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Chemical analysis determination method of zinc content of molecular sieve

A determination method and molecular sieve technology, applied in the field of analytical chemistry, can solve the problems of system error and high cost of instruments and equipment, and achieve the effects of low cost, high accuracy, and eliminating the influence of zinc content determination.

Inactive Publication Date: 2016-03-30
天津神能科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing zinc content determination methods have been widely used in the chemical industry, but there is no chemical analysis method only for the zinc content in molecular sieves
For the fluorescence method, flow injection method, spectrophotometry and other methods used in the instrument analysis method to measure zinc, the cost of the equipment used is relatively high, and system errors are prone to occur in the analysis process
[0003] At present, some patents (such as CN95106238, CN201210115448, CN201410184714.2) related to the determination of zinc content have been published at home and abroad. Some strong oxidants and more toxic reagents will be used in the analysis process. It is impossible to achieve under the condition

Method used

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  • Chemical analysis determination method of zinc content of molecular sieve
  • Chemical analysis determination method of zinc content of molecular sieve
  • Chemical analysis determination method of zinc content of molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The measurement process is as follows:

[0044] 1. Calibration: the titer T of EDTA standard solution to zinc:

[0045] Pipette 15.00 mL of zinc standard solution, add a little water, add 20 mL of hexamethylenetetramine (30%), a drop of xylenol orange, and titrate with EDTA standard solution to yellow as the end point.

[0046] Calculation: Calculate the titer T of EDTA standard solution to zinc according to the following formula:

[0047] T = V 1 × c V

[0048] Where: V 1 - Pipette the volume mL of zinc standard solution.

[0049] c—concentration of zinc standard solution in g / mL.

[0050] V - Volume mL of EDTA standard solution consumed for titration.

[0051] T = 15.00 × 0.0001 1.91 = 0.00079 ...

Embodiment 2

[0058] Embodiment 2 (sample M, ZnO content is 0.45%):

[0059] Weigh 0.9891 g of the sample, and all the other conditions are the same as in Example 1.

[0060]

[0061] First determination: Z n O ( % ) = 0.44 × 0.00079 × 10 × 81 / 65 0.9891 = 0.4379 % .

[0062] Second determination: Z n O ( % ) = 0.45 × 0.00079 × 10 × 81 / 65 0.9891 = 0.4479 % .

[0063] T...

Embodiment 3

[0064] Embodiment three (sample N, ZnO content is 0.50%):

[0065] Weigh 0.8201 g of the sample, add 12 mL of ammonium fluoride solution at room temperature around 30°C, and the rest of the conditions are the same as in Example 1.

[0066]

[0067] First determination: Z n O ( % ) = 0.42 × 0.00079 × 10 × 81 / 65 0.8201 = 0.5042 % .

[0068] Second determination: Z n O ( % ) = 0.41 × 0.00079 × 10 × 81 / 65 0.820...

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Abstract

The invention provides a chemical analysis determination method of zinc content of molecular sieve. The chemical analysis determination method comprises following steps: titer T of EDTA standard solution on zinc is obtained via calibration; a sample is dissolved in a strong base, and the pH value of an obtained mixture is adjusted to be lower than 7; a masking agent is added; and EDTA complexometric titration is adopted to determining the content of zinc in molecular sieve. In the chemical analysis determination method, the strong base is adopted to dissolve the sample; and ammonium fluoride and tartaric acid are taken as the masking agent; so that influences of interfering ions on determination results are avoided; the operation steps of the chemical analysis determination method are simple; and accuracy is high.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for chemical analysis and determination of phosphorus content in molecular sieves. Background technique [0002] The existing zinc content determination methods have been widely used in the chemical industry, but there is no chemical analysis method only for the zinc content in molecular sieves. For the fluorescence method, flow injection method, spectrophotometry and other methods used in the instrumental analysis method to measure zinc, the cost of the equipment used is relatively high, and system errors are prone to occur in the analysis process. [0003] At present, some patents (such as CN95106238, CN201210115448, CN201410184714.2) related to the determination of zinc content have been published at home and abroad. Some strong oxidants and more toxic reagents will be used in the analysis process. conditions are not possible. [0004] Therefore, it is extremely ...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/79
CPCG01N31/16G01N21/79
Inventor 王亚楠王震宇刘雁李晓文
Owner 天津神能科技有限公司
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