Heavy-metal chromium form separating method

[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.

[0023]

[0024] a Indicates not detected;

[0025] b Indicates not added.