Method for detecting content of phosphate of different type in complex sodium phosphate product

A sodium phosphate salt and detection method technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of long time-consuming, unguaranteed repeatability and stability of results, large error of test results, etc., and achieve repeatability and good stability

Active Publication Date: 2014-09-03
HUBEI XINGFA CHEM GRP CO LTD
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Problems solved by technology

According to its application principle, this method can also be used for the determination of compound phosphate by selecting appropriate separation conditions, but it takes a long time, and the test results have large artificial errors, and only one sample can be analyzed at a time, so the repeatability and stability of the results sex is not guaranteed

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  • Method for detecting content of phosphate of different type in complex sodium phosphate product
  • Method for detecting content of phosphate of different type in complex sodium phosphate product
  • Method for detecting content of phosphate of different type in complex sodium phosphate product

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Embodiment Construction

[0018] A method for preparing food-grade phosphoric acid by using medium and low-grade phosphate rock, comprising the following steps:

[0019] Step 1: Accurately weigh 1.0002g of the compound phosphate sample, dissolve it in pure water, dilute it into a 1000mL volumetric flask, and shake well. Draw the filtrate and inject it into an ion chromatograph equipped with an AS11-HC anion exchange column for detection. The ion chromatograph is used to carry out gradient elution to the solution, separate the different forms of phosphate in the sample, and measure the area response value;

[0020] Step 2: prepare 4 groups of standard solutions of sodium orthophosphate, sodium pyrophosphate, sodium polyphosphate and sodium trimetaphosphate standard solutions with a concentration of 2-20 mg / L, and measure the corresponding concentration of the standard solution by ion chromatography under the same conditions Area response value, calculate FI=cI / SI;

[0021] Among them, I represents pos...

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Abstract

The invention provides a method for detecting the content of phosphates of different types in a complex sodium phosphate product, comprising: diluting the complex phosphate product with pure water, eluting the solution in gradient by an ion chromatograph, separating the phosphates of different types in a sample, and determining a response value; preparing four groups of standard solutions of sodium orthophosphate, sodium pyrophosphate, sodium polyphosphate and sodium trimetaphosphate in a concentration range of 2-20mg / L, determining the corresponding area response values of the standard solutions by the ion chromatograph under same conditions, and calculating by the formula FI=cI / SI; selecting a average value of FI of the four groups of solutions of each component, to determine a correction factor of each component, and finally, calculating the content of each component in the complex sodium phosphate products. The product provides a method for simultaneously detecting the content of phosphates of different types in a complex sodium phosphate product by a simple method and a precision apparatus. The detection result is good in repeatability and stability. The method is suitable as a common quantitative analysis method.

Description

technical field [0001] The invention discloses a method for detecting the contents of phosphates in different forms in compound sodium phosphate salt products. Background technique [0002] In recent years, the technology of using ion chromatography to determine various anions has been successfully applied to many industries. At present, there are no reports on the determination of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate and sodium trimetaphosphate in compound sodium phosphate salt. The different forms of phosphate in a single sodium tripolyphosphate product are separated and measured using ion exchange resin according to GB9983-2008. According to its application principle, this method can also be used for the determination of compound phosphate by selecting appropriate separation conditions, but it takes a long time, and the test results have large artificial errors, and only one sample can be analyzed at a time, so the repeatability and stabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 李国璋杜建侠龚礼胜张永萍徐冉李红
Owner HUBEI XINGFA CHEM GRP CO LTD
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