Behavior Of Triazophos In Ocean Circumstance

Triazophos has been widely used in sea shellfish aquaculture recent years to clear away harmful organisms.The effect of use triazophos is very perfect on increasing the yield of sea shellfish.But triazophos is high-toxic to some marine organism, and can even cause death of marine organisms including fish and shrimp in the neighborhood marine area, resulting in obvious financial loss in fishery economy.It also causes contradiction among the fishermen, bringing facts of disharmony and unsteadiness to the development of our society. The use of triazophos influences the quality and edible safety of farming mollusks either. Therefore, it is very important and necessary to investigate the behavior of triazophos in ocean circumstance in order to provide scientific evidence for the evaluation of environmental influence during the process of triazophos usage.From the Ecotoxicology's point of view to study the toxic effect of triazophos to the environmental organisms,researchers should pay special attention to the fundermental principle of toxicity evaluation: the relationship between toxicity and the 3 kinds of mutual influence factors , namely living creature(individual or cluster), poison and time capacity. If living creature and time capacity fix, the decisive factor of the toxicity effect is the density of toxic substances. Obviously, environmental factor has significant impact on the density of toxic substances. The important environmental factors on the marine spot are: pH,ultraviolet ray,suspended substance and living creature.The varietation of pH, especially the increasing of hydroxylion, improves the hydrolysis of the triazophos and decreases its concentration,the ultraviolet ray has enough energy so as to induce chemical changes of organophosphorus pesticides.This text through research sea water the spot of pH condition, dissimilarity sediment density and existence organism of hour to triazophos of possibility influence, pass triazophos in the sea water, the sediment, organism of decline solution experiment, carry on study in the behavior in the ocean environment to triazophos, first step understanding triazophos are in the natural environment existence of appearance.This experiment mainly adopts static equilibrium method to measure the concentration of triazophos in water according the variation of the time.Since the determination of trace triazohpos residue in sediment is especially difficult, we acquire the residue quantity by subtract the residue in water from the initial addition. Biological experiment uses marine mollusk tegillarca granosa and Sinonovacula constricta of different habitats to carry on the accumulation and digestion experiment. The trazophos residue in water is measured by GC with a NPD, the result shows that the half-life of triazophos in natural sea water is 4.8 days, while the half-life of trazophos in sea water filtrated by millipore membrane is about10 days. Obviously,the difference in measuring half-life of triazophos in natural and filtrated sea water is probably influenced by the suspended substances and the algae. The loss of triazophos in the sediments is not obvious for the process of absorption and analysis is reversible. Afer giving medicine 24 hours later, the concentration of triazophos increases rapidly in the bloody clam and the razor clam body density ascension, respectively is 0.42mg/kg and 2.97mg/kg. The elimination speed of triazophos in the bloody clam is comparatively slower, in the 10 d the triazophos in the body declines to 0.14 mg/kg, the elimination speed of triazophos within razor clam is relatively more quick, 100 h later the triazophos in the body declines to the level of 0.021 mg/kg. Bloody clam and razor clam density - time cancellation curve square distance respectively is y=1.549e-0.345t and y=1.667e-1.336t, The half- life of twos is 2.1d and 3.0d,T0.01 is 17.8d and 4.7d.The concentration-time capacity curve equation of bloody clam and razor clam is y=1.549e^-0.345t and y=1.667e^-1.336trespectively,and the half- life is 2.1d and 3.0d,T0.01 is 17.8d and 4.7d.