Determination method of hexavalent chromium in basic chromium sulfate

A determination method and hexavalent chromium technology, applied in the field of chemical analysis, can solve the problems of being easily absorbed by the human body, harmful to health, difficult to treat waste liquid, and harmful to the environment. Effects of Interfering Elements

Active Publication Date: 2019-12-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Application Information

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Problems solved by technology

Because organic reagents are highly volatile and highly toxic, they are easily absorbed by the human body during extraction and endanger health, and waste liquid treatment is difficult, and direct discharge is extremely harmful to the environment

Method used

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  • Determination method of hexavalent chromium in basic chromium sulfate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The mensuration of hexavalent chromium content in the basic chromium sulfate of embodiment 1

[0051] 1. Separation of hexavalent chromium: Weigh 5 samples of basic chromium sulfate to be tested, put 1.0000g of each sample in a 250mL beaker, add hot water at 75°C to dissolve the sample. Immediately after the sample was dissolved, 1.0 g of solid magnesium chloride and 0.3 g of ferric chloride were added to the test solution, stirred evenly, and the pH value of the test solution was adjusted to 10 with 0.1 mol / L sodium hydroxide solution. Incubate on a low-temperature heating plate at 70°C to 80°C for 40 minutes, filter while hot with medium-speed filter paper, wash the precipitate with hot water 8 times, transfer the filtrate into a 100.0mL volumetric flask, dilute to the mark with water, and mix well.

[0052] 2. Color development: Separate 50.0mL of the filtrate into a 100mL volumetric flask, adjust the pH to 6~7 with 0.1mol / L~0.2mol / L sulfuric acid, add 4.0mL of 2.57m...

Embodiment 2

[0058] The determination recovery rate of hexavalent chromium content in embodiment 2 basic chromium sulfate chromium

[0059] Take by weighing 4 parts of basic chromium sulfate samples in Example 1, each part of 1.0000g in a 250mL beaker, add 0.0, 2.0, 4.0, 6.0mL of Cr respectively 6+ Standard solution (prepared according to 3.10.2 in GB / T 223.12-1991, Cr 6+ The concentration of the standard solution is 2.0ug / mL) plus hot water at 75°C to dissolve the sample. Immediately after the sample is dissolved, add 1.0 g of solid magnesium chloride and 0.3 g of ferric chloride to the test solution, stir evenly, and adjust the pH of the test solution to about 1.0 with 0.1 mol / L sodium hydroxide solution. Incubate on a low-temperature heating plate at 80°C for 40 minutes, filter while hot with medium-speed filter paper, wash the precipitate with hot water 8 times, transfer the filtrate into a 100mL volumetric flask, dilute to the mark with water, and mix well. Separate 50.0mL of the fi...

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Abstract

The invention relates to a method for determination of hexavalent chromium in basic chromium sulfate and belongs to the technical field of chemical analysis. The method comprises dissolving a sample to be measured, immediately adding MgCl2 and FeCl3 into the solution, adjusting pH to about 10 so that chromium hydroxide precipitates completely, filtering and washing the precipitates to completely separate hexavalent chromium from trivalent chromium, and detecting the hexavalent chromium in the filtrate by a diphenylcarbazide spectrophotometry to obtain the content of hexavalent chromium. The method realizes elimination of interfering elements and complete separation of trivalent chromium and hexavalent chromium, prevents too high hexavalent chromium content caused by oxidation of trivalent chromium into hexavalent chromium in separation and has high accuracy and a good precision.

Description

technical field [0001] The invention relates to a method for determining hexavalent chromium in basic chromium sulfate, belonging to the technical field of chemical analysis. Background technique [0002] Basic chromium sulfate is an important inorganic chemical product, widely used in printing and dyeing, ceramics, green ink and tanning process. Vanadium-making enterprises use vanadium-chromium waste residue recovered from vanadium-containing wastewater as raw materials to prepare basic chromium sulfate, which not only improves enterprise efficiency, but also is an effective way to solve chromium-containing waste. The valence state of chromium in basic chromium sulfate is mainly trivalent chromium and trace amount of hexavalent chromium. The industry standard HG / T2678-2015 "Industrial Basic Chromium Sulfate" has strict regulations on the content of hexavalent chromium in basic chromium sulfate. The determination methods of hexavalent chromium mainly include spectrophotomet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 苏洋汪雪梅王凤
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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