Top Research Papers on Heavy Metals in Water

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 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...

Current knowledge of the chemistry of zinc, copper, and gold is reviewed and metallothionines, present in all tissues, could be regulated by trace amounts of metal ions, and this in turn might explain the mode of action of metal containing drugs.

The outcome of undergoing genetic engineering investigation concerning plants applicable in phytoremediation may also lead to a better understanding of metal metabolism in plants, which can result in important contributions for the implementation of phytorenmediation as a feasible soil remediation technology.

This thesis describes chosen heavy metals which are toxic for human body, characteristic symptoms of chosen metal intoxication types and prevention methods, and examples of the influence of lead on central nervous system, on anomalies in fetal nervous system development and tobacco smoke toxins on fetal development during pregnancy.

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.

IN ROAD LANDSCAPE ENGINEERING SYSTEMS The heavy metals content in the soil was investigated within the road landscape engineering system of Kyiv – Odesa. The heavy metals as Cu, Zn, Pb and Cd of the first and second classes of danger were detected. Four full-size areas for research were selected: the first one is near the town of Bila Tserkva (Kyiv region), the second one is located near the village of Nesterivka (Cherkasy region), the third part of the study is near the village of Pikivets (Cherkasy region), the fourth - near the city of Uman on the fork “clover leaf” (Cherkasy region). It is...

The global concern of heavy metal toxicity has affected all nations, as the discharge of agricultural runoff and untreated industrial waste into water bodies, including rivers, leads to environmental toxicology. This increased level of heavy metals poses risks not only for marine life but also to those who consume them. While fish is an important protein source, consuming contaminated fish containing high levels of heavy metals can have severe adverse effects on human health. Therefore, it is crucial to address these pollution sources effectively in Pakistan, where a significant portion of the...

Heavy metals cause various health hazards. Using lactic acid bacteria (LAB), we tested the reduction of heavy metals e.g. chromium (Cr), lead (Pb) and copper (Cu). The metals levels sorption were tested in two bacterial strains (Lactobacillus plantarum and Lactobacillus rhamnosus) using atomic absorption spectrophotometery Flame Atomic Absorption Spectrometry (FAAS) by AA-7000 Shimadzu, the cell turbidity was (1×10 cells/ml). The results showed decreased in all metals levels (Pb, Cu and Cr ) in MRS broth. The Cr concentrations of the media in the pre-Lactic acid bacteria treatment s (25.39) mg...

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).

A method for processing waste water containing heavy metal and sulphate ions, wherein the metal ion is first precipitated and separated in the form of a sulfide, then Biological reduction of sulfate to sulfide, and sulfide precipitation step is returned in. Residual sulphide can be oxidized to elemental sulfur, elemental sulfur is separated off prepared desulfurization waste water, or to remove the residual sulphide by adding a metal salt before the precipitation.

Disclosed are methods and apparatuses for producing heavy water. In one embodiment, a catalyst is treated with high purity air or a mixture of gaseous nitrogen and oxygen with gaseous deuterium all together flowing over the catalyst to produce the heavy water. In an alternate embodiment, the deuterium is combusted to form the heavy water. In an alternate embodiment, gaseous deuterium and gaseous oxygen is flowed into a fuel cell to produce the heavy water. In various embodiments, the deuterium may be produced by a thermal decomposition and distillation process that involves heating solid lithi...

Engineering details of the Spevack process for the production of heavy water by dual temperature exchange using hydrogen sulfide are reported. Schematic flow diagrams showing pracipal towers and liquid flow paths are given for the Savannah and Dana Plants. Carbon steel is corroded by H2S la water, but the iron sulfide that is fomned acts as a protective coating. Although corrosion is very rapid at first, it drops to a rate so low as to be negligible after about 1000 hr. Various measures are discussed which reduce this corrosion even farther. Dump valves connected to a 400 ft stack for burning ...

Although heavy metal ions are naturally present in the environment, their concentrations have significantly increased due to industrial activities [...].

Catalysts using suitably supported platinum show promise for the commercial production of heavy water. Carbons are potential primary supports for the platinum and metal-support interactions have been observed in this system. These interactions lower the chemical activation energy and increase the rate of reaction under conditions where it seems likely that the support donates electrons to the metal.

I asked this question of my introductory chemistry teacher over 50 years ago. He replied rather hesitantly, "A metal that behaves in a heavy metal manner." A vague term requires a vague definition, but just what is a "heavy metal manner"?In my day job I routinely conducted a test for heavy metals, which was and is described (1) as a test for "metallic impurities that are colored by sulfide ion". It may mean different things to different people, but as I have used, heard, and interpreted the term over the last half-century it refers to metals with insoluble sulfides and hydroxides, whose salts ...

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...

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...

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...

GENERAL PRINCIPLES. Soil Processes and the Behavior of Metals (B. Alloway). The Origins of Heavy Metals in Soils (B. Alloway). Methods of Analysis for Heavy Metals in Soils (A. Ure). INDIVIDUAL ELEMENTS. Arsenic (P. O'Neill). Cadmium (B. Alloway). Chromium and Nickel (S. McGrath & S. Smith). Copper (D. Baker). Lead (B. Davies). Manganese and Cobalt (K. Smith). Mercury (E. Steinnes). Selenium (R. Neal). Zinc (L. Kiekens). Other Metals and Metalloids (K. Jones, et al.). Appendices. Index.