20±2°C, and the total concentration of carbonate / bicarbonate is 0mmol / L, 0.5mmol / L, 1mmol / L, 2mmol / L and 4mmol respectively / L.
[0047] Divide the above water into two groups, one of which is ready for testing.
[0048] Add sulfuric acid to another group of water, adjust its pH to 1, mix well and blow off with nitrogen to remove carbonate / bicarbonate in the simulated water. Subsequently, sodium hydroxide is added to the water to adjust the pH back to the original value, and then tert-butanol is added to make tert-butanol and carbonate / bicarbonate in the water to be tested have the same ability to capture hydroxyl radicals, and the concentrations are respectively 0 μmol / L, 2.72μmol / L, 5.43μmol / L, 10.87μmol / L, 21.74μmol / L.
[0049] Add ozone to the two groups of water so that the concentration of ozone in the water is 4 mg / L, and react for 25 minutes.
[0050] The co...
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