Heavy-metal chromium form separating method

A separation method and heavy metal technology are applied in the field of environmental analysis to achieve the effects of wide source, obvious adsorption effect and low price.

Inactive Publication Date: 2012-08-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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However, the adsorption of Cr(III) o

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[0021] In Example 1, 30 μg / L Cr(III) and 20 μg / LCr(VI) were added to tap water, well water, and river water, respectively, and only 1000 μg / L Cr(III) was added to the electroplating wastewater and chromium residue extract. Use dolomite to separate Cr(III) and Cr(VI) from the above actual water samples: Take 12mL water samples respectively, and adsorb 4g dolomite in SPE cartridges at a flow rate of 0.7mL / min. Graphite furnace atomic absorption spectrometry (GFAAS) was used to measure the concentration of total Cr before adsorption (that is, the concentration of Total Cr including Cr(III) and Cr(VI)) and the concentration of Cr(III) after adsorption. Then use a spectrophotometer to detect the concentration of Cr(VI) after adsorption at a wavelength of 540nm. The experimental result is that no Cr(III) is detected after adsorption, and the measured Cr(VI) amount is the same as before adsorption (Table 1). Therefore, this embodiment illustrates that the present invention has a sign...

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Abstract

The invention relates to a heavy-metal chromium form separating method, which firstly utilizes dolomite as adsorption materials and is used for separation of Cr (VI) and Cr (III) in the natural water environment. According to indication of a series of tests, adsorption rate of the dolomite (80-100 meshes) in the natural water body to the Cr (III) is larger than 95% and is lower than 5% to the Cr (VI). Adsorbent used in the heavy-metal chromium form separating method is natural minerals, low in cost and convenient to be obtained, and the heavy-metal chromium form separating method is simple, fast and evident in separation effect. Accordingly, the heavy-metal chromium form separating method can be used for separating forms of Cr (III) and Cr (VI) in the water body.

Description

technical field [0001] The invention relates to the field of environmental analysis, in particular to a method for separating forms of heavy metal chromium. technical background [0002] Chromium (Cr) mainly exists in the environment in two forms: trivalent Cr(III) and hexavalent Cr(VI). These two forms of Cr have obvious differences in chemical properties, biological activities and toxicological levels. Cr(VI) is mainly anion CrO 4 2- and Cr 2 o 7 2- It exists in different forms, has high chemical activity, high solubility and high toxicity, and is easy to cause harm to animals, plants and humans. It is a carcinogen confirmed by the World Health Organization. On the contrary, Cr(III) is an essential trace element in the process of carbohydrate and fat metabolism. An appropriate amount of Cr(III) can reduce blood sugar concentration in plasma and improve the body’s ability to respond to stress. The lack of Cr(III) in the human body will cause Disorders of glucose metab...

Claims

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Application Information

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IPC IPC(8): G01N30/50G01N30/74
Inventor 景传勇余思伍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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