Automated method for determination of mercury in urine.

1976 ◽  
Vol 22 (10) ◽  
pp. 1604-1607 ◽  
Author(s):  
R A Richardson
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Coefficient Of Variation ◽  
Flameless Atomic Absorption ◽  
Automated Method ◽  
Atomic Absorption Technique ◽  
Mercury In Urine ◽  
The Mean ◽  
Absorption Technique

Abstract I describe a sensitive, specific, automated method for determination of mercury in urine by the "flameless atomic absorption" technique. One can analyze 20 samples per hour, with less than 0.5-ml samples of urine. The detection limit is 0.01 mumol/liter (2mug/liter) and the mean coefficient of variation 12%. The procedure is being used to monitor mercury excretion by workers exposed to mercury.

The Determination of Barium and Antimony in Gunshot Residue by Flameless Atomic Absorption Spectroscopy Using a Tantalum Strip Atomizer

1975 ◽  
Vol 29 (1) ◽  
pp. 44-48 ◽  
Author(s):  
J. A. Goleb ◽  
C. R. Midkiff
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Spectroscopy ◽  
Acid Leaching ◽  
Gunshot Residue ◽  
Relative Deviation ◽  
Flameless Atomic Absorption ◽  
Flameless Atomic Absorption Spectroscopy ◽  
Atomic Absorption Technique ◽  
Absorption Technique

A flameless atomic absorption technique, employing a tantalum strip atomizer, has been developed to determine barium and antimony in gunshot residue. Cotton swabs, wetted with 5% HNO3, are used to collect residue. Barium and antimony are released from the swabs by acid leaching or plasma ashing. Both techniques give good recoveries; the ashing technique is preferred for blood-stained swabs. The sensitivity for barium is 0.1 ng/10 µl and antimony 0.2 ng/10 µl. At nanogram levels the standard relative deviation for barium is 8.3% and for antimony 8.5%.

Determination of Mercury in Low-Grade Ores

1972 ◽  
Vol 26 (2) ◽  
pp. 288-293 ◽  
Author(s):  
H. G. Henry ◽  
K. R. Stever ◽  
W. L. Barry ◽  
H. H. Heady
Keyword(s):  
Atomic Absorption ◽  
Coefficient Of Variation ◽  
Matrix Effects ◽  
Small Sample ◽  
Low Grade ◽  
Ground Sample ◽  
X Ray ◽  
Atomic Absorption Technique ◽  
Absorption Technique

Two new rapid and accurate methods are presented for determining mercury in low-grade ores and tailings: (1) A combustion–atomic absorption technique is described wherein a small sample of finely pulverized ore is heated to about 700°C, and the vaporized Hg is detected by atomic absorption. This method is suitable for determining Hg in the 0.1–5.0 lb/ton range, and the precision is about 5% coefficient of variation; (2) an x-ray fluorescence method is described wherein the unweighed, finely ground sample is merely packed into a holder, and the Hg line-to-background ratio is obtained. The problem of matrix effects is avoided by preparing standards to simulate the type of ore being analyzed. The method is suitable for determining Hg over a wide concentration range, with a lower limit of about 0.1 lb/ton. The precision, based on the analysis of a 2.0 lb/ton Hg ore, is about 5% coefficient of variation. These two techniques are compared to the commonly used Whitton and Bureau of Mines methods.

Dry Ashing, Hydride Generation Atomic Absorption Spectrometric Determination of Arsenic and Selenium in Foods

1982 ◽  
Vol 65 (3) ◽  
pp. 647-650 ◽  
Author(s):  
Gerard K H Tam ◽  
Gladys Lacroix
Keyword(s):  
Detection Limit ◽  
Atomic Absorption ◽  
Reference Materials ◽  
Hydride Generation ◽  
Spectrometric Method ◽  
Flameless Atomic Absorption ◽  
Dry Ashing ◽  
Atomic Absorption Spectrometric ◽  
Certified Values

Abstract A dry ashing, flameless atomic absorption spectrometric method was evaluated to determine arsenic and selenium in foods. Samples were dry-ashed with Mg(N03)2-MgO and dissolved in HC1. Selenate was reduced to selenite by boiling in 4N HC1, and arsenate to arsenite by treatment with KI. Hydrides of arsenic and selenium were generated by the addition of NaBH4 and were swept by nitrogen and hydrogen into a thermally heated silicate tube furnace. The detection limit was about 5 ppb for each element based on a 10 g sample. Analytical results obtained for several samples of NBS reference materials agreed with the certified values. The procedure was evaluated by another laboratory and results were satisfactory.

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