Tag Archives: heavy metals

245–260 S. Palisoc, Y.A. Malabuyo, R.C. Pereja and M. Natividad
Determination of heavy metals in root crops using bismuth nanoparticles modified graphene paste electrode
Abstract |

Determination of heavy metals in root crops using bismuth nanoparticles modified graphene paste electrode

S. Palisoc¹², Y.A. Malabuyo¹, R.C. Pereja¹ and M. Natividad¹²*

¹De La Salle University, Condensed Matter Research Laboratory, Physics Department, 2401 Taft Avenue, PH 922 Manila, Philippines
²De La Salle University, Condensed Matter Research Unit, CENSER, 2401 Taft Avenue, PH 922 Manila, Philippines
*Correspondence: michelle.natividad@dlsu.edu.ph

Abstract:

Electrochemical detection of lead (Pb2+) and cadmium (Cd2+) was accomplished via anodic stripping voltammetry (ASV) using bismuth nanoparticle (BiNP) modified graphene paste electrode (GPE). The electrode was fabricated by mixing bismuth nanoparticles, graphene, and mineral oil and the mixture was packed in a Teflon syringe. The best electrode was determined by varying the amount of BiNP while the amount of graphene and mineral oil were kept constant at 0.21 g and 0.80 μL, respectively. The highest peak currents were obtained using 1.5 mg BiNP modified GPE. The ASV parameters, namely accumulation time, deposition time, and accumulation potential, were optimized. The calibration curve, analytical sensitivity, limit of detection (LOD), and limit of quantitation (LOQ) of the optimized electrode were determined. The correlation values for Pb2+ (R2 = 0.9409) and Cd2+ (R2 = 0.9086) in the calibration curves showed a positive linear relationship between the anodic peak current and heavy metal concentration. The LOD for both Pb2+ and Cd2+ is found to be 100 ppb. The application of the modified electrode on real sample analysis was performed using root crops purchased from local supermarkets. According to ASV and AAS analyses, most of the samples contained Cd2+ while only a few contained Pb2+. Other metals, such as Fe2+ and Cu2+, were also detected via ASV.

Key words:

, , , ,




234–244 S. Murtic, J. Jurkovic, E. Basic and E. Hekic
Assessment of wild plants for phytoremediation of heavy metals in soils surrounding the thermal power station
Abstract |
Full text PDF (614 KB)

Assessment of wild plants for phytoremediation of heavy metals in soils surrounding the thermal power station

S. Murtic¹*, J. Jurkovic², E. Basic¹ and E. Hekic¹

¹University of Sarajevo, Faculty of Agriculture, Department of Plant Physiology, Zmaja od Bosne 8, BA71 000, Sarajevo, Bosnia and Herzegovina
²University of Sarajevo, Faculty of Agriculture, Department of Chemistry, Zmaja od Bosne 8, BA71 000, Sarajevo, Bosnia and Herzegovina
*Correspondence: murticsenad@hotmail.com

Abstract:

The present investigation was carried out to evaluate the phytoextraction potential of three main wild plant species: annual nettle (Urtica urens L.), daisy fleabane (Stenactis annua (L.) Ness.) and yarrow (Achillea millefolium L.) that grow spontaneously in heavy metal contaminated areas near the thermal power station in Kakanj, Bosnia and Herzegovina. Analyses of the heavy metal content (Ni, Fe, Cr, Cu, Zn, Cd, Pb, Mn) in soil and plant samples taken from the examined area were performed using atomic absorption spectrophotometry. The results obtained revealed that the examined soils are polluted by Ni and Pb and contain relatively high value of Cr and Fe. Annual nettle, daisy fleabane and yarrow have not shown high efficiency in the absorption and accumulation of heavy metals from polluted soils, and therefore these plants are not be considered as potential phytoremediators of soils on the examined area. Furthermore, the results of the study undoubtedly confirm the fact that the total content of heavy metals in soils is not a sufficient parameter for estimating the toxicity of heavy metals in soils and consequently for their transfer and accumulation in plants.

Key words:

, ,




781-795 P. Felix-Henningsen, T. Urushadze, D. Steffens, B. Kalandadze, E. Narimanidze
Uptake of heavy metals by food crops from highly-polluted Chernozem-like soils in an irrigation district south of Tbilisi, eastern Georgia
Abstract |
Full text PDF (794 KB)

Uptake of heavy metals by food crops from highly-polluted Chernozem-like soils in an irrigation district south of Tbilisi, eastern Georgia

P. Felix-Henningsen¹, T. Urushadze², D. Steffens³, B. Kalandadze², E. Narimanidze⁴

¹Institute of Soil Science and Soil Conservation, Justus Liebig University Giessen,
Heinrich-Buff-Ring 26, D-35392 Giessen, e-mail: Peter.Felix-H@umwelt.unigiessen.de
²Tbilisi State University, Ilia Chavchavadze Ave.3, 0128, Tbilisi, Georgia, e-mail:
t_urushadze@yahoo.com; kalandabeso@gmx.net
³Institute of Plant Nutrition, Justus Liebig University Giessen, Heinrich-Buff-Ring 26,
35392 Giessen, Germany, e-mail: Diedrich.Steffens@ernaehrung.uni-giessen.de
⁴Centre for International Development and Environmental Research, Justus Liebig
University Giessen, Heinrich-Buff-Ring 26, 35392 Giessen, Germany e-mail:
nareli@gmx.net

Abstract:

In the middle and lower reaches of the Mashavera valley in SE Georgia, most of the
irrigated soils under different agricultural land use display a strong enrichment of heavy metals
(HM) that can be traced back to irrigation with water polluted by mining wastes contributed
over a period of several decades. The concentrations of total amounts of Cu, Zn and Cd increase
with intensity of land use and amount of irrigation in the following sequence: arable fields < occasionally submerged meadows < vegetable gardens < wine gardens and orchards with mixed cropping of vegetables. A high proportion of HM belongs to the supply fraction, which displays the (un-)specifically adsorbed HM, dissolvable in ethylenediamine tetra-acetic acid (EDTA). The narrow correlation of this fraction with the mobile and plant-available fraction of HM indicates a high long-term risk potential for the food chain. Due to the recent high adsorption capacity of the soils for HM, only a small amount of HM in the mobile fraction was found with proportions less than 1 % of the total amounts for Cu and Zn, and a maximum of 1.5 % for Cd. On the other hand, initial investigations of cereals and vegetable species indicate a high uptake of Cu, Zn and Cd, which for Cu and Cd causes concentrations in plants exceeding the tolerance thresholds for plants, animals and human beings. A field experiment established the strong uptake of heavy metals by spinach, which was unexpected due to the weakly alkaline pH as well as the high contents of clay and organic matter of the soils. This result indicates the high risk of soil pollution by heavy metals for the food chain and consumers.

Key words:

, , , ,




131–137 B. Kalandadze
Influence of the Ore Mining and Processing Enterprise on soil types in adjoining areas
Abstract |
Full text PDF (122 KB)

Influence of the Ore Mining and Processing Enterprise on soil types in adjoining areas

B. Kalandadze

Javakhishvili Tbilisi State University, Chavchavadze ave. 1, 0128 Tbilisi, Georgia; e-mail: kalandabeso@gmx.net

Abstract:

Anthropogenic influence on surroundings has induced anthropogenic or technogenic biogeochemical anomalies, where sharp a increase in the content of chemical elements has been  established. Due to technogenic contamination, the amount of microelements in soils comes close to the level of macroelements that negatively affect plants, soil qualities and biota.
Appearance of technogenic biogeochemical anomalies depends on such activities as mining and manufacturing, exploitation of mines, metallurgical and chemical industries, which,  through the air and sewage, contaminate soils, the atmosphere, storage pools, the vegetational cover and other components of nature. The extent of technogenic pollution depends on industrial capacities of contaminating enterprises, the time of their exploitation and the working effectiveness of purifying constructions.
Regions considerably contaminated with chemical elements have been found to cover the area within a radius of 10–15 km, whereas in the direction of the dominating winds it has even reached 20–30 km. The zone is referred to as a technologically vastly polluted area where dominating chemical contaminants in  the soil threaten the entire soil biota as well as its agrophysical and agrochemical properties.
Our observations revealed that heavy metals from open-cast mines of the Ore Mining and Processing Enterprise were scattered by the prevailing winds throughout the environment within a radius of 8–12 km, and transferred, via irrigating waters, to agricultural arables dozens of kilometers away.

Key words:

, , , ,