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: 2013-04-17
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

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Embodiment Construction

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

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

[0020] Step 2: Prepare 4 standard solutions of 2-20mg / L sodium orthophosphate, sodium pyrophosphate, sodium polyphosphate and sodium trimetaphosphate standard solutions. Under the same conditions, determine the corresponding standard solutions by ion chromatography. Area response value, calculated FI=cI / SI;

[0021] Where I means positive, pyrophosphate, poly, partial, cI means sodium orthophosphate, sodium...

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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 present invention is a method for detecting the content of different forms of phosphate in a compound sodium phosphate product. Background technique [0002] In recent years, the use of ion chromatography to determine a variety of anions technology has been successfully applied to many industries. At present, there have been no reports on the determination of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate and sodium trimetaphosphate in the compound sodium phosphate. The different forms of phosphates in a single sodium tripolyphosphate product are determined by GB9983-2008 and separated and determined by ion exchange resin. 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. The results are repeatable a...

Claims

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Application Information

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Patent Type & Authority Applications(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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