Potentiometric titration determining method of boric acid in water-based adhesive

Potentiometric titration determining method of boric acid in water-based adhesive

  • CN 105,067,756 A
  • Filed: 08/03/2015
  • Published: 11/18/2015
  • Est. Priority Date: 08/03/2015
  • Status: Active Application
First Claim
Patent Images

1. a potentiometric titration assay method for water base adhesive mesoboric acid, it comprises the following steps:

  • (1) taking water base adhesive sample adds in beaker, adds water, and limit is stirred, and limit dropwise adds hydrochloric acid solution, until the pH value of mensuration solution is in 2.0 ~ 5.6 scopes;

    (2), by the sample after above-mentioned process, under constantly stirring, add Standard Volumetric Solutions for Sodium Hydroxide and regulate solution ph to reach 7.2 ~ 8.1;

    (3) add mannitol saturated solution, and continue to stir, the pH value of solution declines immediately, after about 1min, zeroing buret, uses Standard Volumetric Solutions for Sodium Hydroxide titration, when pH value returns back to 7.2 ~ 8.1, the required Standard Volumetric Solutions for Sodium Hydroxide volume of record;

    (4) do not add sample, measure the Standard Volumetric Solutions for Sodium Hydroxide volume needed for blank solution according to step (1) ~ (4);

    (5) by formula X=1000&

    times;

    61.83&

    times;

    C&

    times;

    (V-V0)
    m0
    Calculate the content of boric acid;

    In formula;

    The content of X-sample mesoboric acid, unit is milligrams per kilogram (mg/kg);

    C-Standard Volumetric Solutions for Sodium Hydroxide concentration, unit is mole often liter (mol/L);

    The volume of the Standard Volumetric Solutions for Sodium Hydroxide that V-sample consumes, unit is milliliter (mL);

    V 0the volume of the Standard Volumetric Solutions for Sodium Hydroxide that-blank sample consumes, unit is milliliter (mL);

    M 0-sample mass, unit is gram (g).

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