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Method for determining content of lanthanum oxide in lanthanum phosphate

A technology of lanthanum oxide and lanthanum phosphate, which is applied in the field of chemical analysis, can solve the problems of cumbersome steps, high cost of measurement, and difficult operation, and achieve the effects of good stability, low cost, and relatively small error

Inactive Publication Date: 2020-08-28
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the present method for measuring lanthanum oxide or La element with cumbersome steps, difficult operation and high cost of determination, the present invention establishes a titration method for determining lanthanum oxide in lanthanum phosphate which is more accurate, has good controllability and has a wide application range. The method does not require large instruments, and the measurement error is small, and the relative error is less than 1%.

Method used

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  • Method for determining content of lanthanum oxide in lanthanum phosphate
  • Method for determining content of lanthanum oxide in lanthanum phosphate
  • Method for determining content of lanthanum oxide in lanthanum phosphate

Examples

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Embodiment 1

[0011] Step 1: Prepare zinc standard solution

[0012] Weigh 0.1300g metal zinc particles into a beaker, add 20ml of hydrochloric acid with a concentration of 0.1mol / L, after dissolving, cool to room temperature, transfer to a 1000ml volumetric flask, and make to volume. The prepared zinc standard solution has a solubility of 0.1300g / L.

[0013] Step 2: Prepare hexamethylenetetramine-hydrochloric acid buffer solution

[0014] Weigh 100g of disodium hexamethylenetetramine, add 200ml of water and 10ml of concentrated hydrochloric acid to dissolve it, add water to a volume of 500ml, measure the pH value of the solution with a pH meter, and adjust the pH value to 5.4-5.5.

[0015] Step 3: Calibration of EDTA

[0016] Use a pipette to accurately pipette 10.00ml of zinc standard solution into a 250ml conical flask, add 10.00ml of hexamethylenetetramine-hydrochloric acid buffer solution to adjust the pH (5.0-6.0), drop 2-3 drops of xylenol orange (The color is purple at this time)...

Embodiment 2

[0034] Step 1: Prepare zinc standard solution

[0035] Weigh 0.1300g metal zinc particles into a beaker, add 20ml of hydrochloric acid with a concentration of 0.1mol / L, after dissolving, cool to room temperature, transfer to a 1000ml volumetric flask, and make to volume. The prepared zinc standard solution has a solubility of 0.1300g / L.

[0036] Step 2: Prepare hexamethylenetetramine-hydrochloric acid buffer solution

[0037] Weigh 100g of disodium hexamethylenetetramine, add 200ml of water and 10ml of concentrated hydrochloric acid to dissolve it, add water to a volume of 500ml, measure the pH value of the solution with a pH meter, and adjust the pH value to 5.4-5.5.

[0038] Step 3: Calibration of EDTA

[0039] Use a pipette to accurately pipette 10.00ml of zinc standard solution into a 250ml conical flask, add 10.00ml of hexamethylenetetramine-hydrochloric acid buffer solution to adjust the pH (5.0-6.0), drop 2-3 drops of xylenol orange (The color is purple at this time)...

Embodiment 3

[0058] Step 1: Prepare zinc standard solution

[0059] Weigh 0.1300g metal zinc particles into a beaker, add 20ml of hydrochloric acid with a concentration of 0.1mol / L, after dissolving, cool to room temperature, transfer to a 1000ml volumetric flask, and make to volume. The prepared zinc standard solution has a solubility of 0.1300g / L.

[0060] Step 2: Prepare hexamethylenetetramine-hydrochloric acid buffer solution

[0061] Weigh 100g of disodium hexamethylenetetramine, add 200ml of water and 10ml of concentrated hydrochloric acid to dissolve it, add water to a volume of 500ml, measure the pH value of the solution with a pH meter, and adjust the pH value to 5.4-5.5.

[0062] Step 3: Calibration of EDTA

[0063] Use a pipette to accurately pipette 10.00ml of zinc standard solution into a 250ml conical flask, add 10.00ml of hexamethylenetetramine-hydrochloric acid buffer solution to adjust the pH (5.0-6.0), drop 2-3 drops of xylenol orange (The color is purple at this time)...

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Abstract

The invention discloses a method for determining the content of lanthanum oxide in lanthanum phosphate. Hydrochloric acid is used as a solvent, and EDTA is used as a complexing titrant; lanthanum oxide is dissolved in the lanthanum phosphate sample by adopting hydrochloric acid; and the concentration of lanthanum ions dissolved by hydrochloric acid is titrated by adopting EDTA, and the content oflanthanum oxide in lanthanum phosphate is obtained through the mass ratio relationship between lanthanum oxide and lanthanum ions. Large instruments are not needed, the cost is low, the method is simple and easy to implement, the stability is good, the measurement error is small, and the relative error is smaller than 1%.

Description

technical field [0001] The invention discloses a method for measuring the content of lanthanum oxide in lanthanum phosphate, which specifically relates to using hydrochloric acid as a solvent to dissolve lanthanum oxide in a lanthanum phosphate sample; adopting EDTA as a complexing agent to titrate the dissolved lanthanum ion concentration in hydrochloric acid, and then passing lanthanum oxide and lanthanum oxide The mass ratio relationship of lanthanum ions is used to determine the content of lanthanum oxide in lanthanum phosphate. The invention discloses a method for measuring the content of lanthanum oxide in lanthanum phosphate, which belongs to the field of chemical analysis. Background technique [0002] The reported methods for the determination of lanthanum oxide or La elements include X-ray fluorescence spectrometry, graphite furnace method and ICP-AES method. X-ray fluorescence spectrometry first uses ultrasonic dispersion to disperse the sample, prepares the samp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 刘松龙钟学明徐玉娜
Owner NANCHANG HANGKONG UNIVERSITY