Method for measuring polyepoxysuccinic acid content of circulating cooling water by pinacyanol chloride spectrophotometric method

A technology of polyepoxysuccinic acid and chlorinated pinacol, which is applied to the measurement of color/spectral properties, preparation of samples for testing, etc. , protect the environment, and promote the effect of application

Inactive Publication Date: 2011-11-23
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for determining the content of polyepoxysuccinic acid in circulating cooling water by spectrophotometric method for measuring the content of polyepoxysuccinic acid in circulating cooling water system, to solve the problem that there is no method to measure the content of polyepoxysuccinic acid in circulating cooling water system The problem of polyepoxysuccinic acid content

Method used

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  • Method for measuring polyepoxysuccinic acid content of circulating cooling water by pinacyanol chloride spectrophotometric method
  • Method for measuring polyepoxysuccinic acid content of circulating cooling water by pinacyanol chloride spectrophotometric method
  • Method for measuring polyepoxysuccinic acid content of circulating cooling water by pinacyanol chloride spectrophotometric method

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1: the standard curve of polyepoxysuccinic acid concentration and absorbance relation

[0038] The establishment of the standard curve is carried out as follows:

[0039] (1) Solution preparation:

[0040] Preparation of standard solution of pinacyanohydrin chloride: Weigh 0.1665g of pinacyanin chloride, add 250ml of methanol and 750ml of ethylene glycol into the mixed solution, shake fully, and place in a brown bottle to obtain 4.25×10 -4 The standard solution of pinacyanin chloride in mol / L is stored at 4°C.

[0041] Preparation of polyepoxysuccinic acid standard solution: Weigh 100 mg polyepoxysuccinic acid, dilute to 1000 ml with water, and shake fully to obtain 100 mg / L polyepoxysuccinic acid standard solution.

[0042] Preparation of borax-sodium bicarbonate buffer solution with pH 9.40: Measure 50ml of 0.05mol / L borax solution and 11ml of 0.2mol / L sodium hydroxide solution, add water to dilute to 200ml, shake well, and mix well.

[0043] (2) Standa...

Embodiment 2

[0046] Embodiment 2: the typical curve of polyepoxysuccinic acid concentration and absorbance relation

[0047] Step is with embodiment 1.

[0048] The polyepoxysuccinic acid standard solution volume and test result of measuring 100mg / L are shown in Table 2, figure 2 A standard curve of absorbance versus polyepoxysuccinic acid concentration is shown. The results show that: when the concentration of polyepoxysuccinic acid is between 0 and 2.0 mg / L, the linear regression equation has better linearity, and its R 2 =0.993. When the concentration of polyepoxysuccinic acid is between 0 and 1.5 mg / L, the linear regression equation has better linearity, and its R 2 =0.997.

[0049]

[0050] Table 2: 0~2.0 mg / L polyepoxysuccinic acid (PESA) standard curve

[0051]

Embodiment 3

[0052] Embodiment 3: the mensuration of the polyepoxysuccinic acid concentration in the industrial circulating cooling water system

[0053] This embodiment is applicable to a system with polyepoxysuccinic acid standard samples.

[0054] The water samples tested in this example are taken from the circulating cooling water system of a steel plant, which uses polyepoxysuccinic acid, a phosphorus-free scale inhibitor and dispersant. Take circulating cooling water sample V ml, put it in a 100ml volumetric flask, add 2ml of buffer solution, add water to dilute to the mark, shake well, add 4.25×10 -4 2 ml of mol / L standard solution of pinacyanin chloride, develop color for five minutes, and measure absorbance at 600 nm. Each absorbance was measured three times and the average value was taken. By bringing the measured values ​​into the regression equation, the concentration C of polyepoxysuccinic acid in the diluted sample can be estimated.

[0055] The formula for calculating t...

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Abstract

The invention belongs to the technical field of industrial water treatment and in particular relates to a method for measuring the polyepoxysuccinic acid content of circulating cooling water by a pinacyanol chloride spectrophotometric method. The method particularly comprises the following steps of: preparing a group of polyepoxysuccinic acid solution at the concentration of 0 to 1.5 mg/L; adding borax-sodium hydroxide buffer solution with the pH value of 9.40 and pinacyanol chloride standard solution into the polyepoxysuccinic acid solution; developing for 5 minutes; measuring the absorbance at the position of 600 nm by using a spectrophotometer; deducting blank absorbance from the absorbance of the solution to form linear relationship between the absorbance of the solution and the polyepoxysuccinic acid concentration, wherein distilled water serves as blank; and obtaining the polyepoxysuccinic acid concentration in a circulating cooling water system through a standard curve. The method has the advantages of simpleness, convenience, easiness in operation, capacity of measuring the dirt dispersion agent polyepoxysuccinic acid content of the circulating cooling water quickly and accurately and the like. By the test method, the basis can be provided for quantitatively adding the polyepoxysuccinic acid scale and corrosion inhibitor of the industrial circulating cooling water; medicament cost can be effectively reduced; the using efficiency of the medicaments can be improved; and the circulating cooling water system can operate normally.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to a method for measuring the content of polyepoxysuccinic acid in circulating cooling water by spectrophotometry with pinacyanochloride. Background technique [0002] During the operation of industrial circulating cooling water, the cooling water is continuously evaporated and lost, resulting in various scaling-prone Ca ions in the water body. 2+ , Mg 2+ 、Ba 2+ As the circulating cooling water keeps rising, it is easy to generate scale and endanger the safety of the system. In order to maintain the content of various minerals and ions at a certain value, it is necessary to add a certain amount of cooling water to the system and discharge a certain amount of cooling water ( sewage discharge). But at the same time, the addition of supplementary water and the discharge of sewage cause the concentration of scale and corrosion inhibitors in the water bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 张冰如李风亭胡伟孙培蒂刘杨
Owner TONGJI UNIV
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