Determination of Traces of Mercury in Biological Material by Catalytic Action of Mercuric Ions.  Microelectrolysis of Mercury

Pavlovic, D.; Ašperger, Smiljko

doi:10.1021/ac60149a011

Cited by 12 publications

(3 citation statements)

References 13 publications

(8 reference statements)

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“…Auf einige S ystenie sei kurz eingegangen : Ratalyse durch HgZ+: Quecksilber(I1)-Ionen katalysieren die Reaktion z~ ischen Ferrocyanid, Nitrosobenzen und Wasser Fe(CN),*--t C,H,NO --t Fe(CK),C,H,N03-+ CN- [125,126].…”

Section: Katalytischc Vcrfahrcnunclassified

Stand und Trends der Quecksilberspurenanalytik

Nitschke

Scholz

Henrion

1989

Zeitschrift fuer Chemie

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SuiiiniwyThe main developrtients iir the f'ield oj niercury aizulysis are traced hock f'or the lust decade. A short account of' the history is given. Y e w annlyf ical niethods and preconcentration techniques are regarded iuith speciul reference to spectrophotometry, atomic absorption spectroscopy, neutron activation analysis, voltammutry, chromatography, w i d catalytic nnnlysis. Problenas of sampling and applications to environinentctl antrlyais (ire included.

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Section: Katalytischc Vcrfahrcnunclassified

Stand und Trends der Quecksilberspurenanalytik

Nitschke

Scholz

Henrion

1989

Zeitschrift fuer Chemie

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“…Several methods have been applied to determination of mercury in biological material following sample ashing. These include spectrophotometric determination of mercury as the dithizonate ( I , 2), determination of mercury with a mercury vapor meter ( 3 -3 , and determination of mercury using microelectrolysis (6), atomic absorption (7-9), and neutron activation analysis (10-12). Specific analysis for intact organic mercury compounds in food has also been accomplished by a combination of thinlayer and gas chromatographic methods (13,14).…”

Section: Experimental Vapor Pressure Proceduresmentioning

confidence: 99%

Vapor pressure determination by differential thermal analysis

Kemme¹,

Kreps²

1969

Anal. Chem.

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The ordinate of the frequency distribution is obtained by substitution of Equations 5 and 7 into 4:The beta distribution least squares fit to the cumulative distribution is given in Figure 1. The frequency distribution represented by Equation 10 is given in Figure 2.As a means of checking the procedure used in fitting the density distribution, the average density, 6, is calculated.Only the total volume, V , of the particles must be calculated from the frequency distribution since the total weight, W , was obtained experimentally:It is assumed that an infinitesimal interval change in the volume is given as :The right hand side of Equation 12 may be obtained by equating the right hand sides of Equation 10 and Equation 4. Then the relationship in Equation 7 is used. The final result is writtenThis equation was solved with the aid of the 16 point Gaussian quadrature formula (5,9).To check the values of the shape parameters, p and q, as obtained from least squares fitting of the experimental cumulative density distribution to the cumulative beta distribution, the values of p and q were changed by & 1 %, i 5 %, and =klOx, The average density was recalculated with the new values of p and q. With a change of + 1 % in p and q the calculated density remained unchanged. All calculations were performed on an IBM S/360, Model 44 computer. Double precision (16 significant figures) was used and was necessary for the evaluation of the beta function, the least squares procedure, and the evaluation of the integral in Equation 13. The pertinent data for two independent determinations on the same lot of glass beads are given in Table 111.From the results summarized in Table 111, it is clear that the least squares cumulative and frequency distributions, when used to calculate a mean density of the glass beads, give results in good agreement with the pycnometer results. The error in the calculated mean densities is comparable to that expected when densities are determined by Equation 1. Also, examination of Figure 1 indicates rather good agreement between the calculated and experimental distributions.Comparison of the results for the two independent determinations indicates good agreement between these two sets of measurements.

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“…THE RECENT WIDESPREAD concern about relatively high levels of mercury in fish and other species has been publicized (1-5). Methods of analysis for total mercury in biological materials have included colorimetric (6-lo), neutron activation (11,12), flameless atomic absorption (13-15), mercury vapor meter absorption (16)(17)(18)(19)(20)(21)(22)(23), isotope dilution (24) and microelectrolysis (25). The analysis of certain intact organic mercury fungi- cides has been accomplished by colorimetric analysis (26)(27)(28).…”

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confidence: 99%