The unrevealed of water quality parameters at Lake Oemasapoka, Rote island - investigation the concentration of heavy metal in a saline environment Luki Subehi, Th Rina Mulyaningsih, Media Fitri Isma Nugraha, Atriyon Julzarika, Kayat, Imroatushshoolikhah, Yustiawati, Hanhan A. Sofiyuddin, Saeful Yusuf, Enos Tangke Arung
Research Center for Limnology and Water Resources - BRIN
Abstract
Inland water resources on Rote Island are more than 80 lakes and ponds. The inland water resource on Rote Island is a saltwater environment. One of them is Dead Sea Lake Oemasapoka. The results of previous research, Oemasapoka Dead Sea Lake showed its uniqueness in the form of high salinity values (above the average salinity of seawater, 40-42 ppt), also found fish fauna that usually live in freshwater, namely Tilapia (Oreochromis niloticus) and Fish Betok (Anabas testudineus and fish commonly found in sea or brackish water, namely glodok fish (Periophthalmus sp.). As a closed lake (no inlet and outlet), the maximum depth of the lake is 28.7 m with a lake area of 1,246.25 Ha. This study aims to reveal several water quality parameters, especially heavy metal concentrations in a saline environment. Moreover, it found that there was some fresh water (springs), salt water and water smells H2S. In order to get insight of the heavy metal parameters condition, Heavy metals in each water sample were examined using neutron activation analysis. Sample irradiation was carried out at the G.A Siwabessy Multipurpose Reactor Reactor system in Serpong, at neutral flux ron 3 x 1013 n cm-2s-1. Quantitative analysis was performed using the INAA comparison method and INAA-ko-IAEA software. The results showed the concentrations of Aluminum (Al), Chromium (Cr) and Zinc (Zn) for H2S smelling water (1.45 0.24 mg/L, 0.32 0.02 mg/L and 0.28 0 .02 mg/L) was higher. compared to fresh water as spring water (0.99 0.15 mg/L, 0.16 0.01 mg/L and 0.17 0.01 mg/L, receptively). In addition, only the concentration of Chromium (Cr) for brine was obtained (0.24 0.01 mg/L). The results show that the geological processes in this area are unique, especially related and the interactions between fresh water (springs), salt water and H2S odors should be explained in more detail with the natural conditions in Dead Sea Lake Oemasapoka.
Keywords: Dead Sea Lake Oemasapoka, Heavy metal, Aluminum, Chromium, Zinc, Rote Island
Topic: Aquatic Ecology and Conservation (International)
