Method for measuring polyvinyl alcohol content in water

A polyvinyl alcohol and determination method technology, applied in the field of analysis and determination of chemical substances, can solve problems such as inaccurate measurement results, large errors, poor reproducibility of measurement results, etc.

Active Publication Date: 2008-11-12
四川省环保科技工程有限责任公司
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  • Abstract
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Problems solved by technology

The inventor adopts this assay method to carry out verification through a series of basic experiments (experimental process, see Annex 1) and finds that there is a large error in this assay method, and the measurement result reproducibility is relatively poor
The inventor thinks that in the actual use of PVA size, it contains certain starch, CMC size, polyacrylic acid size, etc., which are more likely to interfere with the PVA measurement, and wherein starch is an unavoidable interference in the actual PVA measurement. , the above measurement method fails to eliminate the relevant interference, thus bringing inevitable measurement errors, resulting in inaccurate measurement results

Method used

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Embodiment Construction

[0014] The invention proposes a method for measuring polyvinyl alcohol (PVA) by boric acid-iodine spectrophotometry.

[0015] The working curve of this method is made according to the degree of polymerization and alcoholysis of polyvinyl alcohol (PVA), including 1788, 1799, 2088, 2099, 124 (equivalent to domestic 2499 or 2599), etc.

[0016] The invention is applicable to the determination of surface water, domestic sewage and industrial waste water. The polyvinyl alcohol measured by this method is a mixture of polyvinyl alcohol and polyvinyl acetate.

[0017] The minimum linear detection concentration of the present invention is 6mg / L, and the detection upper limit is 20mg / L.

[0018] Working temperature ≥ 20°C when measuring.

[0019] Polyvinyl alcohol: including polyvinyl alcohol with different degrees of polymerization and different degrees of alcoholysis dissolved in water and polyvinyl acetate alcohol as the raw material for preparing such products.

[0020] Starch in...

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PUM

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Abstract

The invention discloses a method for measuring polyvinyl alcohol content in the water. An excessive sulfuric acid is added under neutral heating condition (60-90 DEG C.) to remove starch having interference to the measurement by hydrolysis, and the excessive acid reacts with the polyvinyl alcohol in the sample to generate an ester in the mean time. In presence of boracic acid, the polyvinyl alcohol and the ester generated by reaction of the polyvinyl alcohol and the sulfuric acid can both react with a boracic acid - iodine - potassium iodide solution to produce a stable blue-green complex compound, and an absorbency is measured by a spectrophotometer at a point of a special wavelength of 645nm. A standard work curve is drawn according to the linear relation between the absorbency and the concentration of the reactor, thus the concentration of the sample can be known by checking the drawn standard curve after the sample measurement. The invention controls measurement error within the range of 5%, and the measurement result is stable and accurate, which makes the invention a feasible method for measuring polyvinyl alcohol concentration in the printing waste water.

Description

technical field [0001] The invention relates to a method for analyzing and measuring chemical substances, in particular to a method for determining the content of polyvinyl alcohol in water by using a spectrophotometer. Background technique [0002] Textile printing and dyeing wastewater contains dyes, sizing agents, additives, oil agents, acids and bases, fiber impurities, sand substances, inorganic salts, etc., and has the characteristics of large water volume, strong impact load, high content of organic pollutants, partial alkalinity, and water quality changes. Large and other characteristics, is one of the difficult industrial wastewater. For a long time, printing and dyeing wastewater has been recognized as one of the serious water pollution. At present, in order to meet the requirements of the market, there are endless varieties of textile printing and dyeing products, and the addition of many dyes, auxiliaries, and surfactants with complex structures has resulted in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/25
Inventor 廖激田庆华简磊王维竺美
Owner 四川省环保科技工程有限责任公司
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