The simple Hg(II)-detection system was studied and developed using dithizone nanofiber loaded
membrane. Dithizone is one of the most frequently used chemical substances for Hg(II) ions extraction in
water. Hg(II)-dithizone complex substance [Hg(HDith)2] is stable in acidic condition and, presenting with
the orange-brown color. To prepare dithizone nanoloaded membrane, dithizone solution (in acetone) was
mixed in aqueous solution with vigorous stirring. After dithizone nanofiber dispersion was formed, the
aqueous dithizone was filtered through the cellulose ester membrane. Adding ascorbic acid as a reducing
agent during nanofiber preparation step and keeping dithizone membrane in aluminum bag with oxygen
absorber under vacuum would improve the stability of dithizone against oxidation from air and/or light. The
Hg(II)-detection was performed by simply filtering solution through the dithizone membrane and, then,
quantitatively analyzing by the colorimetric equipment. It was found that the concentration range of Hg(II)-
detection can be altered with sample volume. By this technique, the detection limit can be achieved as low as
0.057 ppb with sufficient precision and repeatability. Practically, it could be applied to Hg(II)-determination
in real samples from environment such as artificial waste water, river water and sea water.
The simple Hg(II)-detection system was studied and developed using dithizone nanofiber loadedmembrane. Dithizone is one of the most frequently used chemical substances for Hg(II) ions extraction inwater. Hg(II)-dithizone complex substance [Hg(HDith)2] is stable in acidic condition and, presenting withthe orange-brown color. To prepare dithizone nanoloaded membrane, dithizone solution (in acetone) wasmixed in aqueous solution with vigorous stirring. After dithizone nanofiber dispersion was formed, theaqueous dithizone was filtered through the cellulose ester membrane. Adding ascorbic acid as a reducingagent during nanofiber preparation step and keeping dithizone membrane in aluminum bag with oxygenabsorber under vacuum would improve the stability of dithizone against oxidation from air and/or light. TheHg(II)-detection was performed by simply filtering solution through the dithizone membrane and, then,quantitatively analyzing by the colorimetric equipment. It was found that the concentration range of Hg(II)-detection can be altered with sample volume. By this technique, the detection limit can be achieved as low as0.057 ppb with sufficient precision and repeatability. Practically, it could be applied to Hg(II)-determinationin real samples from environment such as artificial waste water, river water and sea water.
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The simple Hg(II)-detection system was studied and developed using dithizone nanofiber loaded
membrane. Dithizone is one of the most frequently used chemical substances for Hg(II) ions extraction in
water. Hg(II)-dithizone complex substance [Hg(HDith)2] is stable in acidic condition and, presenting with
the orange-brown color. To prepare dithizone nanoloaded membrane, dithizone solution (in acetone) was
mixed in aqueous solution with vigorous stirring. After dithizone nanofiber dispersion was formed, the
aqueous dithizone was filtered through the cellulose ester membrane. Adding ascorbic acid as a reducing
agent during nanofiber preparation step and keeping dithizone membrane in aluminum bag with oxygen
absorber under vacuum would improve the stability of dithizone against oxidation from air and/or light. The
Hg(II)-detection was performed by simply filtering solution through the dithizone membrane and, then,
quantitatively analyzing by the colorimetric equipment. It was found that the concentration range of Hg(II)-
detection can be altered with sample volume. By this technique, the detection limit can be achieved as low as
0.057 ppb with sufficient precision and repeatability. Practically, it could be applied to Hg(II)-determination
in real samples from environment such as artificial waste water, river water and sea water.
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