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Test paper for divalent manganese ions as well as preparation method and application thereof

A technique for detecting divalent manganese ions and test paper, which is applied in the field of analytical chemistry, can solve the problems of long detection time, low detection sensitivity, complicated operation steps, etc., and achieves the effects of simple application operation, high sensitivity and few operation steps.

Inactive Publication Date: 2019-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up: the literature method has complex operation steps, or requires expensive instruments, or requires a lot of reagents for detection, or takes a long time for detection; the most critical thing is low detection sensitivity (greater than 0.1mg / L)

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a test paper for detecting divalent manganese ions and a preparation method and application thereof. The preparation method includes the following steps:

[0033] (1) Take 1.0 g of CMC-Na with a substitution degree of 0.88 and prepare a 1.0% CMC-Na aqueous solution, and add 0.1% TbCl according to the mass ratio CMC-Na:Tb=20:5 3 Aqueous solution, a mixed solution, CMC-Na and TbCl in the mixed solution 3 Reaction occurs to prepare CMC / Tb 3+ ;

[0034] (2) Purified CMC / Tb 3+ The purification method is to centrifuge and separate the mixed solution obtained in step (1) at a speed of 20000 rpm, and disperse the solid part after centrifugation in 50 mL of 80% ethanol aqueous solution, stir to fully disperse, and repeat the centrifugation. Separation-washing with ethanol 4 times, drying at 50℃, and grinding into powder to obtain CMC / Tb 3+ Powder; CMC / Tb 3+ Add the powder to the water and stir evenly to obtain 0.5% CMC / Tb 3+ Suspension

[0035] (3) Use non-fluo...

Embodiment 2

[0043] This embodiment provides a test paper for detecting divalent manganese ions and a preparation method and application thereof. The preparation method includes the following steps:

[0044] (1) Take 1.0 g of CMC-Na with a degree of substitution of 0.90, prepare a 1.5% CMC-Na aqueous solution, and add 0.2% TbCl according to the mass ratio CMC-Na:Tb=15:3 3 Aqueous solution, a mixed solution, CMC-Na and TbCl in the mixed solution 3 Reaction occurs to prepare CMC / Tb 3+ ;

[0045] (2) Purified CMC / Tb 3+ The purification method is to centrifuge and separate the mixed solution obtained in step (1) at a speed of 20000 rpm, and disperse the solid part after centrifugation in 50 mL of 80% ethanol aqueous solution, stir to fully disperse, and repeat the centrifugation. Separation-washing with ethanol 4 times, drying at 50℃, and grinding into powder with a ball mill to obtain CMC / Tb 3+ Powder; CMC / Tb 3+ Add the powder to the water and stir evenly to obtain a CMC / Tb with a mass fraction of ...

Embodiment 3

[0055] Use test paper two to prepare 1mmol / L AgNO 3 Solution. AgNO 3 The pH of the solution = 3; test with test paper two; the test paper does not change color. It shows that the method of the invention is not affected by Ag + , NO 3 - interference.

[0056] Add the known Mn described in Table 2 to the above example 2+ The concentration of the aqueous solution was tested, and the results were the same as in Table 3. The concentration of divalent manganese ions measured by the method of the invention reached 0.0085 mg / L, and the color changed. See Table 3.

[0057] table 3

[0058] Manganese ion concentration mg / L Test paper color 0.00 (contrast) Navy (++++) 00025 Navy (++++) 0.0050 Light blue (+++) 0.0085 colorless 0.0090 Light green (+) 0.0100 Light green (+) 0.0500 Light green (++) 0.0800 Dark green (+++)

[0059] +: indicates the degree of color

[0060] This effect cannot be achieved by ammonium persulfate spectrophotometry.

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Abstract

The invention discloses a test paper for divalent manganese ions as well as a preparation method and application thereof. The preparation method of the test paper comprises steps that: a) sodium carboxymethylcellulose (CMC-Na) is used to react with TbCl3 to prepare CMC / Tb3 + complex; b) purified CMC / Tb3 + complex is prepared into solution, and is coated on non-fluorescent paper, and then dried. The tested solution is dripped on the test paper, and the test paper is observed under ultraviolet light, and then whether the test paper contains divalent manganese ions and the corresponding concentration range thereof can be determined; and at last, the detection limit is that the manganese ion is more than 0.0050 mg / L. The test paper for the divalent manganese ions is simple and convenient to apply and operate, high in sensitivity and capable of achieving rapid detection.

Description

Technical field [0001] The invention belongs to the technical field of analytical chemistry, and relates to a divalent manganese ion detection test paper and a preparation method and application thereof. Background technique [0002] Manganese is one of the more abundant metals in the earth's crust. Manganese is a frequently tested item in drinking water quality analysis. The sanitary standard of drinking water in my country strictly stipulates the content of manganese: the concentration of manganese ion is not more than 0.1mg / L. [0003] At present, there are three methods for detecting divalent manganese ions in water: atomic absorption spectrophotometry, ammonium persulfate spectrophotometry, and formaldehyde oxime spectrophotometry. The atomic absorption method has high sensitivity and can be directly used for the determination of manganese in water, but requires an expensive instrument-atomic absorption spectrometer; the formaldoxime method is an ISO standard method with hig...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 叶君张明明熊犍
Owner SOUTH CHINA UNIV OF TECH
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