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Method for rapidly determining content of free fluorine and monofluorophosphate radical in sodium monofluorophosphate

A technology of sodium monofluorophosphate and monofluorophosphoric acid, which is applied in measuring devices, material separation, instruments, etc., can solve the problems of cumbersome process, complicated detection method, and difficulty in finding the cause, so as to improve work efficiency, shorten detection time, and accurately The effect of high accuracy and precision

Active Publication Date: 2017-01-04
湖北省兴发磷化工研究院有限公司
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Problems solved by technology

[0002] Sodium monofluorophosphate is a new type of chemical product. The detection method for free fluorine and monofluorophosphate in the national standard (GB 24567-2009 sodium monofluorophosphate for toothpaste industry) is extremely complicated and takes about 26 hours. It is cumbersome, and it is not easy to find the cause of the problem

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  • Method for rapidly determining content of free fluorine and monofluorophosphate radical in sodium monofluorophosphate
  • Method for rapidly determining content of free fluorine and monofluorophosphate radical in sodium monofluorophosphate

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Embodiment 1

[0026] Use instrument model: ICS-2000 ion chromatograph (Dionex company), Millipore A10 ultrapure water meter;

[0027] A method for quickly determining free fluorine and monofluorophosphate in sodium monofluorophosphate, which includes the following steps:

[0028] 1) Turn on the machine, use KOH eluent, set the flow rate to 1.00mL / min, and establish the method;

[0029] 2) Prepare a series of fluoride ion standard solutions with a fluoride ion concentration of 0.1, 0.5, 1, 5, 10ug / ml; prepare a series of monofluorophosphate standard solutions with a monofluorophosphate concentration of 50, 100, 150, 200, 300, 400, 500 ug / ml;

[0030] 3) Inject the standard solution into the ion chromatograph sequentially, and perform gradient elution. The concentration of the eluent is 25, 50, 99, 50 mmol / L, and the test time for one sample is 20 minutes;

[0031] 4) Weigh a certain amount of sodium monofluorophosphate sample, dilute it with pure water about 3000 times, inject the sample, and perform ...

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Abstract

The invention belongs to the field of chemical detection and analysis and particularly relates to a method for rapidly determining the content of free fluorine and monofluorophosphate radical in sodium monofluorophosphate. An ion chromatography leacheate is used as a strong alkaline KOH solution which is different from weak alkaline leacheates such as Na2CO3, NaHCO3 and the like in the past. A sodium monofluorophosphate sample is diluted with pure water for certain multiples, the solution is injected into an ion chromatograph for gradient elution, and free fluorine and monofluorophosphate can be separated rapidly, and the content of free fluorine and monofluorophosphate can be determined rapidly. The ion chromatography method replaces a detection method in the national standard, and the detection time for monofluorophosphate radical in sodium monofluorophosphate can be shortened to 20 min from 26 h in the national standard.

Description

Technical field [0001] The invention relates to the field of chemical detection and analysis, in particular to a method for rapidly determining free fluorine and monofluorophosphate in sodium monofluorophosphate. Background technique [0002] Sodium monofluorophosphate is a new type of chemical product. The detection method of free fluorine and monofluorophosphate in the national standard (GB 24567-2009 sodium monofluorophosphate for toothpaste industry) is extremely complicated, which takes about 26 hours and the process It is cumbersome, and it is not easy to find the cause of the problem. Summary of the invention [0003] The invention provides a method for rapidly determining free fluorine and monofluorophosphate in sodium monofluorophosphate, which can accurately and rapidly detect the content of free fluorine and monofluorophosphate in sodium monofluorophosphate. [0004] The technical scheme adopted by the present invention is: [0005] A method for rapid determination of fre...

Claims

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Application Information

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IPC IPC(8): G01N30/96G01N30/06G01N30/16
CPCG01N30/06G01N30/16G01N30/96G01N2030/062
Inventor 李红张小琴杜建侠
Owner 湖北省兴发磷化工研究院有限公司
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