DICHLORODIPHENYLTRICHLOROETHANE (DDT) IS AN ORGANOCHLORINE PESTICIDE THAT HAS BEEN USED THROUGHOUT THE WORLD FOR THE CONTROL OF SOIL-DWELLING INSECTS AND AS A TREATMENT AGAINST DISEASES SUCH AS MALARIA AND TYPHUS. IN THE ENVIRONMENT, DDT PRODUCES TWO DEGRADATION PRODUCTS, 1, 1-DICHLORO-2, 2-BIS- (P-CHLOROPHENYL) -ETHANE (DDD) AND 1, 1-DICHLORO-2, 2-BIS- (PCHLOROPHENYL) -ETHYLENE (DDE) THROUGH TWO DEGRADATION PATHWAYS [1]. DDT AND ITS DEGRADATION PRODUCTS CAUSE SEVERAL HARMFUL EFFECTS ON HUMANS AND WILDLIFE BECAUSE OF THEIR ACTION AS ENDOCRINE DISRUPTERS BY INTERFERING WITH HORMONAL ACTIVITY [2]. THIS STUDY IS FOCUSED ON USING ION MOBILITY SPECTROMETRY (IMS) TECHNIQUE WITH CORONA DISCHARGE IONIZATION SOURCE AS A RAPID, SIMPLE AND SENSITIVE METHOD FOR DETERMINATION OF DDT AND ITS MAIN METABOLITES IN ENVIRONMENTAL WATER. THIS TECHNIQUE IS BASED ON ION MOBILITY WHICH IS PROPORTIONAL TO THE MOLECULAR WEIGHT AND CHARGE [3]. PARAMETERS INFLUENCING DETECTION AND DETERMINATION EFFICIENCY SUCH AS, INJECTION AND OVEN TEMPERATURE, FLOW RATE OF GASES AND ALSO CORONA AND DRIFT VOLTAGES, WERE THOROUGHLY OPTIMIZED. THIS DEVELOPED METHOD SHOWED GOOD RESULT FOR DETERMINATION OF DDT AND ITS METABOLITES IN LOW LEVELS (UNDERMG/L). THE PROPOSED METHOD WAS VALIDATED WITH ENVIRONMENTAL WATER SAMPLES. THE SPIKED RECOVERY WAS BETWEEN 93-98 % FOR AGRICULTURAL-FIELD WATER. THE ESTABLISHED METHOD HAS BEEN PROVED TO BE A SIMPLE, RAPID, SENSITIVE, INEXPENSIVE AND ECO-FRIENDLY PROCEDURE FOR THE DETERMINATION OF DDT AND ITS MAIN METABOLITES IN ENVIRONMENTAL WATER SAMPLES.

Cyanide is used by the mining industries in tremendous quantities, without considering most environmental. The use of cyanide compounds in mining is one of the most important environmental issues due to the acutely toxic properties of many cyanide compounds to humans and acute life. Cyanide readily combines with most major and trace metals, a property that makes it useful in metals extracting from ores. Cyanide also tends to react with most other chemical elements, producing a wide variety of toxic, cyanide-related compounds. Cyanide is a carbon based-an organic compound. it reacts readily with other carbon-based matters, including living organisms. This research atemptes to at investigate a feasible and economical technique for the removal of cyanide from tailing wastewater at Muteh gold mine factory.Cyanide removal from Muteh factory’s waste water, was achieved at the Tarbiat Modares University’s mineral processing laboratory using cyanide oxidation by HYDROGEN PEROXIDE and using a catalyst, such as copper sulfate. Hence, cyanide oxidizes and changes to cyanate (CNO-) which its environmental hazards are 1000 times less than cyanide. The optimum dose of HYDROGEN PEROXIDE for complete cyanide removal in the presence of 30 mg/lit copper sulfate (as catalyst), was 9.98gr/lit and optimum pH was determined (9.7). at high temperatures (temperatures more than 35oC), cyanide removes perfectly (at constant pH=9.7) which is mainly due to cyanide evaporation in form of HCN. Cyanide concentration in Muteh’s wastewater was determined by Rhodanine indicator solution regarding the standard titration method.

FORMALDOXIME, IS THE SIMPLEST MEMBER OF THE OXIMES FAMILY, AN IMPORTANT BIOLOGICAL AND CHEMICAL GROUP OF COMPOUNDS. FORMALDOXIME IN THE CONDENSED PHASE IS READILY TRANSFORMED INTO A SOLID POLYMER (CH2NOH) 3. IN THE ABSENCE OF WATER IT FORMS SALTS WITH ACIDS OF THE TYPE (CH2NOH) 3HCL THAT AFTER HEATING RELEASE MONOMERIC FORMALDOXIME. THE R1R2C=NOH GROUP, CHARACTERISTIC FOR OXIMES, HAS THREE DISTINCT HYDROGEN BONDING SITES AND, SO, OXIMES CAN FORM A VARIETY OF HYDROGEN BONDS. TWO OF THE THREE SITES, THE NITROGEN AND OXYGEN ATOMS, ARE THE HYDROGEN BOND ACCEPTOR SITES AND THE (N) OH GROUP IS A PROTON DONOR. ALTHOUGH THE INTERMOLECULAR HYDROGEN BOND MOTIFS INVOLVING OXIMES PLAY AN IMPORTANT ROLE IN MOLECULAR DESIGN THE HYDROGEN BONDING ABILITIES OF OXIMES WERE MUCH LESS STUDIED. IN THE PRESENT WORK, WE INVESTIGATED THE HYDROGEN BONDING INTERACTION BETWEEN H2O2 AND FORMALDOXIME. HYDROGEN PEROXIDE IS AN UBIQUITOUS MOLECULE AND WELL-KNOWN FOR ITS BACTERICIDAL AND OXIDIZING PROPERTIES. IT PLAYS SIGNIFICANT ROLES IN BIOLOGICAL AND CHEMICAL PROCESSES.