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Journal : Seminar Nasional Teknik Kimia Kejuangan

Evolutionary Perspective of Sulfur Dynamics in Tomohon and Implications on Microbial Corrosion Frity Lisa Taroreh; Jubhar C Mangimbulude; Ferry F Karwur
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Sulfur (S) is a non-metal, multivalent, tasteless and odorless element. The vast amount of sulfur valence (from S2- to S6+)allows such element to participate in various geochemical and biochemical processes. In nature, sulfur is everywhere, abundant and distribute evenly on earth and the solar system. On ‘ancient’ earth in anoxic atmospheric condition, sulfur existed in the form of H2S. In oxic period, following the discovery of photosynthesis, sulfur was commonly found in the form of sulfur oxides (SOx). This paper discusses the evolutionary perspective of sulfur by presenting and discussing three following aspects: (i) The formation ofsulfur element through “nucleosynthesis” that generating 4 sulfur isotopes with various abundances (32S= 95.02%; 33S = 0.75%; 34S = 4.21%; 36S= 0.02%), (ii) Geological record of ∆33S and sulphate dynamics in the atmosphere since 2,500,000,000-290,000,000 years ago as volcanic gas; and, (iii) The transformation of various types of sulfur compounds in oxic condition nowadays as SO2 , SO3, H2SO4, sulfite salt, sulfate salt, and organic sulfur aerosols.Special attention is given to the sulfur cycle and changing dynamics in nature related to volcanism in geological context of North Sulawesi, especiallyTomohon areas, and practical implication of microbiological corrosion is considered as the implication of the sulphuric evolution that affect the life of modern society.
Transformasi Nitrogen secara Biologis di Air Panas Sarongsong Kota Tomohon Frity Lisa Taroreh; Ferry Karwur; Jubhar Mangimbulude
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Nitrogen transformation is the alteration process of nitrogen compounds from one form to another occurred in the nature. The transformation can even occur in an extreme environment, such a hot springs, and get through processes, including amonification, nitrification and denitrification. The research objective was to determine the hydrochemicals/ characteristics of water physically and chemically, as well as to determine whether nitrogen transformation occured through the processes of amonification, nitrogen, nitrification and denitrification in Sarongsong hot spring. Samples in the research were taken from Sarongsong Hot spring, Tomohon City at three different stations and were grouped in two: aerobic and anaerobic. This research was undertaken in CARC laboratory, master’s program of biology, SWCU, Salatiga. The level of ammonium, nitrite and nitrate at three stations (S1, S2, S3) at early period of the research were measured. Levels of ammonium, nitrite, and nitrate at S1 respectively are: 4.85mg/ L; 0.00mg/ L; 0.00mg/ L; at S2: 2.45mg/ L; 0.00mg/ L; 0.00mg/ L; on S3: 4.37mg/ L; 0.00mg/ L; 0.00mg / L. following 7 days of treatment, levels of ammonium, nitrite and nitrate in S1, S2, S3 at the condition of the aerobic and anaerobic has altered in concentration, that  is an indication of nitrogen transformation process (amonification process) in Sarongsong hot spring, Tomohon City.