Evaluation of the determination of mercury at the trace and ultra-trace levels in the presence of high concentrations of NaCl by flow injection–cold vapour atomic absorption spectrometry using SnCl2 and NaBH4 as reductands

Haase, Oliver; Klare, Mark; Broekaert, J. A. C.; Krengel-Rothensee, K.

doi:10.1039/a800811f

Cited by 40 publications

(19 citation statements)

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“…A series of artificial water samples containing Hg and different amounts of NaCl were analyzed using a calibration with pure aqueous solutions containing Hg only to establish the influence of major seawater, saline and wastewater concomitants on the determination of Hg, similar to what was reported in [13]. In addition, the solutions containing the multielement matrix were also analyzed ( Table 1).…”

Section: Analytical Performance and Applicationmentioning

confidence: 99%

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Evaluation and application of argon and helium microstrip plasma for the determination of mercury by the cold vapor technique and optical emission spectrometry

et al. 2007

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The suitability of a 2.45-GHz atmospheric pressure, low-power microwave microstrip plasma (MSP) operated with Ar and He for the determination of Hg by continuous-flow cold vapor (CV) generation, using SnCl 2 / HCl as the reducing agent, and optical emission spectrometry (OES) using a small CCD spectrometer was studied. The areas of stability for a discharge in the Ar and in the He MSP enclosed in a cylindrical channel in a quartz wafer were investigated. The excitation temperatures as measured for discharge gas atoms (Ar I, He I), and the electron number densities at 35-40 W and 15-400 mL min −1 were found to be at the order of 3,200-5,500 K and 0.8×10 14 -1.6×10 14 cm −3 , respectively. The relative intensity of the Hg I 253.6-nm line and the signal-to-background ratio as a function of the forward power (35-40 W) as well as of the flow rate of the working gas (15-400 mL min −1 ) were evaluated and discussed. For the selected measurement conditions, the Ar MSP was established to have the lower detection limit for Hg (0.6 ng mL −1 ) compared with the He MSP. The linearity range is up to 300 ng mL −1 and the precision is on the order of 1-3%. With the optimized CV Ar MSP-OES method a determination of Hg in spiked domestic and natural waters at concentration levels of 20-100 μg L −1 and an accuracy of 1-4% could be performed. In an NIST domestic sludge standard reference material, Hg (3.64 μg g −1 ) could be determined with a relative standard deviation of 4% and an agreement better than 4%.

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Section: Analytical Performance and Applicationmentioning

confidence: 99%

“…The analyte solutions were acidified with HCl to a concentration of 2% (m/v). The solution of the reducing agent containing 5% (m/v) of SnCl 2 in 2% (m/v) HCl was prepared by dissolving SnCl 2 ·H 2 O in concentrated HCl and dilution with water as described in [13].…”

Section: Reagents and Standard Solutionsmentioning

confidence: 99%

Evaluation and application of argon and helium microstrip plasma for the determination of mercury by the cold vapor technique and optical emission spectrometry

et al. 2007

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“…12,15 Sodium chloride present in the sample matrix was reported to affect the mercury signal using CVAAS. 16 It was well reported that complete decomposition of the organic matter in plant material and others was not observed using a lowpressure closed-vessel microwave digestion system; 6,17 also organic matter present in the sample digest can affect the analytical signals of Hg by CVAAS. 18 The extent of digestion for botanical and CPM samples using closed-vessel microwave digestion was evaluated by analyzing the same sample digest by HPLC.…”

Section: Effect Of Matrix Interferencementioning

confidence: 99%

Determination of Mercury in Chinese-Prepared Medicine Using Closed Vessel Microwave Digestion with Cold-Vapor Atomic Absorption Spectrometry

Ong¹,

Yong²,

Woo³

et al. 2000

ANAL. SCI.

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Mercury is a well-known toxic metal which was found to be 0.005 to 0.5 mg/kg for normal plant materials and 1 to 3 mg/kg in contaminated plants that were known to be toxic. 1,2 The Sale of Drugs Act in Singapore states that the amount of mercury in herbal medicine must not be greater than 0.5 mg/kg. Chineseprepared medicines (CPM) come in the form of tablets (coated and uncoated), concentrated pills, syrup, capsules, soluble granules and others. 3 In many ways, CPM were very similar to plant materials, except that different herbs are added to a single product.Methods using wet acid digestion with cold-vapor atomic absorption spectrometry (CVAAS) for the determination of mercury in food were well reported in official methods. 4,5 However, the pretreatment of samples using wet acid digestion can be rather tedious.Microwave digestion using a closed-vessel based on the coupling of electromagnetic radiation with mineral acid to produce high pressure and temperature allows the reaction less time to complete than by conventional means. 6,7 Other than for speed, closed-vessel microwave digestion also minimizes the loss of any volatile analytes, such as mercury. Methods used for the determination of mercury in crop and food samples using a closed vessel and open focused microwave digestion with CVAAS have been reported. [8][9][10] The total mercury in sediments and biological samples were determined using offline microwave digestion with flow-injection CVAAS. 11,12 The aim of this work was to develop a simple, rapid, sensitive and high sample throughput method for the determination of mercury in botanical and CPM samples. The developed method uses two different types of closed vessels for microwave digestion with sodium tetrahydroborate and hydroxylammonium chloride as a reductant in the final determination by CVAAS. The effect of undecomposed organics after closed-vessel microwave digestion and other possible matrix interferences of the method were investigated. The method was used to develop an in-house reference material for day-to-day quality-control purposes. A simple approach of using a statistical qualitycontrol (SQC) chart was proposed for monitoring the stability of an analytical procedure. ExperimentalReagents & standard reference materials High-purity concentrated nitric acid (BDH, Aristar Grade) was used for acid digestion. Deionized water from a Millipore Alpha-Q system that had the capability to produce 18 mΩ cm was used. One certified plant reference material (olive leaves, A method that is both simple and rapid for the determination of mercury in Chinese-prepared medicine (CPM) was developed. The method uses closed-vessel microwave digestion with final analysis by CVAAS with a sodium borohydride and hydroxylammonium hydrochloride solution. The accuracy of the method was checked using botanicalcertified reference materials (BCR62, olive leaves), and close agreement with certified values was achieved. The precision of the method, based on different types of CPM samples and different analysts on different da...

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“…According to Haase et al . [13], a concentration of NaCl of 3.5% (35 g NaCl L − 1 ) in metal solution should have no effect on the determination of Hg concentration by this method. All the material was acid washed [14] prior to use.…”

Section: Introductionmentioning

confidence: 99%

Effect of salinity and temperature on the adsorption of Hg(II) from aqueous solutions by a Ca‐montmorillonite

Green-Ruíz

2009

Environmental Technology

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To cite this article: C. Green-Ruiz (2009) Use of clay minerals for removing mercury is an effective technology for the treatment of industrial wastewaters and can become an effective tool for the remediation of coastal ecosystems polluted with this metal. Calcic montmorillonite was employed for adsorbing Hg(II) ions from aqueous solutions at different conditions of salinity (0, 20 and 35 g NaCl L − 1 ), temperature (15, 25 and 35 ° C), and initial concentrations (0.25, 0.50, 1.00, 2.50, 5.00 and 10.00 mg Hg L − 1 ). It was observed that 0.4 g dry weight of montmorillonite removed from 0.02 mg g − 1 (at 0.25 mg L − 1 of Hg(II)) to 0.68 mg g − 1 (at 10.0 mg L − 1 of Hg(II)) at 25 ° C, salinity of 0 g NaCl L − 1 and pH of 6. The initial concentration of Hg(II) and salinity had an effect on the behaviour of the adsorption process, which was temperature independent. The data fit well the Freundlich adsorption isotherm, indicating that heterogeneous conditions prevail in this process.

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Evaluation of the determination of mercury at the trace and ultra-trace levels in the presence of high concentrations of NaCl by flow injection–cold vapour atomic absorption spectrometry using SnCl2 and NaBH4 as reductands

Cited by 40 publications

References 4 publications

Evaluation and application of argon and helium microstrip plasma for the determination of mercury by the cold vapor technique and optical emission spectrometry

Evaluation and application of argon and helium microstrip plasma for the determination of mercury by the cold vapor technique and optical emission spectrometry

Determination of Mercury in Chinese-Prepared Medicine Using Closed Vessel Microwave Digestion with Cold-Vapor Atomic Absorption Spectrometry

Effect of salinity and temperature on the adsorption of Hg(II) from aqueous solutions by a Ca‐montmorillonite

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