ปริมาณการปนเปื้อนของสารประกอบ ได-(2-เอทธิลเฮ็กซิล) ทาเลต (DEHP) ในดินตะกอนและปูทะเลบริเวณทะเลสบสงขลาตอนล่าง

Abstract

Di-(2-ethylhexyl) phthalate (DEHP) is a commonly used chemical in the plasticindustry. It is a harmful substance to the endocrine system, causing reproductive system disorders, and it is also a mutagen. Contamination of DEHP in the environment continuously occurs, especially in industrial wastewater, solid waste landfill and the community effluent. This study investigated the contamination of DEHP accumulated in sediment and mud crabs in lower Songkhla Lake, which received pollutants from branch canals that flow through many sources of pollution, in order to assess the initial risk to health, environment and ecosystems. Analyses of DEHP levels in sediment and crab samples in lower Songkhla lake were conducted using gas chromatography (GC) with a Flame ionization detector (FID). The sampling sites consisted of 8 stations near the mouth of several branch canals, including U-Taphao canal, Samrong canal, Pa-Wong canal, Pak-Ror canal, Pak-Jar canal, Phue Mee canal, and Bang-Klam canal. The average concentrations of DEHP in sediment were 18.53+0.29, 2.29±0.19, 1.87±0.11, 1.01+0.01, 0.72+0.06, 0.56±0.04, 0.52±0.05 and 0.45+0.04 mg/kg OC dry wt., respectively. The average concentrations of DEHP in mud crabs were 0.33±0.02, 0.23±0.02, 0.20±0.01, 0.17±0.01, 0.15 +0.01, 0.13 +0.01, 0.13±0.01 and 0.10+ 0.01 mg/kg dry wt. The mouth of U-Taphao canal had the highest average concentration of DEHP in sediment, but not exceeding the threshold set by the Pollution Control Department (36 mg/kg OC dry wt.). However, mud crab samples from U-Tapao canal had the highest levels of DEHP which exceeded the standard limit set by the Chinese Ministry of Health (0.3 mg/kg dry wt.). Therefore, the health risk might be significant. In order to avoid the effects of DEHP, responsible authorithies should work together to produce measures for prevention DEHP contamination.