Method for detecting chromium ions in water

A detection method, a technology of chromium ions, which is applied in the field of food analysis, can solve problems such as pollution of the environment, and achieve the effect of simple operation and low usage

Inactive Publication Date: 2015-09-30
DONGCHEN LEADER TESTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, chromate compounds are often added to cooling water to inhibit corrosion of equipment, and enter into wastewater through cooling water, polluting the environment

Method used

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  • Method for detecting chromium ions in water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The detection method of chromium ion in water comprises the following steps:

[0015] Step 1, in parts by weight, take 2 parts of diphenylcarbazide, 3 parts of sodium chloride, 4 parts of ammonium citrate, 2 parts of disodium edetate, 6 parts of glycine, N, N-dimethyl 7 parts of p-phenylenediamine and 5 parts of sodium xylene sulfonate were mixed and ground to obtain detection reagent A;

[0016] Step 2, preparing 1+7 sulfuric acid solution to obtain detection reagent B;

[0017] Step 3, in parts by weight, take 0.1 part of detection reagent A, add 0.3 part of detection reagent B and 5 parts of water sample in sequence, mix, and measure the absorbance at 540 nm after standing for 5 minutes to calculate the content of chromium ions.

[0018] In step 1, a mortar is used for grinding, and the particle size after grinding is 80 mesh.

Embodiment 2

[0020] The detection method of chromium ion in water comprises the following steps:

[0021] Step 1, in parts by weight, take 1 part of diphenylcarbazide, 2 parts of sodium chloride, 3 parts of ammonium citrate, 1 part of disodium edetate, 2 parts of glycine, N, N-dimethyl 3 parts of p-phenylenediamine and 1 part of sodium xylene sulfonate were mixed and ground to obtain detection reagent A;

[0022] Step 2, preparing 1+7 sulfuric acid solution to obtain detection reagent B;

[0023] Step 3, in parts by weight, take 0.5 parts of detection reagent A, add 1.1 parts of detection reagent B and 7 parts of water sample in sequence, mix, and measure the absorbance at 540 nm after standing for 5 minutes to calculate the content of chromium ions. .

[0024] In step 1, a mortar is used for grinding, and the particle size after grinding is 90 mesh.

Embodiment 3

[0026] The detection method of chromium ion in water comprises the following steps:

[0027] Step 1, in parts by weight, take 4 parts of diphenylcarbazide, 6 parts of sodium chloride, 7 parts of ammonium citrate, 5 parts of disodium edetate, 7 parts of glycine, N, N-dimethyl 8 parts of p-phenylenediamine and 7 parts of sodium xylene sulfonate were mixed and ground to obtain detection reagent A;

[0028] Step 2, preparing 1+7 sulfuric acid solution to obtain detection reagent B;

[0029] Step 3, in parts by weight, take 0.7 parts of detection reagent A, add 1.5 parts of detection reagent B and 10 parts of water sample in sequence, mix, and measure the absorbance at 540 nm after standing for 5 minutes to calculate the chromium ion content.

[0030] Get water sample and chromium-containing waste water and measure by the detection method of embodiment 1 to 3, measure same water sample with national standard method simultaneously, the result is as follows:

[0031]

[0032] Fr...

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Abstract

The invention discloses a method for detecting chromium ions in water. The method comprises the following steps: mixing diphenylcarbazide, sodium chloride, ammonium citrate, ethylenediamine disodium tetraacetate, glycine, N,N-dimethyl-p-phenylenediamine and sodium xylene sulfonate, grinding so as to obtain a detection reagent A; preparing a 1+7 sulfuric acid solution so as to obtain a detection reagent B; and taking the detection reagent A, adding the detection reagent B and a water sample in sequence, mixing, standing for 5min, performing absorbancy detection at wave length being 540nm, and calculating the content of the chromium ions. The method disclosed by the invention is easy and fast to operate, and meets the green chemistry idea, the use amounts of reagent are small, and an organic solvent acetone is avoided.

Description

technical field [0001] The invention belongs to the technical field of food analysis, in particular to a method for detecting chromium ions in water. Background technique [0002] Chromium is one of the most widely distributed heavy metals in the earth's crust. The concentration of chromium in surface water is usually relatively low, in terms of μg / L, usually between 0.3-0.6μg / L. Chromium is an important trace metal and nutrient that is necessary for life and can lead to some physiological diseases if its content is insufficient. It is well known that soils become infertile when there is too much chromium in the soil, and that this toxic effect depends in part on the oxidized form of chromium. Chromium may exist in a variety of forms in nature, but generally, the trivalent and hexavalent oxidation states are in the majority, and each oxidation state has different biological, medical and toxicological properties. Trivalent chromium is an important element and a basic nutri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 熊开胜张海防谢建庭
Owner DONGCHEN LEADER TESTING
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