Method for testing water-soluble hexavalent chromium in cement or clinker

A testing method, hexavalent chromium technology, applied in the direction of measuring devices, analytical materials, material inspection products, etc., can solve the problems of cumbersome operation, complicated operation process, inconsistent operation process, etc., to improve accuracy, simplify operation steps and The effect of simple sample processing steps and operation steps

Pending Publication Date: 2019-08-13
ANHUI CONCH DESIGN & RES INST OF BUILDING MATERIALS CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

In this method, the amount of cement and standard sand is relatively large, and the cement sample, standard sand and water need to be stirred into cement mortar before testing. Larger, more difficult to filter
Moreover, in the process of working curve and sample test, the operation process of this method is not uniform (such as the concentration and addition amount of hydrochloric acid), the operation is relatively cumbersome, and quantitative control cannot be accurately carried out in the process of sample test, which will affect the test. repeatability and reproducibility

Method used

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  • Method for testing water-soluble hexavalent chromium in cement or clinker
  • Method for testing water-soluble hexavalent chromium in cement or clinker
  • Method for testing water-soluble hexavalent chromium in cement or clinker

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Embodiment 1

[0039] A method for testing water-soluble hexavalent chromium in cement or clinker, comprising the following steps:

[0040] (1) Pipette 5.0 mL of hexavalent chromium standard solution into a 100 mL volumetric flask, dilute with water to the marked line, and shake well to obtain a 5 mg / L standard hexavalent solution. Pipette 0mL, 1.0mL, 2.0mL, 5.0mL, 10.0mL and 15.0mL of 5mg / L standard hexavalent solutions into 50mL volumetric flasks respectively, dilute to 25mL with water, then add 5.0mL diphenylcarbazide solution in sequence and 2mL (1+1) hydrochloric acid solution, dilute to the marked line with water, shake well; measure with a spectrophotometer after standing for 15min, and perform a blank experiment to correct the test results. The results are shown in Table 1, and a standard curve is drawn.

[0041] Table 1

[0042]

[0043] (2) Weigh two parts of 50.0g hexavalent chromium cement standard and two parts of 50.0g cement samples into four 250mL beakers, add 100.0mL of ...

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Abstract

The invention provides a method for testing water-soluble hexavalent chromium in cement or clinker. Through performing washing and vacuum filtering on a cement and clinker sample containing water-soluble hexavalent chromium, removing quantitative filtrate and adding a diphenylcarbazide solution, adjusting acidity by using (1+1) hydrochloric acid, coloring, measuring the absorbance of a solution ata wavelength of 540 nm, and measuring the concentration of chromium (VI) in the solution through standard curve method, so that the content of hexavalent chromium in the sample is obtained. Comparedwith the prior art, the method for testing water-soluble hexavalent chromium in cement or clinker provided by the invention simplifies the test operation steps and sample processing steps; and the operating steps, and the concentration and amount of the substance are unified in the construction process of the standard curve and the sample, which is conducive to improve the accuracy, repeatabilityand reproducibility of the test.

Description

technical field [0001] The invention belongs to the technical field of cement detection, in particular to a method for testing water-soluble hexavalent chromium in cement or clinker. Background technique [0002] Water-soluble chromium refers to chromate or dichromate, in which chromium exists in the form of hexavalent state, which is called hexavalent chromium. The hazards of hexavalent chromium: Hexavalent chromium is highly toxic. Once the soil or groundwater is polluted by chromium, the soil cannot be farmed and the groundwater cannot be drunk. Hexavalent chromium can penetrate the cell membrane and has a strong oxidation effect, which can seriously damage the human digestive tract, Respiratory tract, skin and mucous membranes, and even carcinogenic; therefore, the detection of water-soluble hexavalent chromium is particularly important. [0003] At present, the test method for hexavalent chromium in cement mainly refers to the test method in the GB 31893-2015 national ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 李保军肖慧丽徐文祥沈江平徐雪玲王莹
Owner ANHUI CONCH DESIGN & RES INST OF BUILDING MATERIALS CO LTD
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