Top Research Papers on Heavy Metals in Water

Azolla pinnata aquatic fronds were tested for their ability to bioaccumulate heavy metals from Yoshida medium supplemented with different heavy metals, i.e. Pb, Cd and Cu at different concentrations 0.0, 0.5, 1.0, 1.5 and 2.0 ppm, at different growth periods of 5, 10, 15, 20, 25 and 30 days. Results revealed that azolla can grow healthy with the accumulation of these metals. The highest fresh and dry weights of azolla were observed after 30 days at 2.0 ppm of Cu. These values were significantly higher than those for Pb and Cd at 1.0 and 0.5 ppm , respectively. Also, azolla fronds exerted highe...

In the late 1980s oceanographers were puzzled by the Southern Ocean because satellite images attuned to chlorophyll wavelengths showed very low levels of chlorophyll, despite samples of the water being rich in nutrients like nitrate, phosphate and silicate, conventionally regarded as the factors limiting plankton growth. Unable to explain why the phytoplankton were not growing to use the available nutrients, a safe response was simply to name the phenomenon: such waters were termed High-Nitrate, LowChlorophyll (HNLC).

The objective of this study was to determine the bioaccumulation of heavy metals (HM) (Cu, Zn, Hg, Pb and Cd) in 15 tissues (brain, breast muscle, sternum, thigh muscle, femur, blood, heart, lung, gizzard, liver, intestine, spleen, pancreas, bile and kidney) of domestic ducks exposed to HM-contaminated water with levels equal to values specified in the column B of QCVN 40:2011/BTNMT. The experiment was a completely randomized design with two treatments: without exposure to HM (CT) and with exposure to HM (ET). Each treatment was replicated 3 times. Ducks were randomly allocated to the treatmen...

Four heavy metals (Copper, Cadmium, Lead and Zinc) are monitored in drinking water at twelve important residential areas using DPASV Technique. The results indicate the water to free of heavy metal pollution. The data monitored have been used to compute Heavy metal pollution index (HPI) using weighted arithmetic mean method and the proposed Pollution Index (HPI) seems to be applicable in the assesement of overall water quality with respect to heavy metal pollution.

Marine pollution, including heavy metals, is prevalent in Indonesian waters. Previous studies have found evidence of Pb, Cd, Hg, Al and Fe metal contamination in sediments and green mussels. This study used survey research. Heavy metal pollution is increasingly accumulating so that if it is not controlled it is feared that it will have an impact on public health, especially people who live around the coast. The research method was conducted using survey techniques. This study aims to estimate the burden of heavy metal pollution in the ocean. The research was conducted in 5 (five) areas of Indo...

The tolerable daily intake, have to be the basis to assure the prevention of diseases associated with a long-term ingestion of these elements through foods, and review the regulatory limits established in ten countries of America.

Soil and water contamination by heavy metals has a major adverse environmental impact. Concern has long existed over the threat of contamination of soil and water resources by heavy metals but has heightened in recent years as more knowledge has been gained about the negative and potentially serious affects that chronic exposure to heavy metals may have on the health of humans and other living organisms. Long-term exposure to lead affects human cognition; cadmium affects kidney, liver, and gastrointestinal tract functioning; and arsenic affects the skin, kidneys, and central nervous system. Th...

Biosensors are nowadays a powerful alternative to conventional analytical techniques for controlling the quality of not only natural water but also process water used by the food industry during the production process, as well as wastewater prior to release into natural watercourses. The goal is to provide the required quality and safety of water from the standpoint of heavy metal contamination. The basic and most important characteristics of biosensors are high sensitivity, short response time, specificity, and relatively low production cost. Biosensors can detect the presence and measure the...

Biosensors are nowadays a powerful alternative to conventional analytical techniques for controlling the quality of not only natural water but also process water used by the food industry during the production process, as well as wastewater prior to release into natural watercourses. The goal is to provide the required quality and safety of water from the standpoint of heavy metal contamination. The basic and most important characteristics of biosensors are high sensitivity, short response time, specificity, and relatively low production cost. Biosensors can detect the presence and measure the...

The present invention is substituted with magnesium ions than 10 mole% of the total cation exchange capacity, more than 60 mole% is a synthetic zeolite and activated carbon substituted by magnesium ion and calcium ion: water containing in a weight ratio of 50: 98-50 It relates to the removal of heavy metals. With such a water heavy metal scavenger can be highly adsorb and remove heavy metal ions of lead and the like in water, especially water, and to the residual chlorine, trihalomethyl methane also can be efficiently removed, it hurts more balance of calcium ions and magnesium ions in but, de...

Distribution of copper, chromium, lead, and zinc in the water, sediments, and chironomids was studied at five stations in Skeleton Creek, Oklahoma, a stream receiving oil refinery and municipal wastewater effluents, February through October 1973. Copper, chromium, and zinc concentrations in the water were higher in winter than in summer, and highest concentrations generally occurred just below the outfall. Metals in sediments were generally higher in summer than in winter and highest concentrations occurred farther downstream. Warm water temperature and the concomitant increased microbial acti...

The heavy metal content of river water samples with 12 and 15 mg/l dry matter of seston is increased to 400 … 3900μg/l by the addition of inorganic heavy metal salts, and after three days the distribution of the heavy metals is determined by fractional filtration (8, 3, 1.2, 0.8, 0.65, 0.45 and 0.22 μm pore size). More than 80% of Ni, Co and Mn are found in the fraction 8 μm as well as 40 and 25%, resp., in 8 μm. The influence of specific parameters of water quality as pH-value and seston concentration on the distribution requires further investigations.

In this experiment,manganese,chromium,mercury were examinated by the visible spectrophotometry,which according to GB5750-1985,copper,zinc,plumbum and cadmium were examinated by the flame atomic absorption spectrophotometry,which according to GB/T 8538-1995.

Heavy metal pollution has become one of the most serious environmental problems globally. The removal of heavy metals from the environment is of special concern due to their persistence in the environment. Yet conventional techniques for removing these metals are very expensive and impractical for use in many parts of the developing world. Researchers therefore continue to explore cheaper, but effective techniques. The research presented in this book explores the use of raw coconut shell powder in removing heavy metals via biofiltration, and compares its effectiveness to that of activated coco...

Atomic absorption spectrophotometry was used to determine the heavy metal content of tap water,well water and river water from one town.The results show that the contents of Cr,Cd and Pb are in line with national standards.These results provide an experimental evidence for the water quality and safety.

Water quality is one of the most important concerns. This study focused on screening of the most dangerous heavy metals(cadmium, chromium, copper, lead and nickel)in fresh water sources (surface and groundwater) of study area, Sohag governorate, Egypt. Ninety samples were collected from 15 sites along the study area extending from Tima to Dar-Elsalam cities; 12 wells and 3 Nile river local sites, 6 samples for each site, three during winter and three during summer. Results indicated that, total dissolved solids (TDS) and electric conductivity(EC) parameters in all samples increased significant...

In the present paper we show results of our research on the contents of selected heavy metals in the surface and subsurface water layers of the estuarine lake Gardno. Obtained results show that there are substan- tial differences between concentrations of lead, copper and zinc in surface microlayer and subsurface waters. We observed that the surface microlayer is capable of accumulating much higher amounts of these metals than the subsurface waters. Analysis of seasonal changes in heavy metal concentrations in surface microlayers and subsurface waters shows some periodicity of these changes.

Metal are present in environment parts in low concentration. The presences of heavy metals pollution in water has negative impacts not only aquatic ecosystems but also represent serious problems for human health. Metal contamination in water is a major component in the determination of water quality. The object is this study was the analysis and identification of heavy metals in tap water at the Tirana city. During this survey we were collected samples at different points of the water supply, from sources of water, storage of water and in the consumer from different locations in Tirana city. T...

Biosensors are nowadays a powerful alternative to conventional analytical techniques for controlling the quality of not only natural water but also process water used by the food industry during the production process, as well as wastewater prior to release into natural watercourses. The goal is to provide the required quality and safety of water from the standpoint of heavy metal contamination. The basic and most important characteristics of biosensors are high sensitivity, short response time, specificity, and relatively low production cost. Biosensors can detect the presence and measure the...

The determination method of heavy metals Mn,Ni,Cu,Zn,Pb in water by desktop polarization EDXRF was established.By the verification test of standard samples,it showed the method was accurate,and the standard deviations were low.This method can be used for the test of heavy metals in water,and multi-elements can be simultaneous analyzed.It was characterized by small error and steady.

Surface and Ground Water pollution has been growing increasingly in several parts of India and other countries, particularly in areas of intensive industrialization. Many industries discharge their untreated or partially treated waste in the immediate neighbourhood or in some nearby low-lying areas most oftenly in channels which join various surface water bodies such as large ponds, streams, rivers etc. The pollutant of these waste materials seep down to the ground water systems along with the entire course of fluid flow and pollute ground water. Crops grown with polluted water absorb consider...

Microorganisms have the potential to remove heavy metals from polluted waters and effluents and may be used in clean-up processes. Microbial associations were enriched for and adapted to grow in nutrient solutions containing various concentrations of different metals. As immobilised cells are known to be more stable and more efficient in metal uptake than are corresponding planktonic or free-living cells the attachment of the microbial associations was investigated using a model stream and it was found that biofilm development was better on rough surfaces such as ground glass and polystyrene t...

This review has been written with the hope that it would be beneficial as a source of information for researchers and other common people regarding heavy metals and their adverse effects on health.

Heavy metal treatment in water by biosorption is summarized,which show that biosorption of heavy metal is fine.Mechanism of biosorption is complex,and it has intimate relation to ion-change.Biosorption capacity of heavy metal was evaluated by isotherm.As the history of investigation is short,the study of application,mechanism and granulation on biosorption is inadequate,and farther investigation is necessary,which will make biosorption industry application.

The primary focus of the study is to assess the presence and concentration of heavy metals in the water and evaluate its suitability for drinking purposes. Given that a significant portion of the local population depends on groundwater for their daily needs, the study is critical in understanding the potential health risks associated with consuming contaminated water. The study begins with a comprehensive survey to gauge the extent of water usage among the local population and their perceptions of water quality. Results from the survey reveal that nearly half of the households in the region ar...

The invention discloses a method for online recovering heavy metal resource from heavy metal waste water. The method comprises the following steps: only adding sodium hydroxide in electroplated heavy metal waste water, and adjusting pH value of waste water without adding polymer organic flocculant such as PAC (polymeric aluminium chloride) and PAM (polyacrylamide), so that the heavy metal forms precipitate, the aim of primarily separating the heavy metal from waste water is achieved, and the secondary pollution is avoided, the cross flow filtration technology and reverse osmosis technology whi...

Heavy metals are metal ions which acts as carcinogens and causes serious health issues as they produce free radicals and these free radicals cause damage to DNA which eventually leads to cancer. They are non-degradable in nature and responsible for contamination of various natural resources in environment mainly water contamination has become a major problem. Many metal ions such as cadmium, lead, arsenic, mercury are considered as toxic metals. The analysis of these metal ions is necessary and to detect these metal ions, several detection methods such as electrochemical biosensors, CNT’s, sil...

The status of water pollution by heavy metal and the harm of heavy metal are depicted.The determination methods of heavy metal in the fresh water are demonstrated in detail involving in atomic absorption spectrometry(AAS) and atomic fluorescence spectrometry(AFS) and inductively coupled plasma(ICP) stripping voltammetry(SV) and laser induced breakdown spectroscopy(LIBS).The new analytical methods of enzyme inhibition and immunoassay and biosensor are summarized.

Water pollution is a foremost problem across the world that endangers the survival and development of man and society. As a result of this menace, the effective and efficient removal of heavy metal ions from water has become a serious concern. Metal– organic frameworks (MOFs) have gained attention as promising materials for liquid-phase adsorptive removal of heavy metal ions. Properties such as large surface area, high adsorption capacity, tunable porosity, hierarchical structure and recyclability give MOFs an edge over conventional adsorbents. In this article, recent advances in the removal o...

Clean and safe drinking water is one of the most important and essential components on earth for human survival. However, due to the various anthropogenic activities, the surface and groundwater have been contaminated with heavy metals and radionuclides, and it has become a serious problem of concern globally. These non-biodegradable heavy metal ions from water tends to accumulate in the soil and living organisms and causes serious health hazards in humans. Thus, the finding of recyclable, water-stable MOFs, and multi-functional MOFs (hybrid MOFs) with superior adsorption capability have emerg...

KMS-1 overcomes the limitations of the known heavy metal ion sorbents, showing the capability to rapidly reduce the concentrations of Cd, Hg, and Pb ions well-below the legally acceptable levels for drinking water.

The analysis index of the portable metal analyzer for analyzing trace heavy metals,Cu2+,Pb2+,Cd2+ and Zn2+ in water based on anodic stripping voltammetry(ASV) were measured in this article.The reasons of disturbance between Cd2+ and Zn2+ in analysis were discussed,and subsequently the way how to eliminate was also studied here.

The water stream in Desa Kejapanan, Pasuruan, East Java, Indonesia used as a source of water for households and field irrigation is indicated to experience heavy metal contamination. The purpose of this study is to determine the type and concentration of metals in the water stream that is contaminated with metal washing waste. The concentration of heavy metals in water and sediments was tested using the Atomic Absorption Spectrophotometer (AAS) method. In this case, the physical and chemical components of the water measured were color, temperature, pH and DO. Meanwhile, the data of heavy metal...

ホテイアオイを用いた汚濁水からの鉛, カドミウム, 銅の除去の可能性を検討した。初めに1ppmの鉛を混入した水耕液でホテイアオイを栽培し, 鉛のホテイアオイ体内における分布を調査した結果, 根においては栽培開始後1週目に鉛の含量は最高値に達し, その後の増減には一定の傾向は認められなかった。根に取り込まれた鉛の浮木部, 葉部への移動は少ないものと考えられ, これらの器官での鉛の含量は根部のそれよりはるかに低い値であった。次に, 各10ppmの鉛, カドミウム, および銅の水溶液, またはその混合溶液中からのホテイアオイへの収着量を比較した結果, 鉛が最も良く収着され, 次いで銅, カドミウムの順であった。これらの重金属の収着は他の重金属によって妨害され, また, 強酸性液の場合, 液温の低い場合も収着量が少ないことがわかった。

Natural nonmetallic minerals are widely used to treat heavy metal polluted waste water because of its better absorption,ion exchange capacity and chemical activity.The application of nonmetallic mineral materials to heavy metal waster water treatment is summarized and the application prospect is predicted.

Nanotechnology finds its application almost in every field of science and technology. At the same time, it also helps to find the solution to various environment-related problems, especially water contamination. Nanomaterials have many advantages over conventional materials, such as high surface area, both polar and non-polar chemistries, controlled and size-tunable, easier biodegradation, which made them ideal candidates for water and environmental remediation as well. Herein, applications of non-carbon nanomaterials, such as layered double hydroxides, iron oxide magnetite nanoparticles, nano...

The review shows that the electrochemical detection of heavy metal ions is a very promising strategy that has attracted widespread attention and can be applied in agriculture, life science, clinical diagnosis, and analysis.

Heavy metal pollution is a problem associated with areas of intensive industry, road ways, areas of dumpsites and automobiles. Usage and their un controlled discharge in to the environment has caused last of hazards to man, other organisms and the environment itself. Over last three decades there has been increasing global Concern over the public health impacts attributed to environmental pollution, in particular, the global burden of disease. Improper management of solid waste is one of the main causes of environmental pollution and degradation in many cities , especially in developing countr...

ABSTRACTThe study of Pb, Cd, Cu, Hg, and As and Fe in Natuna coastal waters, Riau Islands was conducted in November 2012. Water and sediment samples were collected from 35 stations by purposive sampling method and those heavy metals were analysed using Atomic Absorption Spectrophotometer, flame type (FAAS). The results showed that concentrations of total Pb, Cd, Cu, Hg, and As in surface water were below instrument detection limit (2 µg/L for Pb, Cd, and Cu; 0.02 µg/L for Hg and As). Moreover, the concentration of metal Fe in surface water was 0.021-0.054 mg/L. Concentrations of Pb and Cu in s...

The paper presents the results and conclusions from the investigations carried out on the water contamination with heavy metals in the River Zletovska and its vicinity. The examinations are an attempt to determine the real and the physical state of heavy metals in the river water and its tributaries. Seventeen samples were collected from the Zletovska and several smaller rivers in the surrounding. Samples were analyzes with AES - ICP method. Earlier experiences indicated that the following elements should be expected: Mn, Fe, Zn, As, Cd, Cu, Ni, Co, Ag, Ti with possible occuarrence of increase...

Istraživanje teskih metala Cd, Pb i Zn, u hidromelioriranom tlu i drenažnoj vodi, provedeno je na melioracijskom pokusnom polju “Jelenscak” Kutina, na hidromelioriranom pseudoglej-glejnom tlu u razdoblju od 2007.-2009. Srednje vrijednosti koncentracije metala u tlu (0, 2 mg/kg Cd ; 18, 1 mg/kg Pb i 74, 2 mg/kg Zn) i drenažnoj vodi (3, 2 μg/L Cd ; 3, 8 μg/L Pb i 25, 0 μg/L Zn) bile su ispod MDK (maksimalno dopustenih koncentracija). Promatrano hidromeliorirano tlo i drenažne vode, uz postojeci oblik gospodarenja, nisu optereceni ispitivanim teskim metalima.

There were no risk of nickel,hydrargyrum,lead for adults at this exposure of heavy metals in drinking water, and exposures of chromium,arsenic,zinc,ferrum, hydrargyrums were not acceptable for a small proportion of adults.

A chelation method was used to separate labile metal fractions in marine water. A chelating resin (Metalfix(R) Chelamine(R)) with immobilized tetraethylenepentamine was used to chelate the divalent metals of Cu., Pb, Zn, Cd, Co and Ni in the water samples. The extracted heavy metals were eluted with 2M HNO3, deionized water, 0.12M NH3 . H2O and deionized water sequentially. The recovery rates of the method for the spiked bivalent metal ions were 96-103% for Zn, 85-91% for Pb, 79-91% for Cd and 93-102% for Ni respectively. The chelation method was used to study the labile heavy metal concentrat...

The result revealed that the heavy metal pollutions reduced the microbial diversity in the studied waters, are ecotoxic as well as that some of newly isolated bacteria possess a capacity for a clean-up biotechnologies in the region.

Heavy metals are a major concern in the treatment of water due to the toxic and other harmful effects these materials can produce. The objective of this study was to determine the heavy metals contains in Gambang Lake water. The water samples were colleated from five sampling points around the lake. Samples were analysed using Atomic Absorption Spectroscopy (AAS) at which this instrument is possible to determine about 70 elements (mainly metal) at very low concentration. The metals analysis was done to detect lead, ferum, copper and magnesium. Based on the result, ferum recorded as the highes...

يم تانيع عمج مت رةصبلا ةةظفاحم يف ةفلتخم قطانم نم برشلل ةحلاصلا هايملا تادا ربو تانا زخو ةيضوح تا رايس نم ها نةةةم رةةتفلل 1 / 11 / 8112 ةةةةياغلو 1 / 4 / 8112 اةةةصرلا ةةةةلي لا رةةةصان،لا زةةةيةرت دةةيدحت لرةةةغل ةةةلتو ةةةةيربتخملا ةةةسا ردلل عةةةضختل تة يةف ة ينلا و قةبلزلا باةحنلا ةنزلا تةلابوةلا مويمداة لا تاةنا زخلاو ةيةضوحلا تا رايةسلا نةم ة ري مةت ردةم ةةفر،مو هاةيملا ه زةةيةرتلا عةةم لاةةتنلا ةةةنرا م تةةمتو لاةةتنلا مةةلع وةةصحلل ئرتةةلا اةةصتملا ةةةين ت تمدختةةسا اةةخيف دوةةجوملا هاةةيملا مةةلع تادا رةةبلاو ا برشلل ةحلاصلا هايملا نأ جاتنتسا مت ةيملا،لا ةحصلا ةمظنم بق نم ددحملا مل...

Heavy metal pollution presents a serious problem for human health and ecosystems. During this survey we were collected a total number of 16 surface water samples. The analyses of four heavy metals, Cadmium, Chromium, Copper and Lead, were performed at the Institute of Applied Nuclear Physics, University of Tirana, using Graphite Furnace Atomic Absorption Spectrometry. The current study reports the presence of heavy metals Cd, Cr, Cu and Pb in selected samples. Their concentrations are resulted to be quite low. Average concentrations of metals in the surface water samples were: Pb-2.14μg/L; Cd-...

Introduction: The arrival of toxic metals by human activities has lead to the contamination of soil. Heavy metals are among the most important pollutants in the environment. This study aimed at determining the concentration of heavy metals in, soils, water and vegetables of Shhnama region in Shahroud. Methods: Vegetables studied included parsley, leek, leaf beet, fenugreek, cress, basil, radish and the coriander. The sampling was performed during 3 months, from September to October, 2008. The collected 180 samples of vegetables, water, soil, after preparation by atomic absorption Spectrophotom...

An arsenic hyperaccumulator, a fern species of the Pteris genus in hydroponic systems, may be more efficient to remove arsenic from contaminated water.

The authors found that some of the sachet water samples sold in Eastern Nigeria contain heavy metals, and consumers may be exposed to hazards.