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
4 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the adsorption of Cr(III) o...
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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.

Application Domain

Component separation

Technology Topic

DolomiteChromium +6


  • Heavy-metal chromium form separating method
  • Heavy-metal chromium form separating method
  • Heavy-metal chromium form separating method


  • Experimental program(1)

Example Embodiment

[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 significant effect on the separation of Cr(III) and Cr(VI).
[0022] Table 1. Dolomite separates Cr(III) and Cr(VI) in actual water samples.
[0024] a Indicates not detected;
[0025] b Indicates not added.


Particle size80.0 ~ 100.0mesh

Description & Claims & Application Information

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