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Articles by Harmin Sulistiyaning Titah
Total Records ( 2 ) for Harmin Sulistiyaning Titah
  Herman Pratikno and Harmin Sulistiyaning Titah
  Background: Corrosion is the phenomena on the offshore structures which is impossible to be avoided. Corrosion is occurred by physical, chemical and biological process. Generally, biological corrosion is caused by presence of microbes, which on its process can be individual or make a new colony with other bacteria. Methodology: This study were to determine the corrosion rate on 2 types of steel structures (ASTM A106 and A53) in deep seawater (salinity of 33‰), medium seawater (salinity of 35‰), shallow seawater (salinity of 37‰) and to determine bio-corrosion rate was caused by 3 species of bacteria Escherichia coli, Pseudomonas fluorescens and Thiobacillus ferrooxidans in three salinity (33, 35 and 37‰). Results: The results showed maximum corrosion rate, without bacteria of ASTM A106 and ASTM A53 at day 10 in salinity of 33‰ were 0.5797 and 0.6173 mm year–1, respectively. It indicating that ASTM A106 had a better corrosion resistance level compared with ASTM A53 in marine environment. The T. ferrooxidans caused the highest bio-corrosion rate (1.3212 mm year–1) in salinity of 33‰ compared with bio-corrosion rate by E. coli and P. fluorescens on ASTM A53. Meanwhile, the maximum bio-corrosion rate by T. ferrooxidans on ASTM A106 was 1.253 mm year–1. Conclusion: The bio-corrosion rate on ASTM A53 increased by two-fold compared with the condition without bacteria addition (corrosion rate of 0.6173 mm year–1).
  Harmin Sulistiyaning Titah , Siti Rozaimah Sheikh Abdullah , Mushrifah Idris , Nurina Anuar , Hassan Basri and Muhammad Mukhlisin
  Studies were conducted to determine the range of arsenic concentration through a phytotoxicity test on the plant species of Ludwigia octovalvis. Pots contained 3 kg of sand spiked with As salt of sodium arsenate dibasic heptahydrate. Arsenate [As(V)] concentrations were set as 0 mg kg-1 as control 1 without plant, 0 mg kg-1 as control 2 with plant, 4, 20, 40, 60 and 80 mg kg-1. The experiment was carried out for 28 days. The parameters such as pH and temperature in spiked sand were also monitored. The As bioavailability in spiked sand was extracted using Na2-EDTA method and were determined using Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) Optima 7300DV. Based on the range finding test results, L. octovalvis can survive up to As(V) concentration of 40 mg kg-1, whereas the plant were wilted and dried at 60 and 80 mg kg-1. The EC50 value for single As(V) phytotoxicity to L. octovalvis was predicted between 40 and 60 mg As kg-1. Reductions of As(V) bioavailability in spiked sands were calculated as between 13.0±3.3 and 70.4±0.1%. Hence, the next step experiment on a prolonged phytotoxicity test will be based on the value of this As(V) concentration effect.
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