However, nitrogen is not only associated with gas. Nitrogen turns to a liquid state when exposed to extremely low temperature (-210 C). Liquid nitrogen has a density of 0.807 g/ml. Nitrogen is widely used in the chemical industry as well as in our everyday daily lives. In the chemical industry, nitrogen is needed to make fertilizers, nitric acid, nylon, dyes and explosives.
. Nickel Nickel contains of combination with sulfur and iron ores . this metal are recent and have led to introduction of nickel in steel manufacturing , coin production and electro plating of metal object Biological activity of nickel it has an impotent role in microorganisms and plants . nickel presence in many enzymes can be considered as essential trace element , although some health authorities question this assumption Human exposure nickel has concentrations range from 4 to 80 ppm in soil vary according to geology input . it has concentrations in rivers and lakes range from 0.5 to 6 µg\L .
It is either consumed in supplementary form or indirectly through diet. The most common forms of selenium in dietary supplements include selenomethionine, selenocysteine and selenite. The influence of chemicals on the cultivation land determines the amount of selenium in the soil, which indirectly determines the amount of selenium entering our body system. The plants convert inorganic forms of selenium to organic making it available for humans. The selenium content of plant foods varies from one country to another and also shows regional variation.
High level of radon in domestic water might also give high exposure through the intake of water taken directly from the tap but the dose and risk in this case may be small compared to the inhalation (WHO Regional Office for Europe, Copenhagen, Denmark, 2001). Radon can dissolves in water, but is easily removed when water is heated or uses for other purposes. Ingestion also routes that contribute to exposure by food that is contain radium and long-lived radon progeny (WHO Regional Office for Europe, Copenhagen, Denmark, 2001). In indoor air, radon produces a series of short-decay that may attach to aerosol particles present in the air or deposit on the room surfaces (Quindos, L.S. et al.,1991).
This is important because citrate ions complex iron and inhibit the formation of an oxalate precipitate. The formation of a precipitate film could interfere with subsequent exams. Ferric nitrate, ferric sulphate and diethylthiourea are often used as corrosion inhibitors to prevent pitting of carbon steel surfaces. CITROX is usually applied for eight hours at 80 oC. Despite of many good results obtained with CITROX processes, a replacement for this process has been studied especially in Czech Republic and Slovakia.
Combination of antioxidants is useful for the treatment of toxicity from cadmium in intestine. INTRODUCTION: Cadmium is very toxic heavy metal and have adverse effect on human body it disturb enzymatic activities of cell , tissues and metabolic processes of human body(Irfan et al., 2013).it was first discovered in 1817. It is noncorrosive so it is use in electroplating and galvanizing.it use
Mercury in Fish Mercury, Despite the fact that it is highly toxic, it has been used in widely around the world in situations such as extracting gold and in products such as thermometers. Although the world is working hard to cut down mercury, it remains as a major problem. (Royal Society of Chemistry N.D.) Mercury is an artificial chemical element, a metal created by human beings. It was originally introduced by Spain and was then widely used around the world to extract gold. In modern days, China and Kyrgyzstan produce the most amount of mercury in the world through serving as catalysts in chemical industries and being used in electrical switches and rectifiers.
English scientist Sir William Crookes discovered thallium in 1861. Atomic number for thallium 81g, atomic weight 204.383g . him The melting temperature of 303.5 °C, while boils at a temperature of 1457 ° C. And its density is 11.85 g / cm² at 20 ° C class The metal thallium is highly toxic to humans. As the feature is a cumulative effect, it increases with the passage of time. And exposure to a lot of this element may cause some diseases and suspected thallium potential carcinogenic to humans.
bedrock and soil. Chromium weathered from the rocks is deposited on the soil and groundwater. Chromium is also generated anthropogenically from various industrial processes which includes electroplating, leather tanning, wood preservations, manufacturing of dye, paint, paper, petroleum refining processes, metal finishing, alloysteel manufacturing, and lasers(Owlad et al., 2010). According to BIS (Bureau of Indian Standards) and USEPA the maximum acceptable limit for Cr(VI) in drinking water is 0.05 mg/L and total chromium (Cr(VI) and Cr(III)) is 2 mg/L(Jain et al., 2010). Various conventional techniques have been employed for the removal of chromium from water which includes Reverse osmosis, Chemical precipitation, Filtration, Ion exchange,
Nickel Basic Information: -Symbol = Ni -Atomic Number = 28 -Atomic Mass = 58.69789 -Isotopes: -58(68.27 percent) -60(26.10 percent) -Group Name = Transition Metals -Group = 10 -Electron Configuration = 1s2 2s2 3s2 3p6 4s2 3d8 Physical Properties: Nickel is a silvery, lustrous white metal that is very tough ( it is even harder than iron) and has a shiny polish on top. It can conduct electricity, and its melting point is 1455 degrees celsius and its boiling point is 2913 degrees celsius. Also, the density of this metal is 8.9 g/cm3 and at room temperature, this metal is a solid . Nickel is also extremely ductile because you can create 300 km worth of wire from just one kilogram of nickel. The reason why it is so ductile is