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Method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate

A technology for tetrakis hydroxymethyl phosphorus sulfate and formaldehyde content, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of complex operation, complicated reagents, etc. , to achieve the effect of simple preparation, low detection cost and less reagents

Inactive Publication Date: 2012-06-20
HUBEI XINGFA CHEM GRP CO LTD
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Problems solved by technology

[0003] There are many detection methods for formaldehyde content, and the determination of formaldehyde content for tetrakis hydroxymethyl phosphorus sulfate is more complicated, more reagents are used, and the operation is complicated

Method used

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  • Method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate
  • Method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate
  • Method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate

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Embodiment Construction

[0014] The principle of the present invention is that formaldehyde can react with sodium sulfite to generate "sodium formaldehyde sulfite" and sodium hydroxide. Titrate the released sodium hydroxide with an acid of known concentration to obtain the content of formaldehyde. The reaction formula is as follows:

[0015]

[0016] Reagents and water used in the present invention refer to analytically pure reagents and third-grade water specified in GB / T 6682. If no other requirements are specified, the standard titration solutions, impurity standard solutions, preparations and products used in the test shall be prepared and calibrated according to the provisions of GB / T 601, GB / T 602 and GB / T 603.

[0017] (1) Sodium hydroxide solution: c(NaOH)=0.5mol / L

[0018] (2) Hydrochloric acid standard titration solution: c(HCl)=0.5mol / L

[0019] (3) Thymolphthalein indicator solution: 1g / L

[0020] (4) Sodium sulfite solution: c(Na 2 SO 3 )=1.0mol / L

[0021] Sodium sulfite prepar...

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Abstract

The invention discloses a method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate, which comprises the steps of: weighing 2-5 g of sample and putting the sample in a 250 mL conical flask, adding 50 mL of distilled water therein, dripping 5 drops of thymolphthalein indicator, adjusting the test solution to microscopic blue by sodium hydroxide solution or hydrochloric acid solution; adding 50 mL of sodium sulfite solution and immediately titrating the solution to an end point by a standard hydrochloric acid titration solution; and performing a blank test in the same method. Compared with the method of measuring formaldehyde content by an instrument, the method of the invention has the advantages of utilizing acid-base titration and optimizing the conditions, thereby having few utilized reagents, simple preparation, long service life of reagents, simple and convenient operation and low detection cost.

Description

technical field [0001] The invention relates to a method for determining the content of formaldehyde, in particular to a method for determining the content of formaldehyde in tetrakis hydroxymethyl phosphorus sulfate. Background technique [0002] Tetrahydroxymethylphosphorus sulfate (THPS) is mainly used as a bactericide and algicide in water treatment, oil field pipelines, fish farming, etc. After use, it can be rapidly degraded into completely harmless substances, and is also commonly used in fabric flame retardant treatment, leather softening and Paper and other industries. Formaldehyde is a colorless gas with a strong pungent smell, which is harmful to human health. Since formaldehyde is used as a raw material in the synthesis of THPS, a certain amount of formaldehyde is contained in THPS finished products and downstream products of THPS. Considering the requirements of saving finished products, protecting the environment and ensuring product quality, it is very neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 李国璋彭仁文龚礼胜张永萍
Owner HUBEI XINGFA CHEM GRP CO LTD
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