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          An acid is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger, and turn blue litmus paper red. Chemicals or substances having the property...

          Last Updated - 25th Jul, 2011

          Alachlor (CAS No. 15972-60-8) is a pre- and post-emergence herbicide used to control annual grasses and many broad-leaved weeds in maize and a number of other crops.It is lost from soil mainly through volatilization, photodegradation and biodegradation.Many alachlor degradation products have been identified in soil.

          Last Updated - 25th Jul, 2011

          The pH level of your drinking water is a measure of how acidic or basic it is – pH is related to the hydrogen ions in water and stands for “potential of hydrogen.”Alkalinity is a measure of the capacity of water to neutralize acids. It measures the presence of carbon dioxide, bicarbonate, carbonate, and hydroxi...

          Last Updated - 25th Jul, 2011

          Aluminium is the most abundant metallic element and constitutes about 8% of the Earth'scrust. It occurs naturally in the environment as silicates, oxides, and hydroxides, combinedwith other elements, such as sodium and fluoride, and as complexes with organic matter. Use of aluminium salts as coagulants in water treatment may lead to increased conce...

          Last Updated - 25th Jul, 2011

          Amines are organic compounds that contain nitrogen and are bases. Amines are basic compounds with strong odors. The odor of amines is often described as "fishy" since the odor of raw fish comes from the amines contained. Sometimes even "foul smelling" is an understatement, and two of the amines produced in decaying flesh have suggestive names (cada...

          Last Updated - 25th Jul, 2011

          The term ammonia includes the non-ionized (NH3) and ionized (NH4+) species.Ammonia in the environment originates from metabolic, agricultural and industrial processes and from disinfection with chloramine. Natural levels in groundwater and surface water are usually below 0.2 mg/litre. Anaerobic groundwaters may contain up to 3mg/litr...

          Last Updated - 25th Jul, 2011

          Ammonia is un-ionized, and has the formula NH3. Ammonium is ionized, and has the formula NH4+. The major factor that determines the proportion of ammonia or ammonium in water is water pH. The activity of ammonia also is influenced by temperature and ionic strength. This is important as the unionized NH3 is the form that can be toxic to aquatic orga...

          Last Updated - 25th Jul, 2011

          Elemental antimony forms very hard alloys with copper, lead and tin. Antimony compounds have various therapeutic uses. Antimony was considered as a possible replacement for lead in solders, but there is no evidence of any significant contribution to drinking-water concentrations from this source. Daily oral uptake of antimony ap...

          Last Updated - 25th Jul, 2011

          Arsenic is widely distributed throughout the Earth’s crust, most often as arsenic sulfide or as metal arsenates and arsenides. Arsenicals are used commercially and industrially, primarily as alloying agents in the manufacture of transistors, lasers and semiconductors.Arsenic is introduced into drinking-water sources primarily throug...

          Last Updated - 25th Jul, 2011

          Atmospheric pressure is the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low pressure areas have less atmospheric m...

          Last Updated - 25th Jul, 2011

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