• Ozone is an oxidizing agent and a germicide. It is used for oxidation of organic matter, which produces color and odor in drinking water. Ozone is used as an oxidizing agent because of its efficiency (2.07 Oxidizing Potential). Thanks to its oxidizing potential, ozone has the advantage of reducing the time normally required for sterilization. Ozone is dangerous for human health (depending on ozone concentration and time of exposure) and those plants that use this sterilizing agent (normally swimming pools, bottled water and drinking water) normally have to apply a process of de-ozonization, at the end of the sterilization process. Ozone is widely used in the process of reverse osmosis for water sterilization in bottled water plants and in the process of washing bottles before use.
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• The pH value of water is related to a large number of dissolved substances and is therefore a good indicator of the quality of water. In applications where water is treated chemically, the pH value should be measured continuously. In chemical reactions, the solids present in wastewater precipitate and the water is neutralized and decontaminated. During these reactions, the pH must be kept at the right value, since a solution that is too acid or alkaline may interfere with the precipitation of the solids and will influence the efficiency of the process. Hanna’s line of chemical test kits covers the pH range in the scales between pH 3 and 10. The colorimetric pH kits are also available with an additional reagent against chlorine interference. To order these simply add ‘/0’ to the end of the part number.
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• Phosphate is used in water treatment, heating systems and cooling systems as a corrosion inhibitor. It is also measured as a nutrient in agriculture and horticulture. High concentrations of phosphate facilitate growth of algae, built up of corrosion and can cause environmental pollution and eutrophication.
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• Phosphorus belongs to the primary macronutrient group. It is an essential element to plant growth and is needed in large amounts. Phosphorus exists in soils mainly as P. It is absorbed at the surfaces of Iron and Aluminum oxides or in association with Calcium. It also occurs in organic forms and may be released by microbial activity. It is absorbed by roots only in its maximum oxidation state as the orthophosphoric ion H2PO4 or HPO42, depending on the pH. Moreover, its absorption is most efficient for pH values between 5 and 7: this implies that acid or calcareous soil needs to be corrected to neutral pH values for better tillage yield.
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• Potassium is present in tissues responsible for the growth of plants (primary and secondary meristems). It plays an important role in how much water is absorbed by the roots and in the regulation of cellular activity. In addition, Potassium makes plants more resistant to diseases and yields a positive effect on the color and fragrance in flowers. The problem of lack of Potassium is quiet frequent in calcareous soils. The Hanna test kit determines Potassium in soil via turbidimetric method: the developed turbidity is proportional to Potassium concentration.
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• Silicon does not occur freely in nature, but rather as Silica (SiO2) in crystalline forms, combined with other oxides and metals in a variety of silicates. Silicon is usually reported as Silica when rocks, sediments, soil and water are analyzed. Silica is only slightly soluble in water; solubility and form of Silica in water depend on the pH of water and on the minerals containing Silica, in contact with the water.
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• Sodium is one of the most studied elements because of its toxic effects to soil texture and crops. High concentration of sodium disperses soil colloidal particles, rendering the soil hard and resistant to water penetration. The build-up of osmotic pressure in soil due to high sodium concentration causes difficulty in water absorption by plant roots. Plants are sensitive in varying degrees to soil salinity and when this exceeds a certain limit their growth is impaired, thus lowering their productivity. High amounts of sodium can be mitigated with distribution of gypsum directly on soil or as an additive to irrigation water. The Hanna test kit determines Sodium Hazard in irrigation water by calculation of SAR (Sodium Absorption Ratio) in relation to Calcium and Magnesium concentration. The kit is supplied with the Hanna DiST® 4 Conductivity Tester, to quickly determine the conductivity of the irrigation water. The kit's manual also supplies information about practical actions to take from the results obtained from the test.
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• Even though zinc is nontoxic to human beings, concentrations higher than 5 mg/L (ppm) can cause a bitter, astringent taste. This level of zinc can result in a milky color in alkaline water and is irritant to the human digestive system. Zinc in low quantities is a beneficial and necessary element for body growth. Zinc is normally introduced into drinking water through industrial effluents. In addition to drinking water, zinc is measured in surface finishing, boilers and cooling towers, water conditioning and effluent waters.
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