Digestion of Food Samples for Total Mercury Determination

1985 ◽  
Vol 68 (5) ◽  
pp. 891-893
Author(s):  
Hon Way Louie ◽  
Danny Go ◽  
Mara Fedczina ◽  
Kevin Judd ◽  
John Dalins
Keyword(s):  
Detection Limit ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Food Samples ◽  
National Bureau ◽  
Mercury Determination ◽  
Albacore Tuna ◽  
Wide Range

Abstract A method of digestion by using a mixture of hydrochloric, nitric, and sulfuric acids has been developed for the determination of total mercury in a wide range of food samples. Good recoveries of mercury were obtained from NBS (National Bureau of Standards) Albacore Tuna and from food samples spiked with inorganic mercury. A detection limit of 0.01g mercury/g can be obtained.

Mixed Acid Solubilization Procedure for Determination of Total Mercury in Food Samples

1983 ◽  
Vol 66 (6) ◽  
pp. 1421-1423
Author(s):  
Ronald W Marts ◽  
John J Blaha
Keyword(s):  
Total Mercury ◽  
Food Samples ◽  
Carbohydrate Content ◽  
Mixed Acid ◽  
Food Items ◽  
Wide Range

Abstract A mixed acid solubilization procedure has been developed for the determination of total mercury in food samples. This procedure has eliminated the problem of mercury loss from samples that are high in lipid or carbohydrate content. The solubilization is rapid and quantitative and can be used for a wide range of food items.

Total Mercury, Inorganic Mercury and Methyl Mercury Determination in Red Wine

2011 ◽  
Vol 5 (3) ◽  
pp. 505-511 ◽  
Author(s):  
Valderi Luiz Dressler ◽  
Clarissa Marques Moreira Santos ◽  
Fabiane Goldschmidt Antes ◽  
Fabrina Regia Stum Bentlin ◽  
Dirce Pozebon ◽  
...  
Keyword(s):  
Methyl Mercury ◽  
Total Mercury ◽  
Red Wine ◽  
Inorganic Mercury ◽  
Mercury Determination

scholarly journals Proposal for a mercury isolation procedure using cold vapor method in combination with voltammetric determination using a rotating gold electrode

2007 ◽  
Vol 5 (2) ◽  
pp. 479-495 ◽  
Author(s):  
Jaromíra Chýlková ◽  
Renáta Šelešovská-Fadrná ◽  
Jaroslava Machalíková
Keyword(s):  
Detection Limit ◽  
Water Solution ◽  
Sample Volume ◽  
Voltammetric Determination ◽  
Mercury Determination ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Electrochemical Cycling ◽  
Pre Treatment

AbstractThe optimal process of pre-treatment and activation of gold rotating disc electrode (AuRDE) before voltammetric determination of mercury is proposed. This treatment encompasses polishing of the electrode surface, electrochemical cycling, and activation. This procedure both increases determination sensitivity as well as improves determination reproducibility. The detection limit on the working electrode achieved using this approach amounted to 8.26·10−10 mol L−1for direct mercury determination in water solution (applying 200 s running accumulation). The procedure of the quantitative mercury isolation from complicated sample matrix was developed as well. It provides better selectivity and significant increase of sensitivity of mercury determination. In case of mercury isolation from one liter of water the detection limit is 6.23·10−11 mol L−1 (analyzing a greater sample volume the determined concentration could be lower).

Determination of Methyl Mercury in Fish by Flameless Atomic Absorption Spectroscopy and Comparison with an Acid Digestion Method for Total Mercury

1976 ◽  
Vol 59 (1) ◽  
pp. 153-157
Author(s):  
Jurgen L Kacprzak ◽  
Ramon Chvojka
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Flameless Atomic Absorption ◽  
Flameless Atomic Absorption Spectroscopy ◽  
The Difference

Abstract A method for the concurrent determination of methyl mercury and inorganic mercury by flameless atomic absorption spectroscopy (AAS) is described. Fifty-seven samples of juvenile black marlin fish were analyzed for inorganic and methyl mercury, and total mercury was calculated by addition of the 2 values. The sensitivity of the method was estimated to be 0.029 μg for inorganic mercury and 0.033 μg for methyl mercury. The detection limit of the method was about 0.02 μg inorganic mercury or methyl mercury and the error of the method was found not to exceed 10% for samples giving about 10% deflection on the absorbance scale. Samples from the same fish were analyzed by a commonly accepted flameless AAS method for the determination of total mercury. When the results for total mercury from the 2 methods were statistically compared, using a paired t-test, the difference between the results obtained by the 2 methods was found to be insignificant at the 95% confidence level.

Electrocatalysis and Sensitive Determination of Sudan I at Fe3O4/Graphene Modified Glassy Carbon Electrodes

2013 ◽  
Vol 401-403 ◽  
pp. 775-778
Author(s):  
Su Xing Luo ◽  
Yuan Hui Wu ◽  
Hua Gou
Keyword(s):  
Iron Oxide ◽  
Detection Limit ◽  
Electrochemical Method ◽  
Food Samples ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Sudan I ◽  
Anodic Peak Current ◽  
Sensitive Determination

The iron oxide/graphene (Fe3O4/rGO) nanocomposite modified electrode and the electrochemical properties of Sudan I were investigated. It was found the anodic peak current of Sudan I was linear with the concentration of Sudan I from 0.008 μM to 6 μM with a detection limit of 0.0005 μM (S/N=3). The regression equation was: Ipa (μA)=-0.8151-0.9651c (μM), R=0.9934. It was convenient and excellent sensitive electrochemical method for Sudan I determination. This electrochemical method was successfully applied to determine Sudan I in food samples.

Rapid Digestion and Flameless Atomic Absorption Spectroscopy of Mercury in Fish

1976 ◽  
Vol 59 (5) ◽  
pp. 1183-1185
Author(s):  
Leon J Dusci ◽  
Laurence P Hackett
Keyword(s):  
Atomic Absorption ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Atomic Absorption Spectrophotometry ◽  
Flameless Atomic Absorption ◽  
Absorption Spectrophotometry ◽  
Flameless Atomic Absorption Spectroscopy ◽  
Fish Samples ◽  
Mercury In Fish

Abstract A rapid method is described for the determination of total mercury in fish samples. The sample is digested with nitric acid-sulfuric acid-potassium permanganate, and then reduced and aerated for measurement by flameless atomic absorption spectrophotometry. The average recoveries of organic and inorganic mercury added to fish were 93 and 95%, respectively. The uniformity of mercury levels in shark tissue has also been investigated.

Determination of Total Arsenic in Total Diet Samples

1970 ◽  
Vol 53 (6) ◽  
pp. 1176-1178
Author(s):  
Harvey K Hundley ◽  
Joseph C Underwood
Keyword(s):  
Acid Solution ◽  
Magnesium Oxide ◽  
Food Samples ◽  
Magnesium Nitrate ◽  
Total Arsenic ◽  
Wide Range ◽  
Total Diet

Abstract A simple, sensitive, and reproducible procedure has been investigated for the determination of total arsenic in composite food samples. Samples are dry ashed in the presence of magnesium oxide and magnesium nitrate, and arsenic is evolved from an acid solution as its hydride. The arsine is reacted with silver diethyldithiocarbamate to give a red complex that is measured photometrically. The absorbance of this complex is proportional to arsenic over a wide range of concentrations (1–20 μg arsenic). The method presented is sensitive to 0.05 ppm (1 μg/20 g product).

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