Method for detecting trace hydroxylamine in water through ABTS free radical fading spectrophotometry method

A technology of spectrophotometry and free radicals, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of high detection limit, poor selectivity, high equipment requirements, etc., and achieve satisfactory selectivity

Inactive Publication Date: 2013-02-20
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

However, most of these methods have cumbersome pretreatment, high equipment requirements, high detection limits, and poor selectivity.

Method used

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  • Method for detecting trace hydroxylamine in water through ABTS free radical fading spectrophotometry method
  • Method for detecting trace hydroxylamine in water through ABTS free radical fading spectrophotometry method
  • Method for detecting trace hydroxylamine in water through ABTS free radical fading spectrophotometry method

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Embodiment

[0017] (1) Prepare a standard solution of hydroxylamine with a concentration of 1.0mg / L, where the concentration of hydroxylamine is calculated as nitrogen; take 0.00-2.00mL of a standard solution of hydroxylamine, and add water to the 10mL mark. Add 10.00mL ABTS free radical measurement solution, shake well; heat in a 35°C water bath for 10min, pay attention to keep the colorimetric tube sealed to prevent water vapor from entering; cool for 10min, measure the absorbance A at a wavelength of 734nm, and calculate ΔA= A 空白 -A 样品 ; Draw a standard curve with hydroxylamine content versus ΔA;

[0018] (2) Take 10.00mL of the water sample to be tested, put it in a colorimetric tube, and operate according to step (1). During this process, the green ABTS free radical reacts with hydroxylamine in water to fade, and the full-wavelength scanning is carried out by a UV-visible spectrophotometer. The residual ABTS free radical has a strong absorption peak at 730-740nm, and the optimal...

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Abstract

The present invention relates to a method for detecting trace hydroxylamine in water by using an ABTS free radical (2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)free radical) fading reaction principle, and belongs to the technical field of water pollution control and water quality detection. The method comprises the following steps: a, preparing an ABTS free radical use solution and a hydroxylamine use solution; b, mixing the two solutions, and heating for 10 min in a water bath kettle; and c, determining absorbance of a hydroxylamine solution requiring detection at a suitable wavelength through colorimetry by using a spectrophotometer. The detection method has characteristics of simple operation, high sensitivity, low detection limit, good selectivity, cheap equipment and low detection cost, and is an economical, fast and intuitive quantitative determination method.

Description

technical field [0001] The invention relates to a method for detecting trace amounts of hydroxylamine in water by ABTS free radical fading spectrophotometry, belonging to the fields of water pollution control and water quality detection. Background technique [0002] Hydroxylamine is a commonly used industrial reagent, widely used in the electronics and pharmaceutical industries. Trace amounts of hydroxylamine are toxic to humans, animals and plants. Because of its harmfulness, some governments have stipulated that the concentration of hydroxylamine in sewage should be below the ppm level in order to ensure the safety of local organisms. [0003] Currently, methods for detecting hydroxylamine include high performance liquid chromatography, double amperometric titration, and polarography. However, most of these methods have cumbersome pretreatment, high equipment requirements, high detection limits, and poor selectivity. Therefore, no matter from the consideration of indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 黄鑫吴雪飞王隆勇徐泽羿蒲韵竹
Owner SHANGHAI UNIV
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