scholarly journals Heavy metals present in Ficus benjamina leaves in the metropolitan area of Guadalajara, Mexico

2019 ◽  
pp. 1-12
Author(s):  
Laura Peña-García ◽  
Roberto Maciel-Flores ◽  
José Rosas-Elguera ◽  
Celia Robles-Murguía
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Metropolitan Area ◽  
Particle Dispersion ◽  
Market Area ◽  
Ficus Benjamina ◽  
Atomic Absorption Technique ◽  
The City ◽  
Lazaro Cardenas ◽  
Absorption Technique

Goals: General: The collection of dust samples deposited on Ficus benjamina leaves in the Guadalajara metropolitan area (GMA) will allow the identification of heavy metals and their spatial distribution. Specific: Identify the most polluted areas of the city and the elements present by means of particle dispersion schemes (maps) made with the data obtained by the atomic absorption technique. Metodología: For the extraction of heavy metals an acid digestion was performed. The samples were previously homogenized. The determination was made on an atomic absorption spectrophotometer model Varian AA 240 FS, with a monochromator of CZERNY-TURNER design, panel of 4 lamps and inert and adjustable nebulization chamber. The technique used was flame (flame) and calibration curves were used. Contribución: The concentrations of the seven metals analyzed Cu, Zn, Co, Ni, Cd, Pb and Cr were identified, the most abundant being Cu and Pb. The maps allowed to identify that there are some patterns of distribution of the contamination, such was the case of the Cd, Pb and Zn that are distributed very homogeneously on the Lázaro Cárdenas avenue until reaching the supply market area.

Micromethod for Lead Determination in Whole Blood by Atomic Absorption, with Use of the Graphite Furnace

1975 ◽  
Vol 21 (4) ◽  
pp. 558-561 ◽  
Author(s):  
Frank J Fernandez
Keyword(s):  
Atomic Absorption ◽  
Whole Blood ◽  
Interlaboratory Comparison ◽  
Graphite Furnace ◽  
Sample Pretreatment ◽  
Lead In Blood ◽  
Scale Method ◽  
Flame Atomic Absorption ◽  
Atomic Absorption Technique ◽  
Absorption Technique

Abstract I describe a micro-scale method for determining lead in whole blood by utilizing a graphite furnace. Sample pretreatment consists of fivefold dilution with a dilute surfactant. The method is directly calibrated with lead standards prepared in dilute HNO3. To eliminate a small, nonspecific absorption signal from the blood matrix, simultaneous background correction is used. Interlaboratory comparison with a flame atomic absorption technique that requires extraction yielded high correlation (r = 0.98). Within-run precision (coefficient of variation) ranged from 2 to 4%. Lead in blood can be accurately measured in as little as 20 µl of blood, hence the method is suitable for routine laboratory use and for pediatric screening.

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%.

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