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INTRODUCTION: Phosphorus Occurs in natural waste water almost soley as phosphate. These are classified as orthophosphate condensed phosphate organically bound phosphate are applied as fertillizer to agricultural residential cultivated land are carried out to ground waters. This forms of phosphate arise from variety of sources. This occurs in solution in particle or detriters or in bodies of in aquatic organism. Phosphorus is essential for growth of organism and can be nutrient that limits the primary productivity of body of water in instancy where phosphorus broth liniting nutrient or treated or treated water. Agricultural orannage certain industrial waste water. Test immunate photo lequane micro, macro organism in new senic quantity. Phosphate occurs in bottom sediment in biological sludge and both precipitated in organic forms incorporated into organic compound. TYPE OF METHOD A. DIGESTION METHOD   1. Perchlorate acid digestion.   2. Sulfuric acid, nitric acid

INTRODUCTION: Nitrite is an intermediate oxidation state of nitrogen both in the oxidation of ammonia to nitrate & in the reduction of nitrate. Such oxidation & reduction may occur in waste water treatment, water distribution system & natural water. Nitrite can enter a supply system through it use as a corrosion inhibitor in industrial process water. Nitrite is the actual etiological agent at methemoglobimia. Nitrous acid which is formed from nitrite in acidic solution can react with nitro samines , many of which are known to be carcinogens . PRINCIPLE: Nitrite is determined through formation of reddish purple azo dye produced at pH 2.0 to 2.5 by coupling diazotize sulphanilamine with N’ (1- napthyl) ethyl diamine dihydrochloride (NED). The applicable range of the method for photometric measurement is 10-10,000 micro gram NO2/l. Photometric measurement can be made in the range 5 to 50 µg N2/l, if a 5cm light path & a green color filter are used. High