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
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[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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