Removal of Hg(ii) in aqueous solutions through physical and chemical adsorption principles

This study was based on determining concentration of essential and toxic heavy metal in coconut water available at a local Hazaribagh area in Dhaka, Bangladesh. All essential minerals, if present in the drinking water at high concentration or very low concentration, it has negative actions. In this study, fifteen samples and eight heavy metals were analyzed by Atomic Absorption Spectroscopy (AAS) method which was followed by wet ashing digestion method. The concentration obtained in mg/l were in the range of 0.3 to 1.5, 7.77 to 21.2, 0 to 0.71, 0 to 0.9, 0 to 0.2, 0.9 to 17.3, 0.1 to 0.9, 0 to 0.9 and 0 to 0.7 for Fe, Ni, Cu, Cd, Cr, Zn, Pb and Se respectively. From this data it was concluded that any toxic heavy metals like Cd, Cr, Pb and Ni exceed their toxicity level and some essential nutrients were in low concentration in those samples.

Download Full-text

Isolation and Identification of Heavy Metal Tolerant Bacteria from Tannery Effluents

Bangladesh Journal of Microbiology ◽

10.3329/bjm.v29i1.28430 ◽

2016 ◽

Vol 29 (1) ◽

pp. 23-26

Author(s):

M Iqbal Hossain ◽

M Nural Anwar

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Bacillus Coagulans ◽

Bacillus Firmus ◽

Chemical Parameters ◽

High Concentration ◽

Isolation And Identification ◽

Tannery Effluents ◽

Physical And Chemical ◽

Metal Tolerant Bacteria

The aim and objective of the study was to isolate and characterize heavy metal tolerant microorganisms from tannery effluents. Six effluent samples were collected aseptically and their physical and chemical parameters were determined. A total of 40 bacterial colonies were isolated from these effluent samples. Among them, six bacterial isolates were characterized provisionally as Alcaligenes aquamarinus, Bacillus coagulans, Bacillus firmus, Enterobacter cloacae, Pseudomonas alcaligens and Pseudomonas mendocina based on morphological, cultural and biochemical characteristics. The survibality and tolerance to heavy metals (Cr and Cu) of these isolates were examined. All the isolates were found to grow at high concentration of CuSO4 (95ppm/ml) and varying degrees of chromium (K2Cr2O7). The highest tolerance was shown by Alcaligenes aquamarinus. These heavy metal tolerant organisms could be potential agents for bioremediation of heavy metals polluted environment.Bangladesh J Microbiol, Volume 29, Number 1, June 2012, pp 23-26

Download Full-text

Heavy metal composition of maize and tomato grown on contaminated soils

Open Agriculture ◽

10.1515/opag-2018-0046 ◽

2018 ◽

Vol 3 (1) ◽

pp. 414-426

Author(s):

A.O. Adekiya ◽

A.P. Oloruntoba ◽

S.O. Ojeniyi ◽

B.S. Ewulo

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Contaminated Soils ◽

Heavy Metal Contamination ◽

Mining Area ◽

Atomic Absorption Spectrophotometry ◽

Toxic Heavy Metals ◽

Mining Site ◽

Solanum Lycopersicum L ◽

Sources Of Pollution

Abstract The study investigated the level of heavy metal contamination in plants {maize (Zea mays) and tomato (Solanum lycopersicum L.)} from thirty soil samples of three locations (Epe, Igun and Ijana) in the Ilesha gold mining area, Osun State, Nigeria. Total concentrations of As, Cd, Co, Cr, Cu, Ni, Pb and Zn were determined using atomic absorption spectrophotometry. Spatial variations were observed for all metals across the locations which was adduced to pH and the clay contents of the soils of each location. The results showed that heavy metals are more concentrated in the areas that are closer to the mining site and the concentrations in soil and plants (maize and tomato) decreased with increasing perpendicular distance from the mining site, indicating that the gold mine was the main sources of pollution. The mean concentrations of heavy metals in plants (tomato and maize) samples were considered to be contaminated as As, Cd and Pb respectively ranged from 0.6 - 2.04 mg kg-1, 0.8 - 5.2 mg kg-1, 0.8 - 3.04 mg kg-1 for tomato and respectively 0.60 - 2.00 mg kg-1, 1.50 - 4.60 mg kg-1 and 0.90 - 2.50 mg kg-1 for maize. These levels exceeded the maximum permissible limits set by FAO/WHO for vegetables. In conclusion, monitoring of crops for toxic heavy metals is essential for food safety in Nigeria.

Download Full-text

Metalliferous content of drinking water and sediments in storage tanks of some schools in Erbil city, Iraq

Italian Journal of Food Safety ◽

10.4081/ijfs.2020.8862 ◽

2020 ◽

Vol 9 (3) ◽

Author(s):

Hawraz Sami Khalid ◽

Hoshyar Saadi Ali ◽

Dhary Almashhadany

Keyword(s):

Heavy Metals ◽

Water Quality ◽

Heavy Metal ◽

Drinking Water ◽

Water Samples ◽

World Health ◽

Storage Tanks ◽

Quality Indices ◽

Toxic Heavy Metals ◽

Water Quality Indices

The present study was conducted to evaluate the quality of drinking water in randomly selected schools in Erbil city, Kurdistan Region, Iraq. The water quality indices such as the Heavy metal Pollution Index (HPI) and Heavy metal Evaluation Index (HEI) were applied to characterize water quality. Eighteen schools were incorporated and sampled for their water storage tanks available to students. Water samples and sediment samples from tanks floor were analyzed by Inductively Coupled Plasma Optical Emission Spectrometer for the determination of twenty-two metal elements. In drinking water samples, all detected metals did not exceed the permissible limits of the World Health Organization. The results of this study showed that the average values of HPI and HEI for As, Cd, Cr, Cu, Fe, Pb, Mn, Ni, and Zn were 54.442 and 0.221, respectively. According to data of the water quality indices, the schools drinking water quality are good and suitable for drinking in terms of heavy metals. However, sediments samples contained high concentrations of all elements including the toxic heavy metals (As, Cd, Cr, and Pb). Re-suspension of sediments into water column after refilling storage tanks can pose a serious threat to students drinking water from such vessels. It is therefore recommended that proper storage tanks are provided to the schools accompanied by continuous sanitation and hygiene practice to mitigate the corrosion of tanks to avoid health risks of toxic metal

Download Full-text

Spatial distribution of heavy metals in surface sediments of Kalametiya Lagoon in southern Sri Lanka; insight towards pollution status and socio-economic interactions

10.21203/rs.3.rs-936004/v1 ◽

2021 ◽

Author(s):

Sunanda Kodikara ◽

Hossein Tiemoory ◽

Mangala Chathura De Silva ◽

Pathmasiri Ranasinghe ◽

Sudarshana Somasiri ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Spatial Distribution ◽

Sri Lanka ◽

Suspended Sediments ◽

Potential Effect ◽

Toxic Heavy Metals ◽

Threshold Effect Level ◽

Effect Level ◽

Economic Interactions

Abstract Heavy metal (HM) pollution has become a serious threat to coastal aquatic ecosystems. This study, therefore, aimed at assessing the spatial distribution of selected heavy metals/metalloids including Arsenic (As), Cadmium (Cd), Chromium (Cr), Lead (Pb), and Mercury (Hg) in surface sediment (0–15 cm) samples collected across Kalametiya Lagoon in southern Sri Lanka. Forty-one (41) grid points of the lagoon were sampled and the sediment samples were analyzed for HM content by using ICP-MS. A questionnaire survey was carried out to investigate the possible sources for HM pollution in Kalametiya Lagoon. Water pH and salinity showed significant variation across the lagoon. Overall mean value of pH and salinity were 6.68 ± 0.17 and 2.9 ± 2.2 PSU respectively. The spatial distribution of the heavy metals was not monotonic and showed a highly spatial variation. The kernel density maps of the measured heavy metals demarcated several different areas of the lagoon. The mean contents of As, Cd, Cr, Hg, and Pb were lower than that of threshold effect level (TEL) however, higher for Hg at the North Inlet. Nevertheless, it was still lower than potential effect level (PEL). Socio-economic interactions have dramatically reduced during the past two decades. Industrial sewage, river suspended sediments and agrochemicals such as fertilizers, pesticides were reportedly identified as the possible sources for heavy metal loads. Accumulation of toxic heavy metals can be minimized by detouring the water inflow to the lagoon.

Download Full-text

Heavy Metals Removal from Water by Efficient Adsorbents

Water ◽

10.3390/w13192659 ◽

2021 ◽

Vol 13 (19) ◽

pp. 2659

Author(s):

Muhammad Zaim Anaqi Zaimee ◽

Mohd Sani Sarjadi ◽

Md Lutfor Rahman

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Water Treatment ◽

Adsorption Process ◽

Natural Occurrence ◽

Toxic Heavy Metals ◽

Major Purpose ◽

Treatment Methods ◽

Metals Removal ◽

Harmful Effects

Natural occurrence and anthropogenic practices contribute to the release of pollutants, specifically heavy metals, in water over the years. Therefore, this leads to a demand of proper water treatment to minimize the harmful effects of the toxic heavy metals in water, so that a supply of clean water can be distributed into the environment or household. This review highlights several water treatment methods that can be used in removing heavy metal from water. Among various treatment methods, the adsorption process is considered as one of the highly effective treatments of heavy metals and the functionalization of adsorbents can fully enhance the adsorption process. Therefore, four classes of adsorbent sources are highlighted: polymeric, natural mineral, industrial by-product, and carbon nanomaterial adsorbent. The major purpose of this review is to gather up-to-date information on research and development on various adsorbents in the treatment of heavy metal from water by emphasizing the adsorption capability, effect of pH, isotherm and kinetic model, removal efficiency and the contact of time of every adsorbent.

Download Full-text

Determination of heavy metals and selenium content in chicken liver at Erbil city, Iraq

Italian Journal of Food Safety ◽

10.4081/ijfs.2020.8659 ◽

2020 ◽

Vol 9 (3) ◽

Author(s):

Hoshyar Saadi Ali ◽

Dhary Alewy Almashhadany ◽

Hawraz Sami Khalid

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Inductively Coupled Plasma ◽

Heavy Metal Contamination ◽

Optical Emission ◽

Critical Issue ◽

Chicken Liver ◽

Poultry Meat ◽

Emission Spectrometry ◽

Toxic Heavy Metals

Heavy metal contamination of poultry meat is a critical issue for human health due to associated risks of cytotoxicity and systemic pathologies after ingestion of such metals. A total of twenty chicken liver samples were collected from markets of Erbil city and analyzed for ten heavy metals contents by Inductively Coupled Plasma Optical Emission Spectrometry. The targeted metals were cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), manganese (Mn), nickel (Ni), lead (Pb), mercury (Hg), zinc (Zn) and selenium (Se). The average concentrations (mg/kg) of targeted trace elements were 0.06±0.027, 0.06±0.05, 2.05±0.34, 1.85±0.47, 0.15±0.17, and 33.53±5.24 for Co, Cr, Cu, Mn, Ni, and Zn respectively. Copper (Cu) levels significantly exceeded the maximum permissible limit of WHO. Moreover, the average concentrations of toxic heavy metals and selenium were 0.07±0.037, 0.278±0.10, 0.11±0.083, and 2.01±0.454 mg/kg for Cd, Pb, Hg, and Se respectively. Hg and Pb levels exceeded the permissible limits of WHO. Higher levels of Cu and Hg in poultry may pose a serious threat to consumers which demand countermeasures and precautions to be taken. Iraqi Standards Authority and relevant official institutions are strongly recommended to regulate safe disposal of heavy metal waste in the environment to reduce animal exposure to such metals.

Download Full-text

Probiotic Lactobacillus sp. with bioremediation potential of toxic heavy metals

Bangladesh Journal of Microbiology ◽

10.3329/bjm.v34i1.39605 ◽

2018 ◽

Vol 34 (1) ◽

pp. 43-46 ◽

Cited By ~ 2

Author(s):

Sangita Ahmed ◽

Md Rafiqul Islam ◽

Jannatul Ferdousi ◽

Tabassum Samia Iqbal

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Industrial Development ◽

Biochemical Properties ◽

Low Ph ◽

Drug Resistant ◽

Toxic Heavy Metals ◽

Human Gut ◽

Probiotic Lactobacillus ◽

Lactobacillus Spp

Pollution of the environment and food with toxic heavy metals is being intensified in Bangladesh with industrial development. Consumption of foods and water contaminated with heavy metals imposes threat to human health. Aiming to find a solution to this problem, the present study focuses on probiotic Lactobacillus spp. with potential to remove heavy metals from environment as well as human body. A total of three Lactobacillus spp were isolated from curd samples and were identified based on their morphological and biochemical properties. These isolates were tolerant to low pH and bile salt which aids in their application in human gut. All isolates could tolerate 600 ppm chromium, 400 ppm lead, 400 ppm copper and 400 ppm zinc. The heavy metal tolerant Lactobacillus spp were also multi drug resistant and showed 100% resistance to Azithromycin, Cloxacillin, Gentamicin, Vancomycin, Streptomycin, Nalidixic acid, Trimethoprim-Sulfamethoxazole and Penicillin, while 100% sensitivity was observed to Imipenem. Bangladesh J Microbiol, Volume 34 Number 1 June 2017, pp 43-46

Download Full-text

Batch and column tests for the development of an immobilization technology for toxic heavy metals in contaminated soils of closed mines

Water Science & Technology ◽

10.2166/wst.1998.0311 ◽

1998 ◽

Vol 37 (8) ◽

pp. 81-88 ◽

Cited By ~ 9

Author(s):

A. Jang ◽

Y. S. Choi ◽

In S. Kim

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Contaminated Soils ◽

Mine Drainage ◽

Fine Sand ◽

Design Parameters ◽

Batch Adsorption ◽

Toxic Heavy Metals ◽

Chemical Additives ◽

Column Tests

Laboratory tests of various chemical treatments for the immobilization of copper, nickel, and lead in soils typically found at mine facilities were evaluated. A series of batch, adsorption tests, and lab-scale continuous column tests were conducted to optimize the design parameters for the full-scale immobilization processes. The laboratory test program consisted of batch and column experiments to measure the leachability and subsequent immobilization of the single heavy metal, Cu2+, Pb2+, and Ni2+ in an artificial soil which was composed of bentonite and quartz fine sand. Batch equilibrium methods were used to test the ability of a large number of chemical additives to react with heavy metals in contaminated soil. The two best treatment chemicals (CaO and Na2S) for each soil-metal combination were selected for more detailed columns studies. The column tests were carried out in the acidic pH range. According to the results of the column leaching test, it was found that the degree of heavy metal leaching is highly dependent on pH. An adsorption test was performed under acidic conditions (pH 4) to evaluate bentonite as an additive to treat acid mine drainage (AMD).

Download Full-text

Heavy metal removal from waste waters by phosphonate metal organic frameworks

Pure and Applied Chemistry ◽

10.1515/pac-2017-0307 ◽

2018 ◽

Vol 90 (1) ◽

pp. 35-47 ◽

Cited By ~ 5

Author(s):

Bianca Maranescu ◽

Lavinia Lupa ◽

Aurelia Visa

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Aqueous Solutions ◽

Metal Ions ◽

Phosphonic Acid ◽

Metal Organic Frameworks ◽

Waste Waters ◽

Heavy Metals Removal ◽

Metals Removal ◽

Metal Organic

AbstractThe increase attention in the area of phosphonate metal organic framework is exemplified with a variety of applications and a rich chemistry of these compounds. Water pollution caused by heavy metal ions is a major concern due to their toxicity to many life forms. In order to decrease the heavy metals impact upon the environment various technologies of water treatment such as: chemical sedimentation, ion exchange, redox process are studied. The tendency is to find a versatile and economical method of heavy metals removal from waste waters. Phosphonate metal organic frameworks were obtained by the reaction of Ni(CH3COO)2·4H2O, phosphonic acid (phosphonoacetic (CP), vinyl phosphonic acid (VP) and N,N-bis(phosphonomethyl)glycine (Gly)) in hydrothermal conditions. Coordination polymers synthesized were characterized by FTIR, XRD, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The adsorption processes represent a very good alternative for heavy metals removal due to low costs and ease of operation. In the present paper the adsorption performance of the mentioned materials in the removal process of heavy metals from aqueous solutions, was studied using the batch method. The adsorption conditions were investigated by varying the initial pH, contact time and adsorbate initial concentration for chromium metal ions removal from aqueous solutions. It was found that the adsorption efficiency of the studied materials in the removal process of Cr(VI) ions from aqueous solutions is in the following order: Ni-CP<Ni-Gly≤Ni-VP.

Download Full-text