Sensitive determination of trace mercury by UV–visible diffuse reflectance spectroscopy after complexation and membrane filtration-enrichment

Yin, Changhai; Iqbal, Jibran; Hu, Huilian; Liu, Bingxiang; Zhang, Lei; Zhu, Bin; Du, Yukou

doi:10.1016/j.jhazmat.2012.07.016

Cited by 30 publications

(7 citation statements)

References 45 publications

(42 reference statements)

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“…The Hg 2+ -DTZ complex, with a Hg 2+ : DTZ ratio of 1 : 2, was formed through the binding sites of DTZ at nitrogen or sulfur atoms. [44][45][46] Apparently, two DTZ atoms are required to form a complexation reaction with Hg 2+ ions:…”

Section: Resultsmentioning

confidence: 99%

Detection of mercury ions in water using a membrane-based colorimetric sensor

2018

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Section: Resultsmentioning

confidence: 99%

Detection of mercury ions in water using a membrane-based colorimetric sensor

2018

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“…After that, they were dried in the drying oven for tests. In the end, we obtained the silicon wafers surface reflectivity data by using UV-2600 spectrophotometer (Shimadzu Inc, Japan) equipped with an integrating sphere [11]. In addition, the surface images of monocrystalline silicon wafers were measured by Zeiss EVO MA10 (Carl-Zeiss, Germany) scanning electron microscopy (SEM) [12].…”

Section: Methodsmentioning

confidence: 99%

Study on Surface Texturization of Monocrystalline Silicon Wafers with Na2CO3 and NaHCO3 Solutions

Ma¹,

Man²

2016

Proceedings of the 6th International Conference on Electronic, Mechanical, Information and Management Society

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The surface texturization of monocrystalline silicon wafers based on a mixture of sodium carbonate (Na 2 CO 3) and sodium bicarbonate (NaHCO 3) solutions under different conditions have been studied in this work. A series of comparative experiments were made to indicate the dependence of hemispherical surface reflectivity on the Na 2 CO 3 concentration, the NaHCO 3 concentration and the solution temperature. The results showed that the Na 2 CO 3 concentration and the solution temperature have great effects on texture. In addition, the pyramid size and the surface average reflectivity decreased with the addition of NaHCO 3. On the basis of our experiments, it is shown that the optimized conditions are 24 wt% Na 2 CO 3 , 4 wt% NaHCO 3 , 90 °C and 30 min. Under these conditions, uniform pyramids are fabricated and the textured silicon surface exhibits a lower average reflectivity (about 12.34%) in the main range of solar spectrum (400 nm-800 nm). Because this texturization method is economical, nonhazardous and has low pollution, so we feel that it is an attractive alternative for the industrial production.

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“…Solid‐phase extraction spectroscopy (SPES) has been recently developed by our group, and is a technique to measure spectra directly on solid‐phase materials on which the analytes have been concentrated by the SPE process. This technique has been applied to membrane solid‐phase extraction and UV–visible diffuse reflectance spectroscopy measurements that show at least the following advantages: (i) they are less time consuming and there is less organic reagent consumption because of the lack of need for elution; and (ii) they have a higher sensitivity than traditional SPE because the concentrated analytes are measured in situ and not in solution, from which the analytes must be eluted.…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of benzo[a]pyrene by membrane enrichment coupled with solid‐phase constant‐wavelength synchronous fluorescence spectrometry

Wang

Zhang

et al. 2016

Luminescence

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Normal methods for benzo[a]pyrene (BaP) determination, including gas chromatography-mass spectrometry and liquid chromatography with fluorescence detection, involve expensive instruments and complex separation and purification processes. Based on membrane enrichment, coupled with solid-phase constant-wavelength synchronous fluorescence spectrometry, a simple, fast, sensitive method was proposed for the determination of BaP in water samples. A Nylon membrane was used as the solid-phase extraction material for enrichment. After enrichment, a constant-wavelength synchronous fluorescence spectrum was scanned directly on the membrane-concentrated BaP without elution. Spectral measurement and enrichment conditions were optimized. Under optimum conditions, when using 150 mL sample solutions, the relationship between fluorescence intensity and BaP concentrations in the 0.05-10.00 μg L(-1) range could be fitted by binomial function with an R(2) value of 0.9973. Limit of detection (LOD) was calculated to be 0.0137 μg L(-1) . The volume of the sample solution was increased to 1000 mL to test if the method could be applied to determine lower BaP concentrations. A linear relationship still existed in the range 2.0-20.0 ng L(-1) BaP with an R(2) value of 0.9895, and a LOD of 2.4 ng L(-1) . The method was also used to measure the BaP concentration in several natural water samples, and recoveries were in the 90-110% range with relative standard deviations (RSDs) in the 0.58-7.93% range. Copyright © 2016 John Wiley & Sons, Ltd.

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Sensitive determination of trace mercury by UV–visible diffuse reflectance spectroscopy after complexation and membrane filtration-enrichment

Cited by 30 publications

References 45 publications

Detection of mercury ions in water using a membrane-based colorimetric sensor

Detection of mercury ions in water using a membrane-based colorimetric sensor

Study on Surface Texturization of Monocrystalline Silicon Wafers with Na2CO3 and NaHCO3 Solutions

Rapid determination of benzo[a]pyrene by membrane enrichment coupled with solid‐phase constant‐wavelength synchronous fluorescence spectrometry

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