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Titration device and titration method for determining chloridion in cement

A titration device and the technology of chloride ions are applied in the direction of analyzing materials through chemical reactions and analyzing materials through observing the influence of chemical indicators. Accuracy and reliability, easy to observe effects

Inactive Publication Date: 2017-05-31
四川中核艾瑞特工程检测有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that there are many shortcomings in the determination of cement chloride ion by ammonium thiocyanate volumetric method in the prior art, and it is difficult to judge the titration end point, the present invention provides a cement chloride ion determination titration device and titration method. The device provided in this case And the method is easy to implement, and the test personnel can easily judge the titration end point, which can not only improve the accuracy of the test, but also avoid the visual fatigue of the test personnel

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  • Titration device and titration method for determining chloridion in cement
  • Titration device and titration method for determining chloridion in cement

Examples

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Embodiment 1

[0027] Such as figure 1 , A cement chloride ion determination titration device, comprising a stand, a burette installed on the stand, and a reagent bottle placed under the burette, and the reagent bottle is a porcelain crucible.

[0028] Specifically, the aqueous solution of ferric ammonium sulfate used as an indicator of the ammonium thiocyanate volumetric method to measure the chloride ion content in cement is reddish brown, and as the amount of silver thiocyanate generated increases, the color of the solution will continue to deepen, resulting in The red-brown change after adding the ammonium thiocyanate standard titration solution is not obvious, resulting in inaccurate determination of the titration end point and bringing errors to the test results. This solution is different from the prior art. The conical flask used as the reagent bottle in the prior art is replaced with a porcelain crucible. Under the white background of the porcelain crucible, ammonium thiocyanate back t...

Embodiment 2

[0032] This embodiment further optimizes the case on the basis of embodiment 1: As a further technical solution of the above-mentioned cement chloride ion determination titration method, the titration method includes the following steps in sequence:

[0033] S1, prepare cement solution;

[0034] S2, filter the cement solution to obtain the solution to be titrated;

[0035] S3. Put the solution to be titrated into a reagent bottle, and add a ferric ammonium sulfate indicator to the reagent bottle;

[0036] S4. Titrate the ammonium thiocyanate solution into the reagent bottle through a burette until a red-brown mutation occurs in the reagent bottle and the color does not disappear.

[0037] Further, in step S1, the cement solution is prepared by fully dispersing cement in water to obtain solution A, adding a nitric acid solution to solution A to obtain solution B, heating solution B to a boiling state and maintaining it for 1-2 minutes to obtain solution C ;

[0038] In step S2, the filtr...

Embodiment 3

[0042] The present invention provides a specific titration scheme: including the following steps:

[0043] 3-1. Prepare 100mL nitric acid solution A: 1 volume of commercially available concentrated nitric acid is mixed with 2 volumes of water, and stored in a brown volumetric flask for later use;

[0044] 3-2. Preparation of 250mL nitric acid solution B: 1 volume of commercially available concentrated nitric acid is mixed with 100 volumes of water, and stored in a brown volumetric flask for later use;

[0045] 3-3. Prepare silver nitrate standard solution: accurately weigh 8.4940g silver nitrate powder and dissolve it in water, transfer it into a 1000mL volumetric flask, add water to the marking line, and store in the dark for later use;

[0046] 3-4. Prepare ferric ammonium sulfate indicator solution: add 10 mL of nitric acid solution A to 100 mL of saturated ferric ammonium sulfate aqueous solution, shake well for use;

[0047] 3-5. Prepare ammonium thiocyanate standard solution: Weig...

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Abstract

The invention discloses a titration device and titration method for determining chloridion in cement. The device comprises a stand, a burette arranged on the stand, a reagent bottle arranged at the lower of the burette, wherein the reagent bottle is a porcelain crucible. An ammonium ferric sulfate indicator is adopted as the indicator in the titration method, the porcelain crucible is taken as the reagent bottle containing a cement solution and an ammonium thiocyanate solution is adopted as a titration solution. According to the titration device and the titration method, the accuracy and the reliability of determining the chloridion in the cement are improved; meanwhile, the requirements of the device and the method on the theoretical knowledge level and the operation experience of operating personnel are low in the titration process and asthenopia due to the fact that the operating personnel observe a color change of the titrated solution can be effectively avoided. Meanwhile, the method is simple in operation and low in detection cost, so that the method and the device are especially suitable for massive sample testing.

Description

Technical field [0001] The invention relates to the technical field of engineering building material cement detection, in particular to a titration device and a titration method for cement chloride ion determination. Background technique [0002] Chloride ions in cement are one of the main sources of chloride ions in concrete. Chloride ions can destroy the dense “passivation protective film” formed on the surface of steel bars under strong alkaline conditions, causing corrosion of steel bars and harming the durability of concrete structures. Therefore, the building materials industry pays particular attention to controlling the chloride ion content in cement. my country's cement standards stipulate that the chloride ion content in cement shall not exceed 0.06%. The current standards for the determination of chloride ion content mainly include ammonium thiocyanate volumetric method, potentiometric method, mercury thiocyanate colorimetric method, phosphoric acid distillation-mercu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 高奇李伟黄友芬张辉赤张建平沈媛媛陈海波廖青
Owner 四川中核艾瑞特工程检测有限公司
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