Method for determining sulfate radical of high concentration in complex solution
A determination method and technology of sulfate radicals, which are applied in chemical analysis by titration, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. problems, to achieve the effect of simple operation, interference elimination, and expansion of application scope
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Embodiment 1
[0019] Use a pipette to accurately pipette 10.00 mL of the solution to be tested into a 50 mL volumetric flask, add 10.0 mL of hydrochloric acid with a concentration of 6 mol / L, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 10.00mL of the solution from the mixed 50mL volumetric flask into a 100mL volumetric flask, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 20.00mL of the solution from the mixed 100mL volumetric flask into a 250mL beaker, add 2.0mL of hydrochloric acid with a concentration of 6mol / L to the beaker, rinse the cup wall with deionized water, and dilute to 80mL. Add 2.0 mL of ammonium citrate solution with a concentration of 4% by mass, and 5.0 mL of triethanolamine solution with a concentration of 20% (V / V), and stir for 2 min as the solution to be titrated.
[0020] Add 10.0mL of benzidine hydrochloride solution with a mass percentage concentration of 2.5% to the solution to b...
Embodiment 2
[0022] Use a pipette to accurately pipette 20.00 mL of the solution to be tested into a 50 mL volumetric flask, add 20.0 mL of hydrochloric acid with a concentration of 6 mol / L, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 10.00mL of the solution from the mixed 50mL volumetric flask into a 100mL volumetric flask, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 10.00mL of the solution from the mixed 100mL volumetric flask into a 250mL beaker, add 2.0mL of hydrochloric acid with a concentration of 6mol / L to the beaker, rinse the cup wall with deionized water, and dilute to 80mL. Add 5.0 mL of ammonium citrate solution with a mass percent concentration of 4%, and 5.0 mL of a triethanolamine solution with a concentration of 20% (V / V), and stir for 2 min as the solution to be titrated.
[0023] Add 10.0mL of benzidine hydrochloride solution with a mass percentage concentration of 2.5% to the soluti...
Embodiment 3
[0025] Use a pipette to accurately pipette 25.00 mL of the solution to be tested into a 50 mL volumetric flask, add 20.0 mL of hydrochloric acid with a concentration of 6 mol / L, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 10.00mL of the solution from the mixed 50mL volumetric flask into a 100mL volumetric flask, dilute to volume with deionized water, and mix well. Use a pipette to accurately pipette 10.00mL of the solution from the mixed 100mL volumetric flask into a 250mL beaker, add 2.0mL of hydrochloric acid with a concentration of 6mol / L to the beaker, rinse the cup wall with deionized water, and dilute to 80mL. Add 5.0 mL of ammonium citrate solution with a mass percent concentration of 4%, and 8.0 mL of a triethanolamine solution with a concentration of 20% (V / V), and stir for 2 min as the solution to be titrated.
[0026] Add 10.0mL of benzidine hydrochloride solution with a mass percentage concentration of 2.5% to the soluti...
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