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Showing 2 results for Toxic Metals
Determination of Toxic Metals Pollution using Extraction (TCLP) in Six Brands of Vermicompost Produced from Bio-Wastes in Tehran
V Past, Ar Mesdaghinia, M Naderi,
Volume 9, Issue 2 (9-2016)
Abstract

Background and objective: Compost is beneficial for conditioning the structure and nutrient content of soil. Toxic metals are the most important contaminants that can enter the food chain through the compost products and affect human health. The aim of this study was to assess the arsenic, mercury, cadmium, and lead levels in six brands of vermicompost produced from the organic solid wastes in Tehran and to compare the amounts with the international and national standard levels.

Materials and Methods: This was a descriptive - analytical study in which samples of six brands of vermicompost products were randomly selected from the distribution centers in Tehran, and from each brand four samples were prepared (24 samples). Then the samples were extracted using the TCLP (Toxicity Characteristic Leaching Procedure) method and after filtration the metal concentrations were measured by Inductively Coupled Plasma (ICP). All data were analyzed using Excel software.

Results: The means and standard deviations of the toxic metals concentrations (arsenic, mercury, cadmium, and lead) in the collected samples of each brand were reported in terms of mg/kg. The maximum concentrations of these toxic metals were 7.45, 0.15, 0.19, and 79.95 mg/kg, respectively.

Conclusion: The results indicated that the levels of toxic metals in the vermicompost samples derived from the municipal solid waste in Tehran were lower than the permissible limits of the national and international standards.


Contamination levels and human health risk assessment of mercury in some fish species from the Anzali International Wetland, Iran
Hassan Malvandi,
Volume 17, Issue 2 (9-2024)
Abstract
Background and Objective: The presence of toxic mercury in fish has caused global concern, as one of the main ways of humans are exposed to it is through fish consumption. Therefore, the main goal on this research was to determine the concentration of mercury in fish and evaluate the health risk to consumers.
Materials and Methods: Samples of pike, common perch, European perch, common carp and goldfish were collected from Anzali wetland. Mercury concentration was measured using a graphite furnace atomic absorption spectrometer. Differences in mercury concentration among the species and the comparison of mercury concentration with the standards were analyzed using one-way analysis of variance and one sample t-test, respectively.
Results: The average concentrations of mercury for pike, common perch, European perch, common carp and goldfish were 59.59, 67.55, 30.45, 9.84, and 10.44 µg/kg ww, respectively. The results showed significant differences in mercury concentrations among different species. The concentrations of mercury in all samples were below the permissible limits of international standards (300 and 500 µg/kg dw), and the HQ index values were less than 1. Therefore, the results indicated no potential risk to consumer health. Additionally, the consumption of European perch, common carp and goldfish is considered safe for sensitive people (children and pregnant women).
Conclusion: In general, there was no potential concern regarding mercury exposure from consuming the studied fish species.
 

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