scholarly journals DETERMINATION OF TOXIC HEAVY METALS IN CHOCOLATE CONFECTIONERY WRAPPERS USED BY SRI LANKAN CHOCOLATE MANUFACTURES AND IT'S MIGRATION TO CHOCOLATES

2015 ◽  
Author(s):  
R.M. Dias
Keyword(s):  
Heavy Metals ◽  
Sri Lankan ◽  
Toxic Heavy Metals

Determination of Traces Heavy Metals from Solid Residues Formed by Combustion of Lignite in Relation to Degree of Accessibility in Soil and Plants

2017 ◽  
Vol 68 (10) ◽  
pp. 2363-2366
Author(s):  
Delia Nica Badea
Keyword(s):  
Heavy Metals ◽  
Power Plant ◽  
Thermal Power ◽  
Reference Value ◽  
Combustion Products ◽  
Toxic Heavy Metals ◽  
Area Of Influence ◽  
Risk Potential

The paper evaluates the presence and content of traces of heavy metals Hg, Pb, Ni, Cd (total forms) from coal and solid combustion products, the degree of transfer and accessibility in the area of influence of a lignite power plant. The content of toxic heavy metals in residues are characterized by RE Meiji [ 1 (Pb and Hg) and REMeij �1 (Ni and Cd) for the filter ash. Pb and Ni content in the soil exceeds normal values, and Pb exceeds and alert value for sensitive soils around the residue deposit (70.20 mg.Kg-1). The degree of accessibility of the metals in plants (TF), reported at the Khan reference value (0.5), indicates a significant bioaccumulation level for the metals: Cd (1.9) and Hg (0.6) inside the deposit; Cd (0.39) at the base of the deposit, Hg (0.8) in the area of the thermal power plant. The trace levels of heavy metals analyzed by GFAAS and CVAAS (Hg), indicates a moderate risk potential for food safety and quality of life in the studied area.

Determination of toxic heavy metals in indigenous medicinal plants used in Rawalpindi and Islamabad cities, Pakistan

2013 ◽  
Vol 148 (1) ◽  
pp. 158-164 ◽  
Author(s):  
Adeel Mahmood ◽  
Sadia Rashid ◽  
Riffat Naseem Malik
Keyword(s):  
Heavy Metals ◽  
Medicinal Plants ◽  
Toxic Heavy Metals

Determination of toxic heavy metals in Echinodermata and Chordata species from South Korea

2014 ◽  
Vol 7 (4) ◽  
pp. 295-301 ◽  
Author(s):  
Ji Yeon Choi ◽  
Girum Habte ◽  
Naeem Khan ◽  
Eun Yeong Nho ◽  
Joon Ho Hong ◽  
...  
Keyword(s):  
Heavy Metals ◽  
South Korea ◽  
Toxic Heavy Metals

scholarly journals Use of Multiwalled Carbon Nanotube Disks for the SPE of Some Heavy Metals as 8-Hydroxquinoline Complexes

2011 ◽  
Vol 94 (4) ◽  
pp. 1297-1303 ◽  
Author(s):  
Mustafa Soylak ◽  
Yunus Emre Unsal
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotube ◽  
Bovine Liver ◽  
Sample Volume ◽  
Multiwalled Carbon Nanotube ◽  
Separation System ◽  
Toxic Heavy Metals ◽  
Multiwalled Carbon ◽  
Humber River

Abstract A multiwalled carbon nanotube disk was used for the SPE of some toxic heavy metals from environmental samples. Metal ions were adsorbed on the disk as 8-hydroxquinoline complexes, then quantitatively desorbed from the disk by using 10 mL 2 M HNO3. The effects of analytical parameters, including pH, sample volume, and flow rates, on the recoveries of Cd(II), Co(II), Ni(II), Pb(II), Fe(III), Cu(II), and Zn(II) were investigated. The influences of some 1A and 2A group elements and some other ions as concomitant ions on the recoveries of analyte ions were also examined. The LODs of the presented preconcentration-separation system for the analyte ions were found to be in the range of 1.0–5.2 µg/L. In order to validate the procedure, SRM 1577B Bovine Liver, IAEA 336 Lichen, and HR-1 Humber river sediment certifed reference materials were analyzed. The proposed method has been applied to the determination of understudy elements in some pharmaceutical samples and natural water samples from different sites in Turkey.

Simple apparatus for trace analysis of toxic heavy metals. Determination of cadmium and lead by manual d. c. polarography

1976 ◽  
Vol 66 (3-4) ◽  
pp. 253-263 ◽  
Author(s):  
Stephen A. K. Hsieh ◽  
Gerda J. K. Wong ◽  
T. S. Ma
Keyword(s):  
Heavy Metals ◽  
Trace Analysis ◽  
Toxic Heavy Metals ◽  
Simple Apparatus ◽  
Cadmium And Lead

Determination of toxic heavy metals in sea water by FAAS after preconcentration with a novel chelating resin

2011 ◽  
Vol 64 (4) ◽  
pp. 803-808 ◽  
Author(s):  
D. Manivannan ◽  
V. M. Biju
Keyword(s):  
Heavy Metals ◽  
Water Samples ◽  
Sea Water ◽  
Metal Chelates ◽  
Chelating Resin ◽  
Toxic Heavy Metals ◽  
Lead And Zinc ◽  
Copper Manganese ◽  
Cobalt Copper

A solid phase extraction procedure was developed for preconcentration of toxic heavy metals such as cadmium, cobalt, copper, manganese, lead and zinc in sea water samples. A microcolumn packed with 6-[(4-hydroxyphenyl)diazenyl]naphthalene-2,3-diol-formaldehyde (HPDN-F) resin acts as a sorbent to retain the analyte ions by forming metal chelates. The retained trace level metal was subsequently eluted with 1 mol/L HCl and the acid eluent was analysed by Flame Atomic Absorption Spectrophotometer (FAAS). The HPDN-F chelating resin and its metal chelates were characterized by spectral and thermal analysis. The chelating property of the HPDN-F resin towards divalent metal ions was studied as a function of pH and preconcentration flow rate. The recoveries of cadmium, cobalt, copper, manganese, lead and zinc under the optimum working conditions were above 95%. The relative standard deviations were <2%. The limits of detection were <0.1 μg/L. The method presented was applied for the determination of cadmium, cobalt, copper, manganese, lead and zinc in sea water samples.

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