Preparation method and use method for color development detecting tablets for determining hexavalent chromium in water

A hexavalent chromium and detection chip technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as reports on the development of hexavalent chromium detection chips that have not yet been discovered, and achieve the effect of low price and easy portability

Inactive Publication Date: 2013-02-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no reports on the development of hexavalent chromium detection sheets have been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Chromogenic detection sheet preparation.

[0016] Weigh 4g of polyethylene glycol 4000 and melt it completely on a water bath at 50°C, pour 1g of DPC (diphenylcarbazide) powder into it, mix evenly, and grind it into powder after cooling. Take 1g of this powder and mix it with 120g of sulfamic acid, spray a little water mist, and mix well to get a mixed powder. Take 0.6g of this mixed powder and put it into a tablet machine (model YP-15A), and press it into a diameter under a pressure of 5MPa. 10mm tablet, that is, a chromogenic test piece.

Embodiment 2

[0018] The color detection sheet obtained in Example 1 of the present invention was used to measure the concentration of hexavalent chromium in certain industrial wastewater.

[0019] Take 10ml of a certain domestic sewage in a 10ml colorimetric tube, immerse a piece of color-developing detection piece, shake the colorimetric tube for 10 minutes to dissolve it into a purple-red solution, use a portable spectrophotometer (PORS-15V portable spectrometer Beijing Puyi Company), in the The absorbance of the solution was measured at a wavelength of 540nm, and the concentration of hexavalent chromium in the industrial wastewater was 0.088mg / L, which was consistent with the result of 0.079mg / L by the traditional DPC spectrophotometry (solution reagent), indicating that the color-developing test piece was used to determine the concentration of an industrial The concentration of hexavalent chromium in wastewater is accurate and reliable.

Embodiment 3

[0021] The color detection sheet obtained in Example 1 of the present invention was used to measure the concentration of hexavalent chromium in certain industrial wastewater.

[0022] Take 10ml of a certain domestic sewage in a 10ml colorimetric tube, immerse a piece of color-developing detection piece, shake the colorimetric tube for 10 minutes to dissolve it into a purple-red solution, use a portable spectrophotometer (PORS-15V portable spectrometer Beijing Puyi Company), in the The absorbance of the solution was measured at a wavelength of 540nm, and the concentration of hexavalent chromium in the industrial wastewater was 0.477mg / L, which was consistent with the result of 0.450mg / L by the traditional DPC spectrophotometry (solution reagent), indicating that the color-developing test piece was used to determine the concentration of an industrial The concentration of hexavalent chromium in wastewater is accurate and reliable.

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Abstract

The invention relates to a preparation method and a use method for color development detecting tablets for determining hexavalent chromium in water. The color development detecting tablets are prepared by mixing diphenylcarbazide, sulfamic acid and polyethylene glycol 4000 and are prepared into tablets by a tabletting method. The color development detecting tablets are directly soaked into 10ml of water sample when used, the solution is gently shaken for 10 minutes to dissolve the color development detecting tablets, and a portable spectrophotometer is used for measuring to acquire the concentration of the hexavalent chromium in the water. The color development detecting tablets are convenient to carry and easy to preserve; any additional reagents are not required when the color development detecting tablets are used; the determination results are accurate and reliable; and the color development detecting tablets are suitable for on-site quantitative detection of the hexavalent chromium in water bodies, such as surface water, underground water, domestic sewage, industrial wastewater and the like.

Description

technical field [0001] The invention relates to a method for preparing and using a color detection sheet for determining hexavalent chromium in water, and belongs to the technical field of environmental monitoring. Background technique [0002] With the rapid development of industrial technology, sudden environmental pollution accidents continue to increase, threatening human health, destroying the ecological environment, and seriously restricting ecological balance and social and economic development. There are many problems to be solved to prevent sudden pollution accidents. The first task is to establish emergency monitoring methods and technologies. Once a pollution accident occurs, it can be quickly put into monitoring, and accurate pollution data can be provided in the shortest time. Measures provide a scientific basis. Therefore, for sudden environmental pollution accidents with strong time and space characteristics and significant random changes, a timely and accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/31
Inventor 郜洪文许夏伟陈玲李明利
Owner TONGJI UNIV
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