Analytical study on insecticides and fungicides in fresh water fish ecosystem of gomti river

Abstract

ABSTRACT newline Streams with urban or agricultural influences within the watershed often contain pesticide combinations. By integrating measurements of pesticide exposure and acute toxicity in an additive toxic-unit model, the Pesticide Toxicity Index (PTI) is a screening method to evaluate the possible aquatic toxicity of complex pesticide mixes. Fish, cladocerans, and benthic invertebrates each have their own PTI. In addition to adding two forms of PTI for usage in various applications based on research goals, this study increases the number of pesticides and degradates included in earlier versions of the PTI from 124 to 492. The Median PTI is suitable for assessing relative potential toxicity across samples, locations, or pesticides since it was computed using the median toxicity values for each pesticide, making it resilient against outliers. The Sensitive-PTI is a more sensitive screening-level indication of possible toxicity as it employs the fifth percentile of known toxicity values. Data collected from published field experiments that assessed pesticide concentrations and toxicity to Ceriodaphniadubia in ambient stream water were used to evaluate PTI predictions of toxicity in environmental samples. In 44% of samples with median PTI values between 0.1 and 1, C. dubia survival was lowered to less than 50% of controls, and in 96% of samples with median PTI values of N1, it was lowered to 0%. The PTI is a quantitative, relative measure of possible toxicity that may be used to assess the connections between biological state and pesticide exposure. newline Four stations have been chosen based on reports of heavy metal concentrations, namely Zn, Cu, Fe, Cd, and Ni, in the Gomti river that flows beside the city of Jaunpur. Over the course of a year, samples of water, algae, and sediments from the Gomti River were analysed in order to quantify the metals. The mixing zone (S3) had the highest values, followed by S2, S4, and S1. Algal cells and sediments had greater concentrations of all metals than water. Particle size, the distribution of organic carbon, nitrogen, and extractable metals were also examined in the sediment samples. In addition to increased concentrations of each element in the sediment and water, the S3 sediment included more clay and organic debris. newline newline