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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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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the adsorption of Cr(III) on dolomite has not been reported yet.

Method used

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Examples

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Embodiment 1

[0021] Example 1 Add 30 μg / L Cr(III) and 20 μg / LCr(VI) to tap water, well water and river water respectively, and only add 1000 μg / L Cr(III) to electroplating wastewater and chromium slag extract. Use dolomite to separate Cr(III) and Cr(VI) from the above actual water samples: take 12mL water samples respectively, and absorb them in SPE cartridges with 4g dolomite at a flow rate of 0.7mL / min. The concentration of total Cr before adsorption (that is, the concentration of Cr(III) and Cr(VI) included in Total Cr) and the concentration of Cr(III) after adsorption were measured by graphite furnace atomic absorption spectrometry (GFAAS). Then use a spectrophotometer to detect the concentration of Cr(VI) after adsorption at a wavelength of 540 nm. The result of the experiment was that Cr(III) was not detected after adsorption, but the amount of Cr(VI) measured was consistent with that before adsorption (Table 1). Therefore, this example illustrates that the present invention has a r...

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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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