Determination of mercury by using a gold trap in samples containing considerable sulfide minerals

Leong, P. C.; Ong, H.

doi:10.1021/ac60302a038

Cited by 21 publications

(4 citation statements)

References 2 publications

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“…[18][19][20][21][22] Not surprisingly, attempts have been made towards correlating easily detectable signatures with a degree of gold amalgamation as a means of mercury detection. 23,24 Recently, the spectroscopic signature of nanogold in the visible and near infrared (NIR) region of the electromagnetic spectrum has gained attention for mercury detection resulting in a simple, cost effective, and quick technique. 25 Kim et al…”

Section: Introductionmentioning

confidence: 99%

Ultra-low level optical detection of mercuric ions using biogenic gold nanotriangles

Singh

Pasricha

Sastry

2012

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Mercury is a serious environmental pollutant known to have detrimental health effects in all life forms. Here, we report the use of biologically synthesized aqueous gold nanotriangles for sensitive and selective optical detection of femto-molar levels of mercury ions by exploiting the high amalgamation tendency of mercury metal towards gold. Aqueous chloroaurate ions were reduced using lemongrass (Cymbopogon flexuosus) leaf extract at room temperature to form gold nanotriangles. Mercuric (Hg(2+)) ions were reduced in the presence of these triangles to facilitate amalgamation and the optical properties were monitored. We observe a significant change in the longitudinal plasmon absorption band of the nanotriangles even at femto-molar concentrations of mercuric ions. High-resolution transmission electron microscopy confirms changes in particle morphology at such low concentrations. This protocol shows no sensitivity to other environmentally relevant metal ions, including Pb(2+), Zn(2+), Cd(2+), Fe(2+), Ni(2+), Sr(2+), Ca(2+), Mn(2+), and Cu(2+), confirming further that change in the optical properties of gold nanotriangles in the presence of reduced mercuric ions is solely due to the strong amalgamation tendency of mercury metal.

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Section: Introductionmentioning

confidence: 99%

Ultra-low level optical detection of mercuric ions using biogenic gold nanotriangles

Singh

Pasricha

Sastry

2012

Analyst

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“…Several investigators have liberated mercury from soil and sediment samples by application of heat to the samples and collection of the released mercury on gold surfaces. The mercury was then released from the gold by application of heat or by absorption in a solution containing oxidizing agents (2,3).…”

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confidence: 99%

“…Reagent recirculation in closed flow-through systems has been shown to be a useful ancillary device in repetitive determinations by sample injection (1)(2)(3). Enzymes, because of their catalytic nature, suggest themselves as main reagents to be recirculated in the implementation of such procedures.…”

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confidence: 99%