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Reagent for determining hexavalent chromium by spectrophotometry

A technology of spectrophotometry and hexavalent chromium, applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of good environmental protection performance, convenient use, and convenient use

Inactive Publication Date: 2010-12-01
SHENZHEN SINSCHE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems existing in the existing diphenylcarbazide visible spectrophotometric method for measuring hexavalent chromium in water, the purpose of the present invention is to provide a method that uses only one reagent, that is, only needs to be mixed with one reagent when used, and can It is extremely convenient to use, and does not contain acetone, which is harmful to the human body and pollutes the environment. Reagent for the spectrophotometric determination of hexavalent chromium

Method used

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Embodiment Construction

[0009] The present invention is described in further detail below in conjunction with embodiment.

[0010] A spectrophotometric reagent for determining hexavalent chromium is characterized in that the formula is composed of concentrated sulfuric acid, distilled water, absolute ethanol and diphenylcarbazide.

[0011] To prepare 100ml of this spectrophotometric reagent for determining hexavalent chromium, the preparation steps are as follows: first take 8ml of concentrated sulfuric acid and dissolve it in a small amount of distilled water, then add 60ml of absolute ethanol and 0.2g of diphenylcarbazide, shake well and dissolve, then use Distilled water to make up to 100ml.

[0012] Utilize above-mentioned reagent to use spectrophotometric method to measure hexavalent chromium in water:

[0013] To draw the standard curve, add 0, 0.20, 0.50, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00ml of chromium standard solution to nine 20ml stoppered colorimetric tubes, and add 2ml of the above-...

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Abstract

The invention discloses a reagent for determining hexavalent chromium by spectrophotometry, which is characterized in that the reagent is prepared from concentrated sulfuric acid, water, absolute ethyl alcohol and diphenylcarbazide based on the weight ratio of 10-20:20-50:60-90:0.05-0.5. The invention also discloses a method for preparing the reagent for determining the hexavalent chromium by spectrophotometry, comprising the steps of dissolving the concentrated sulfuric acid in a little of water, adding the absolute ethyl alcohol and diphenylcarbazide, evenly shaking and dissolving, and adding the balance of water. The invention has the advantages of convenient use and good environment-friendly performance.

Description

technical field [0001] The invention relates to a reagent for determining hexavalent chromium in environmental monitoring, in particular to a reagent that only needs to be prepared with one reagent, which is very convenient to use, and does not contain acetone that is harmful to the human body and pollutes the environment. Reagents for the spectrophotometric determination of hexavalent chromium. Background technique [0002] Chromium is one of the essential trace elements for living organisms. The lack of chromium can lead to metabolic disorders of sugar, fat and other substances, but excessive intake is harmful to organisms and humans. The toxicity of chromium has a great relationship with its existing form: trivalent chromium compounds are almost non-toxic and necessary for humans and animals; on the contrary, hexavalent chromium compounds are highly oxidizing and carcinogenic. In general, hexavalent chromium is 100 times more toxic than trivalent chromium. my country s...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 黄晓平
Owner SHENZHEN SINSCHE TECH
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