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Information Seminar Paper

Title

EXTRACTION AND DETERMINATION OF NITRITE BY HOLLOW FIBER BASED LIQUID-LIQUID-LIQUID MICROEXTRACTION FOLLOWED BY FLOW INJECTION ANALYSIS AND SPECTROPHOTOMETRIC DETECTION

Pages

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Abstract

 HIGH CONCENTRATION OF NITRITE IN DRINKING WATER, RIVERS AND LAKES IS A CRITICAL HAZARD TO HUMAN HEALTH AND ENVIRONMENT. NITRITE MOSTLY USES AS PRESERVATIVES. IRREVERSIBLE REACTION OF NITRITE WITH HEMOGLOBIN, MAY CAUSES METHEMOGLOBIN DISEASE, WHICH LEADS TO REDUCE THE BLOOD CAPACITY OF OXYGEN TRANSPORTING. NITRITE ALSO CAN HARM THE NERVOUS SYSTEM. SO DETERMINATION OF NITRITE IS VERY IMPORTANT DUE TO IT'S HARMFUL EFFECTS ON HUMAN HEALTH. IN THIS CASE A FAST, SENSITIVE, SELECTIVE, AND INEXPENSIVE METHOD IS REQUIRED FOR DETERMINATION OF NITRITE [1-2].HOLLOW FIBER BASED LIQUID-LIQUID-LIQUID MICROEXTRACTION (HF-LLLME) FOLLOWED BY FLOW INJECTION ANALYSIS AND SPECTROPHOTOMETRIC DETECTION WAS USED AS A SIMPLE AND SENSITIVE METHOD FOR DETERMINATION OF NITRITE IN WATER AND FOOD SAMPLES. THE EXTRACTION OF NITRITE WAS CARRIED OUT BY USING ISOAMYL BENZOATE CONTAINING 4% SURFACTANT AS THE ORGANIC PHASE FOR FILLING THE PORES OF THE HOLLOW FIBER, AND 0.25 M NAI SOLUTION AS ACCEPTOR PHASE IN THE LUMEN OF THE FIBER. AFTER THAT, EXTRACTED NITRITE WAS REACTED WITH SULFANILIC ACID AND PHENOL TO FORM AN AZO DYE, SHOWING A MAXIMUM ABSORPTION AT 440 NM. THE FACTORS AFFECTING THE HF-LLLME, INCLUDING TYPE OF ORGANIC SOLVENT, CONCENTRATION OF SURFACTANT, TYPE AND CONCENTRATION OF ACCEPTOR, EXTRACTION TIME AND STIRRING RATE WERE INVESTIGATED. MOREOVER, THE INTERFERENCE OF SOME ANIONS AND CATIONS IN DETERMINATION OF NITRITE WERE ALSO STUDIED. THE ENRICHMENT FACTOR, LINEAR RANG AND THE LIMIT OF DETECTION WERE OBTAINED 75, 2-500 AND 0.6 MG/L, RESPECTIVELY FOR 4 ML OF SAMPLE SOLUTION. THE METHOD WAS APPLIED FOR THE DETERMINATION OF NITRITE IN VARIOUS WATER AND FOOD SAMPLES SUCH AS POTATO AND SAUSAGE.

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