Profil Suhu, Oksigen Terlarut, dan pH Secara Vertikal Selama 24 Jam di Danau Kelapa Gading Kabupaten Asahan Sumatera Utara

Abstract

Lake Kelapa Gading is an artificial lake located in Asahan district of North Sumatra province. The purpose of this study was to determine: 1) description of conditions of temperature, dissolved oxygen and pH vertically in the water for 24 hours, 2) production and consumption of oxygen in the waters of Lake Kelapa Gading. The study was conducted in March-April 2016 with preliminary and main research activities. There are three observation stations are stations 1 (near KJA), station 2 (the area near the settlement) and station 3 (outlet). The measured temperature ranges from 30-35 ºC. dissolved oxygen highest in the surface waters of 5.12 mg / l during the afternoon and the lowest occurred at a depth of compensation of 0.64 mg / l when the weather is rainy. The measured pH value ranging between 6-9. In general there is a decrease in temperature, dissolved oxygen, and pH with increasing depth. The highest percent saturation of 71.30 % in the surface waters. Comparison between photosynthesis to respiration indicates that there has been a deficit in respiration is greater than the value of photosynthesis. dissolved oxygen concentration has reached a deficit at a depth of 36.5 cm to reach at night. Keywords: dissolved oxygen, lake, pH, saturation, temperature.