Simplification of the thermal decomposition process of silver amalgam during the determination of total mercury in tissue samples by flameless atomic-absorption

1989 ◽  
Vol 334 (8) ◽  
pp. 740-742 ◽  
Author(s):  
Norio Ichinose ◽  
Yu -ichi Miyazawa
Keyword(s):  
Thermal Decomposition ◽  
Atomic Absorption ◽  
Total Mercury ◽  
Decomposition Process ◽  
Thermal Decomposition Process ◽  
Tissue Samples ◽  
Flameless Atomic Absorption ◽  
Silver Amalgam

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.

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 Mercury in Biological Samples by Flameless Atomic Absorption After Combustion and Mercury-Silver Amalgamation

1972 ◽  
Vol 55 (1) ◽  
pp. 96-100
Author(s):  
Iwao Okuno ◽  
Richard A Wilson ◽  
Robert E White
Keyword(s):  
Atomic Absorption ◽  
Combustion Products ◽  
Atomic Absorption Spectrophotometry ◽  
Silver Wire ◽  
Organic Mercury ◽  
Tissue Samples ◽  
Flameless Atomic Absorption ◽  
Mercury Compounds ◽  
Low Levels

Abstract A method is described that combines combustion with amalgamation of mercury with silver for determining low levels of mercury by flameless atomic absorption spectrophotometry. Samples are burned with oxygen in a combustion flask and the combustion products are dissolved in dilute HCl. Mercury is extracted from solution by amalgamating on a silver wire and then volatilized into an atomic absorption cell by electrically heating the silver wire. An average recovery of 91.4% was obtained from tissue samples spiked with inorganic and organic mercury compounds at levels of 0.01 to 1.0 ppm mercury. The coefficient of variation for duplicate determinations was 14.2%. The method is relatively simple and is applicable to any material that can be burned by the combustion procedure.

Flameless atomic absorption spectrophotometric determination of manganese in rat brain and other tissues.

1978 ◽  
Vol 24 (3) ◽  
pp. 471-474 ◽  
Author(s):  
E Bonilla
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Biological Tissues ◽  
Atomic Absorption Spectrophotometry ◽  
Tissue Samples ◽  
Flameless Atomic Absorption ◽  
Absorption Spectrophotometry ◽  
Standard Additions ◽  
Sodium And Potassium

Abstract I describe a method for determining manganese in biological tissues by flameless atomic absorption spectrophotometry, It is simple to perform and does not require prior extraction with solvents. Small tissue samples are dried for 48 h at 110 degrees C and dissolved in concentrated nitric acid; the clear acid solution is introduced into the furnace and the sequential drying (120 degrees C, 20 s), charring (800 degrees C, 70 s), and atomization (2400 degrees C, 8 s) are automatically performed. The technique of standard additions was used ot overcome matrix effect. The detection limit is 0.86 X 10(-11) g of Mn. The CV is 4.7%. Only sodium and potassium interfere at 500-fold concentrations, and their interferences were overcome by using the Deuterium Arc Background Corrector.

scholarly journals Thermal behavior and decomposition kinetics of rifampicin polymorphs under isothermal and non-isothermal conditions

2010 ◽  
Vol 46 (2) ◽  
pp. 343-351 ◽  
Author(s):  
Ricardo Alves ◽  
Thaís Vitória da Silva Reis ◽  
Luis Carlos Cides da Silva ◽  
Silvia Storpírtis ◽  
Lucildes Pita Mercuri ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Melting Process ◽  
Decomposition Process ◽  
Stable Form ◽  
Thermal Decomposition Process ◽  
Mean Values ◽  
Conversion Level ◽  
Polymorphic Forms ◽  
Crystalline Forms

The thermal behavior of two polymorphic forms of rifampicin was studied by DSC and TG/DTG. The thermoanalytical results clearly showed the differences between the two crystalline forms. Polymorph I was the most thermally stable form, the DSC curve showed no fusion for this species and the thermal decomposition process occurred around 245 ºC. The DSC curve of polymorph II showed two consecutive events, an endothermic event (Tpeak = 193.9 ºC) and one exothermic event (Tpeak = 209.4 ºC), due to a melting process followed by recrystallization, which was attributed to the conversion of form II to form I. Isothermal and non-isothermal thermogravimetric methods were used to determine the kinetic parameters of the thermal decomposition process. For non-isothermal experiments, the activation energy (Ea) was derived from the plot of Log β vs 1/T, yielding values for polymorph form I and II of 154 and 123 kJ mol-1, respectively. In the isothermal experiments, the Ea was obtained from the plot of lnt vs 1/T at a constant conversion level. The mean values found for form I and form II were 137 and 144 kJ mol-1, respectively.

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