Summary of dissertation Environmental engineering: Concentrative assessment of organic chlorine pesticides in water, sediments, aquatic organisms at the Saigon – Dong Nai River estuary and testing the toxicity of DDTs on embryos and larvae of Pacific oysters, Fish Medaka

The objective of the dissertation is to determine the residue of pesticides OCPs in water, sediments, aquatic organisms at the estuary of the Saigon – Dong Nai and to evaluate the toxicity of the pesticides DDTs on the embryos and larvae of the Pacific oysters (Crassostrea Gigas), Fish Medaka (Oryzias latipes).
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Summary of dissertation Environmental engineering: Concentrative assessment of organic chlorine pesticides in water, sediments, aquatic organisms at the Saigon – Dong Nai River estuary and testing the toxicity of DDTs on embryos and larvae of Pacific oysters, Fish MedakaMINISTRY OF EDUCATION AND TRAINING VIETNAM ACADEMY OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ----------------------------- Nguyen Xuan TongASSESSMENT OF ORGANIC CHLORINE PESTICIDES IN WATER, SEDIMENTS, AQUATIC ORGANISMS AT SAI GON-DONG NAI RIVER ESTUARY AND TESTING THE TOXICITY OF DDTs ON EMBRYOS AND LARVAE OF PACIFIC OYSTERS, FISH MEDAKA Major: Environmental Engineering Code: 9 52 03 20 SUMMARY OF DISSERTATION Hanoi – 2021The dissertation was implemented at: Graduate University of Science and Technology -Vietnam Academy of Science and Technology.The first supervisor: Dr. Mai HuongThe second supervisor: Assoc. Prof. Dr. Duong Thi ThuyReviewer 1: …Reviewer 2: …Reviewer 3: ….The thesis will be defended at the Academy-level Ph.D. Thesis Evaluation Council, GraduateUniversity of Science and Technology - Vietnam Academy of Science and Technology ….Stored by:- Library of Vietnam Academy of Science and Technology- National Library of Vietnam 1 INTRODUCTION 1. The necessary of the dissertationOrganic component pesticides (OCPs) have been widely used around the world over the past centuries tocontrol pests, fungi, and various insects to increase productivity, protect public health, and preventmosquitoes that cause malaria. However, OCPs were banned or restricted from use globally several decadesago due to their toxicity to living organisms.Recently, rapidly growing industrial zones and urban areas can be potential sources of OCPs. The illegaluses of OCPs upstream have also caused the rise of OCPs concentrations in surface water and sediment indownstream areas of the Saigon – Dong Nai River. Thus, studies on OCPs in surface water, sediment, andestuarine species are really important. Therefore, the current thesis “Concentrative assessment of organicchlorine pesticides in water, sediments, aquatic organisms at the Saigon – Dong Nai River estuary andtesting the toxicity of DDTs on embryos and larvae of Pacific oysters, Fish Medaka” was conducted from2017 to 2018. 2. The objectives of the dissertationThe objective of the dissertation is to determine the residue of pesticides OCPs in water, sediments, aquaticorganisms at the estuary of the Saigon – Dong Nai and to evaluate the toxicity of the pesticides DDTs on theembryos and larvae of the Pacific oysters (Crassostrea Gigas), Fish Medaka (Oryzias latipes). 3. The main research contents of the dissertationTo survey the current state of OCPs in water, sediments in the Saigon – Dong Nai estuary according toseasons and pollution groups.To investigate the current status of pesticide pollution of OCPs for fish, bivalve molluscs and to determinethe source of pollution at the Saigon – Dong Nai river estuary.To evaluate the toxicity of the insecticide DDTs on the growth of Pacific oysters (Crassostrea Gigas) andFish Medaka (Oryzias latipes) through the determination of LC50/EC50 and assessment of the effects onembryonic and larval morphology. CHAPTER 1: OVERVIEW1.1. Overview on pesticides1.2. Research situation and the state of pesticide residues in aquatic ecological environment1.3. Overview on Pacific oysters (Crassostrea Gigas), Fish Medaka (Oryzias latipes) and theirapplications in ecological toxicity assessment1.4. Overview on the study areas CHAPTER 2: RESEARCH METHODS2.1. Chemicals, instruments, and laboratory equipment2.2. Sampling location2.3. Sampling methods2.4. Sample analysis method2.4.1. Analysis of physical and chemical parametersTable 2. 1. Technical analysis of physical and chemical parameters of surface water and sediment samplesMatrix Physical and chemical parameters Technical analysis pH, Electrical Conductivity (EC), Total Hydrolab Model (Multi Set 430iWTW)Water Dissolved Solids (TDS), Temperature Turbidity Secchi plate (30 cm diameter) 2 Shaking 10 g of dry sediment in 25 mL of ...